fix: increase VIN decode timeout to 60s for Gemini cold start (refs #229 )

Default 10s API client timeout caused frontend "Failed to decode" errors when Gemini engine cold-starts (34s+ on first call). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
chore: change google region
2026-02-19 21:30:31 -06:00 · 2026-02-19 20:59:40 -06:00 · 2026-02-19 20:36:34 -06:00 · 2026-02-19 20:35:06 -06:00 · 2026-02-19 20:14:54 -06:00 · 2026-02-18 21:51:45 -06:00
547 changed files with 62805 additions and 3393 deletions
--- a/.ai/context.json
+++ b/.ai/context.json
@@ -1,11 +1,12 @@
 {
  "version": "6.2.0",
-  "architecture": "simplified-5-container",
+  "architecture": "9-container",
  "repository": {
    "host": "gitea",
    "owner": "egullickson",
    "repo": "motovaultpro",
-    "url": "https://git.motovaultpro.com"
+    "url": "https://git.motovaultpro.com",
+    "default_branch": "main"
  },
  "ai_quick_start": {
    "load_order": [
@@ -51,7 +52,7 @@
    "project_overview": {
      "instruction": "Start with README.md for complete architecture context",
      "files": ["README.md"],
-      "completeness": "100% - all navigation and 5-container architecture information"
+      "completeness": "100% - all navigation and 9-container architecture information"
    },
    "application_feature_work": {
      "instruction": "Load entire application feature directory (features are modules within backend)",
@@ -104,6 +105,26 @@
      "type": "cache",
      "description": "Redis cache with AOF persistence",
      "port": 6379
+    },
+    "mvp-ocr": {
+      "type": "ocr_service",
+      "description": "Python OCR service with pluggable engine abstraction (PaddleOCR PP-OCRv4 primary, optional Google Vision cloud fallback, Tesseract backward compat)",
+      "port": 8000
+    },
+    "mvp-loki": {
+      "type": "log_aggregation",
+      "description": "Grafana Loki for centralized log storage (30-day retention)",
+      "port": 3100
+    },
+    "mvp-alloy": {
+      "type": "log_collector",
+      "description": "Grafana Alloy for log collection and forwarding to Loki",
+      "port": 12345
+    },
+    "mvp-grafana": {
+      "type": "log_visualization",
+      "description": "Grafana for log querying and visualization",
+      "port": 3000
    }
  },
  "application_features": {
@@ -290,6 +311,6 @@
    "single_tenant_architecture": true,
    "simplified_deployment": true,
    "docker_first_development": true,
-    "container_count": 5
+    "container_count": 9
  }
 }
--- a/.ai/workflow-contract.json
+++ b/.ai/workflow-contract.json
@@ -40,46 +40,79 @@
      "When moving status, remove the previous status/* label first."
    ]
  },
+  "sub_issues": {
+    "when": "Multi-file features (3+ files) or features that benefit from smaller AI context windows.",
+    "parent_issue": "The original feature issue. Tracks overall status. Only the parent gets status label transitions.",
+    "sub_issue_title_format": "{type}: {summary} (#{parent_index})",
+    "sub_issue_body": "First line must be 'Relates to #{parent_index}'. Each sub-issue is a self-contained unit of work.",
+    "sub_issue_labels": "status/in-progress + same type/* as parent. Sub-issues move to in-progress as they are worked on.",
+    "sub_issue_milestone": "Same sprint milestone as parent.",
+    "rules": [
+      "ONE branch for the parent issue. Never create branches per sub-issue.",
+      "ONE PR for the parent issue. The PR closes the parent and all sub-issues.",
+      "Commits reference the specific sub-issue index they implement.",
+      "Sub-issues should be small enough to fit in a single AI context window.",
+      "Plan milestones map 1:1 to sub-issues."
+    ],
+    "examples": {
+      "parent": "#105 'feat: Add Grafana dashboards and alerting'",
+      "sub_issues": [
+        "#106 'feat: Grafana dashboard provisioning infrastructure (#105)'",
+        "#107 'feat: Application Overview Grafana dashboard (#105)'"
+      ]
+    }
+  },
  "branching": {
-    "branch_format": "issue-{index}-{slug}",
+    "branch_format": "issue-{parent_index}-{slug}",
    "target_branch": "main",
-    "example": "issue-42-add-fuel-efficiency-report"
+    "note": "Always use the parent issue index. When sub-issues exist, the branch is for the parent.",
+    "examples": [
+      "issue-42-add-fuel-efficiency-report (standalone issue)",
+      "issue-105-add-grafana-dashboards (parent issue with sub-issues #106-#111)"
+    ]
  },
  "commit_conventions": {
    "message_format": "{type}: {short summary} (refs #{index})",
    "allowed_types": ["feat", "fix", "chore", "docs", "refactor", "test"],
+    "note": "When working on a sub-issue, {index} is the sub-issue number. For standalone issues, {index} is the issue number.",
    "examples": [
      "feat: add fuel efficiency calculation (refs #42)",
-      "fix: correct VIN validation for pre-1981 vehicles (refs #1)"
+      "fix: correct VIN validation for pre-1981 vehicles (refs #1)",
+      "feat: add dashboard provisioning infrastructure (refs #106)",
+      "feat: add API performance dashboard (refs #108)"
    ]
  },
  "pull_requests": {
-    "title_format": "{type}: {summary} (#{index})",
+    "title_format": "{type}: {summary} (#{parent_index})",
+    "note": "PR title always uses the parent issue index.",
    "body_requirements": [
-      "Link issue(s) using 'Fixes #123' or 'Relates to #123'.",
+      "Link parent issue using 'Fixes #{parent_index}'.",
+      "Link all sub-issues using 'Fixes #{sub_index}' on separate lines.",
      "Include test plan and results.",
      "Confirm acceptance criteria completion."
    ],
+    "body_example": "Fixes #105\nFixes #106\nFixes #107\nFixes #108\nFixes #109\nFixes #110\nFixes #111",
    "merge_policy": "squash_or_rebase_ok",
    "template_location": ".gitea/PULL_REQUEST_TEMPLATE.md"
  },
  "execution_loop": [
    "List repo issues in current sprint milestone with status/ready; if none, pull from status/backlog and promote the best candidate to status/ready.",
    "Select one issue (prefer smallest size and highest priority).",
-    "Move issue to status/in-progress.",
+    "Move parent issue to status/in-progress.",
    "[SKILL] Codebase Analysis if unfamiliar area.",
    "[SKILL] Problem Analysis if complex problem.",
    "[SKILL] Decision Critic if uncertain approach.",
-    "[SKILL] Planner writes plan as issue comment.",
+    "If multi-file feature (3+ files): decompose into sub-issues per sub_issues rules. Each sub-issue = one plan milestone.",
+    "[SKILL] Planner writes plan as parent issue comment. Plan milestones map 1:1 to sub-issues.",
    "[SKILL] Plan review cycle: QR plan-completeness -> TW plan-scrub -> QR plan-code -> QR plan-docs.",
-    "Create branch issue-{index}-{slug}.",
-    "[SKILL] Planner executes plan, delegates to Developer per milestone.",
-    "[SKILL] QR post-implementation per milestone (results in issue comment).",
-    "Open PR targeting main and linking issue(s).",
-    "Move issue to status/review.",
-    "[SKILL] Quality Agent validates with RULE 0/1/2 (result in issue comment).",
+    "Create ONE branch issue-{parent_index}-{slug} from main.",
+    "[SKILL] Planner executes plan, delegates to Developer per milestone/sub-issue.",
+    "[SKILL] QR post-implementation per milestone (results in parent issue comment).",
+    "Open ONE PR targeting main. Title uses parent index. Body lists 'Fixes #N' for parent and all sub-issues.",
+    "Move parent issue to status/review.",
+    "[SKILL] Quality Agent validates with RULE 0/1/2 (result in parent issue comment).",
    "If CI/tests fail, iterate until pass.",
-    "When PR is merged, move issue to status/done and close issue if not auto-closed.",
+    "When PR is merged, parent and all sub-issues move to status/done. Close any not auto-closed.",
    "[SKILL] Doc-Sync on affected directories."
  ],
  "skill_integration": {
--- a/.claude/CLAUDE.md
+++ b/.claude/CLAUDE.md
@@ -7,6 +7,7 @@
 | `role-agents/` | Developer, TW, QR, Debugger agents | Delegating execution |
 | `agents/` | Domain agents (Feature, Frontend, Platform, Quality) | Domain-specific work |
 | `skills/` | Reusable skills | Complex multi-step workflows |
+| `hooks/` | PreToolUse hooks (model enforcement) | Debugging hook behavior |
 | `output-styles/` | Output formatting templates | Customizing agent output |
 | `tdd-guard/` | TDD enforcement utilities | Test-driven development |

@@ -24,4 +25,5 @@
 | `skills/incoherence/` | Detect doc/code drift | Periodic audits |
 | `skills/prompt-engineer/` | Prompt optimization | Improving AI prompts |
 | `agents/` | Domain agents (Feature, Frontend, Platform, Quality) | Domain-specific work |
+| `hooks/` | PreToolUse hooks (model enforcement) | Debugging hook behavior |
 | `.ai/workflow-contract.json` | Sprint process, skill integration | Issue workflow |
--- a/.claude/hooks/CLAUDE.md
+++ b/.claude/hooks/CLAUDE.md
@@ -0,0 +1,38 @@
+# hooks/
+
+## Files
+
+| File | What | When to read |
+| ---- | ---- | ------------ |
+| `enforce-agent-model.sh` | Enforces correct model for Task tool calls | Debugging agent model issues |
+
+## enforce-agent-model.sh
+
+PreToolUse hook that ensures Task tool calls use the correct model based on `subagent_type`.
+
+### Agent Model Mapping
+
+| Agent | Required Model |
+|-------|----------------|
+| feature-agent | sonnet |
+| first-frontend-agent | sonnet |
+| platform-agent | sonnet |
+| quality-agent | sonnet |
+| developer | sonnet |
+| technical-writer | sonnet |
+| debugger | sonnet |
+| quality-reviewer | opus |
+| Explore | sonnet |
+| Plan | sonnet |
+| Bash | sonnet |
+| general-purpose | sonnet |
+
+### Behavior
+
+- Blocks Task calls where `model` parameter doesn't match expected value
+- Returns error message instructing Claude to retry with correct model
+- Unknown agent types are allowed through (no enforcement)
+
+### Adding New Agents
+
+Edit the `get_expected_model()` function in `enforce-agent-model.sh` to add new agent mappings.
--- a/.claude/hooks/enforce-agent-model.sh
+++ b/.claude/hooks/enforce-agent-model.sh
@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+# Enforces correct model usage for Task tool based on agent definitions
+# Blocks Task calls that don't specify the correct model for the subagent_type
+
+# Read tool input from stdin
+INPUT=$(cat)
+
+# Extract subagent_type and model from the input
+SUBAGENT_TYPE=$(echo "$INPUT" | jq -r '.subagent_type // empty')
+MODEL=$(echo "$INPUT" | jq -r '.model // empty')
+
+# If no subagent_type, allow (not an agent call)
+if [[ -z "$SUBAGENT_TYPE" ]]; then
+  exit 0
+fi
+
+# Get expected model for agent type
+# Most agents use sonnet, quality-reviewer uses opus
+get_expected_model() {
+  case "$1" in
+    # Custom project agents
+    feature-agent|first-frontend-agent|platform-agent|quality-agent)
+      echo "sonnet"
+      ;;
+    # Role agents
+    developer|technical-writer|debugger)
+      echo "sonnet"
+      ;;
+    quality-reviewer)
+      echo "opus"
+      ;;
+    # Built-in agents - default to sonnet for cost efficiency
+    Explore|Plan|Bash|general-purpose)
+      echo "sonnet"
+      ;;
+    *)
+      # Unknown agent, no enforcement
+      echo ""
+      ;;
+  esac
+}
+
+EXPECTED_MODEL=$(get_expected_model "$SUBAGENT_TYPE")
+
+# If agent not in mapping, allow (unknown agent type)
+if [[ -z "$EXPECTED_MODEL" ]]; then
+  exit 0
+fi
+
+# Check if model matches expected
+if [[ "$MODEL" != "$EXPECTED_MODEL" ]]; then
+  echo "BLOCKED: Agent '$SUBAGENT_TYPE' requires model: '$EXPECTED_MODEL' but got '${MODEL:-<not specified>}'."
+  echo "Retry with: model: \"$EXPECTED_MODEL\""
+  exit 1
+fi
+
+# Model matches, allow the call
+exit 0
--- a/.claude/skills/planner/POST
+++ b/.claude/skills/planner/POST
--- a/.claude/skills/planner/StripeClient.createSubscription
+++ b/.claude/skills/planner/StripeClient.createSubscription
--- a/.claude/skills/planner/SubscriptionPage
+++ b/.claude/skills/planner/SubscriptionPage
--- a/.claude/skills/planner/sync
+++ b/.claude/skills/planner/sync
--- a/.claude/tdd-guard/data/test.json
+++ b/.claude/tdd-guard/data/test.json
@@ -0,0 +1,23 @@
+{
+  "testModules": [
+    {
+      "moduleId": "/Users/egullickson/Documents/Technology/coding/motovaultpro/frontend/src/features/dashboard/components/__tests__/ActionBar.test.tsx",
+      "tests": [
+        {
+          "name": "Module failed to load (Error)",
+          "fullName": "Module failed to load (Error)",
+          "state": "failed",
+          "errors": [
+            {
+              "message": "File not found: tsconfig.json (resolved as: /Users/egullickson/Documents/Technology/coding/motovaultpro/tsconfig.json)",
+              "name": "Error",
+              "stack": "Error: File not found: tsconfig.json (resolved as: /Users/egullickson/Documents/Technology/coding/motovaultpro/tsconfig.json)\n    at ConfigSet.resolvePath (/Users/egullickson/Documents/Technology/coding/motovaultpro/frontend/node_modules/ts-jest/dist/legacy/config/config-set.js:616:19)\n    at ConfigSet._setupConfigSet (/Users/egullickson/Documents/Technology/coding/motovaultpro/frontend/node_modules/ts-jest/dist/legacy/config/config-set.js:322:71)\n    at new ConfigSet (/Users/egullickson/Documents/Technology/coding/motovaultpro/frontend/node_modules/ts-jest/dist/legacy/config/config-set.js:206:14)\n    at TsJestTransformer._createConfigSet (/Users/egullickson/Documents/Technology/coding/motovaultpro/frontend/node_modules/ts-jest/dist/legacy/ts-jest-transformer.js:119:16)\n    at TsJestTransformer._configsFor (/Users/egullickson/Documents/Technology/coding/motovaultpro/frontend/node_modules/ts-jest/dist/legacy/ts-jest-transformer.js:98:34)\n    at TsJestTransformer.getCacheKey (/Users/egullickson/Documents/Technology/coding/motovaultpro/frontend/node_modules/ts-jest/dist/legacy/ts-jest-transformer.js:249:30)\n    at ScriptTransformer._getCacheKey (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/@jest/transform/build/index.js:195:41)\n    at ScriptTransformer._getFileCachePath (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/@jest/transform/build/index.js:231:27)\n    at ScriptTransformer.transformSource (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/@jest/transform/build/index.js:402:32)\n    at ScriptTransformer._transformAndBuildScript (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/@jest/transform/build/index.js:519:40)\n    at ScriptTransformer.transform (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/@jest/transform/build/index.js:558:19)\n    at Runtime.transformFile (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/jest-runtime/build/index.js:1290:53)\n    at Runtime._execModule (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/jest-runtime/build/index.js:1243:34)\n    at Runtime._loadModule (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/jest-runtime/build/index.js:944:12)\n    at Runtime.requireModule (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/jest-runtime/build/index.js:832:12)\n    at jestAdapter (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/jest-circus/build/runner.js:84:33)\n    at processTicksAndRejections (node:internal/process/task_queues:104:5)\n    at runTestInternal (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/jest-runner/build/index.js:275:16)\n    at runTest (/Users/egullickson/Documents/Technology/coding/motovaultpro/node_modules/jest-runner/build/index.js:343:7)"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "unhandledErrors": [],
+  "reason": "failed"
+}
--- a/.env.example
+++ b/.env.example
@@ -0,0 +1,36 @@
+# MotoVaultPro Environment Configuration
+# Copy to .env and fill in environment-specific values
+# Generated .env files should NOT be committed to version control
+#
+# Local dev: No .env needed -- base docker-compose.yml defaults are sandbox values
+# Staging/Production: CI/CD generates .env from Gitea variables + generate-log-config.sh
+
+# ===========================================
+# Stripe Price IDs (environment-specific)
+# ===========================================
+# Sandbox defaults used for local development
+STRIPE_PRO_MONTHLY_PRICE_ID=price_1T1ZHMJXoKkh5RcKwKSSGIlR
+STRIPE_PRO_YEARLY_PRICE_ID=price_1T1ZHnJXoKkh5RcKWlG2MPpX
+STRIPE_ENTERPRISE_MONTHLY_PRICE_ID=price_1T1ZIBJXoKkh5RcKu2jyhqBN
+STRIPE_ENTERPRISE_YEARLY_PRICE_ID=price_1T1ZIQJXoKkh5RcK34YXiJQm
+
+# ===========================================
+# Stripe Publishable Key (baked into frontend at build time)
+# ===========================================
+# VITE_STRIPE_PUBLISHABLE_KEY=pk_test_...
+
+# ===========================================
+# Log Levels (generated by scripts/ci/generate-log-config.sh)
+# ===========================================
+# Run: ./scripts/ci/generate-log-config.sh DEBUG >> .env
+#
+# BACKEND_LOG_LEVEL=debug
+# TRAEFIK_LOG_LEVEL=DEBUG
+# POSTGRES_LOG_STATEMENT=all
+# POSTGRES_LOG_MIN_DURATION=0
+# REDIS_LOGLEVEL=debug
+
+# ===========================================
+# Grafana
+# ===========================================
+# GRAFANA_ADMIN_PASSWORD=admin
--- a/.gitea/CLAUDE.md
+++ b/.gitea/CLAUDE.md
@@ -0,0 +1,14 @@
+# .gitea/
+
+## Files
+
+| File | What | When to read |
+| ---- | ---- | ------------ |
+| `PULL_REQUEST_TEMPLATE.md` | PR template | Creating pull requests |
+
+## Subdirectories
+
+| Directory | What | When to read |
+| --------- | ---- | ------------ |
+| `workflows/` | CI/CD workflow definitions | Pipeline configuration |
+| `ISSUE_TEMPLATE/` | Issue templates (bug, feature, chore) | Creating issues |
--- a/.gitea/SPRINTS.md
+++ b/.gitea/SPRINTS.md
@@ -1,36 +0,0 @@
-# SPRINTS.md — MotoVaultPro Sprint Calendar (2026)
-
-**Cadence:** 2 weeks (14 days)  
-**Sprint weeks:** Monday → Sunday  
-**Naming convention:** `Sprint YYYY-MM-DD` (the Monday start date)
-
-> Note: Sprint 26 ends on **2027-01-03** (it crosses into the next year).
-
-| # | Sprint | Start (Mon) | End (Sun) |
-|---:|---|---|---|
-| 1 | Sprint 2026-01-05 | 2026-01-05 | 2026-01-18 |
-| 2 | Sprint 2026-01-19 | 2026-01-19 | 2026-02-01 |
-| 3 | Sprint 2026-02-02 | 2026-02-02 | 2026-02-15 |
-| 4 | Sprint 2026-02-16 | 2026-02-16 | 2026-03-01 |
-| 5 | Sprint 2026-03-02 | 2026-03-02 | 2026-03-15 |
-| 6 | Sprint 2026-03-16 | 2026-03-16 | 2026-03-29 |
-| 7 | Sprint 2026-03-30 | 2026-03-30 | 2026-04-12 |
-| 8 | Sprint 2026-04-13 | 2026-04-13 | 2026-04-26 |
-| 9 | Sprint 2026-04-27 | 2026-04-27 | 2026-05-10 |
-| 10 | Sprint 2026-05-11 | 2026-05-11 | 2026-05-24 |
-| 11 | Sprint 2026-05-25 | 2026-05-25 | 2026-06-07 |
-| 12 | Sprint 2026-06-08 | 2026-06-08 | 2026-06-21 |
-| 13 | Sprint 2026-06-22 | 2026-06-22 | 2026-07-05 |
-| 14 | Sprint 2026-07-06 | 2026-07-06 | 2026-07-19 |
-| 15 | Sprint 2026-07-20 | 2026-07-20 | 2026-08-02 |
-| 16 | Sprint 2026-08-03 | 2026-08-03 | 2026-08-16 |
-| 17 | Sprint 2026-08-17 | 2026-08-17 | 2026-08-30 |
-| 18 | Sprint 2026-08-31 | 2026-08-31 | 2026-09-13 |
-| 19 | Sprint 2026-09-14 | 2026-09-14 | 2026-09-27 |
-| 20 | Sprint 2026-09-28 | 2026-09-28 | 2026-10-11 |
-| 21 | Sprint 2026-10-12 | 2026-10-12 | 2026-10-25 |
-| 22 | Sprint 2026-10-26 | 2026-10-26 | 2026-11-08 |
-| 23 | Sprint 2026-11-09 | 2026-11-09 | 2026-11-22 |
-| 24 | Sprint 2026-11-23 | 2026-11-23 | 2026-12-06 |
-| 25 | Sprint 2026-12-07 | 2026-12-07 | 2026-12-20 |
-| 26 | Sprint 2026-12-21 | 2026-12-21 | 2027-01-03 |
--- a/.gitea/workflows/production.yaml
+++ b/.gitea/workflows/production.yaml
@@ -19,9 +19,11 @@ on:
 env:
  REGISTRY: git.motovaultpro.com
  DEPLOY_PATH: /opt/motovaultpro
-  COMPOSE_FILE: docker-compose.yml
+  BASE_COMPOSE_FILE: docker-compose.yml
  COMPOSE_BLUE_GREEN: docker-compose.blue-green.yml
-  HEALTH_CHECK_TIMEOUT: "60"
+  COMPOSE_PROD: docker-compose.prod.yml
+  HEALTH_CHECK_TIMEOUT: "240"
+  LOG_LEVEL: INFO

 jobs:
  # ============================================
@@ -34,6 +36,7 @@ jobs:
      target_stack: ${{ steps.determine-stack.outputs.target_stack }}
      backend_image: ${{ steps.set-images.outputs.backend_image }}
      frontend_image: ${{ steps.set-images.outputs.frontend_image }}
+      ocr_image: ${{ steps.set-images.outputs.ocr_image }}
    steps:
      - name: Check Docker availability
        run: |
@@ -53,6 +56,7 @@ jobs:
          TAG="${{ inputs.image_tag }}"
          echo "backend_image=$REGISTRY/egullickson/backend:$TAG" >> $GITHUB_OUTPUT
          echo "frontend_image=$REGISTRY/egullickson/frontend:$TAG" >> $GITHUB_OUTPUT
+          echo "ocr_image=$REGISTRY/egullickson/ocr:$TAG" >> $GITHUB_OUTPUT

      - name: Determine target stack
        id: determine-stack
@@ -83,6 +87,7 @@ jobs:
      TARGET_STACK: ${{ needs.validate.outputs.target_stack }}
      BACKEND_IMAGE: ${{ needs.validate.outputs.backend_image }}
      FRONTEND_IMAGE: ${{ needs.validate.outputs.frontend_image }}
+      OCR_IMAGE: ${{ needs.validate.outputs.ocr_image }}
    steps:
      - name: Checkout scripts, config, and compose files
        uses: actions/checkout@v4
@@ -90,8 +95,11 @@ jobs:
          sparse-checkout: |
            scripts/
            config/
+            secrets/app/google-wif-config.json
            docker-compose.yml
            docker-compose.blue-green.yml
+            docker-compose.prod.yml
+            .env.example
          sparse-checkout-cone-mode: false
          fetch-depth: 1

@@ -101,6 +109,27 @@ jobs:
          rsync -av --delete "$GITHUB_WORKSPACE/scripts/" "$DEPLOY_PATH/scripts/"
          cp "$GITHUB_WORKSPACE/docker-compose.yml" "$DEPLOY_PATH/"
          cp "$GITHUB_WORKSPACE/docker-compose.blue-green.yml" "$DEPLOY_PATH/"
+          cp "$GITHUB_WORKSPACE/docker-compose.prod.yml" "$DEPLOY_PATH/"
+          # WIF credential config (not a secret -- references Auth0 token script path)
+          # Remove any Docker-created directory artifact from failed bind mounts
+          rm -rf "$DEPLOY_PATH/secrets/app/google-wif-config.json"
+          mkdir -p "$DEPLOY_PATH/secrets/app"
+          cp "$GITHUB_WORKSPACE/secrets/app/google-wif-config.json" "$DEPLOY_PATH/secrets/app/"
+
+      - name: Generate environment configuration
+        run: |
+          cd "$DEPLOY_PATH"
+          {
+            echo "# Generated by CI/CD - DO NOT EDIT"
+            echo "STRIPE_PRO_MONTHLY_PRICE_ID=${{ vars.STRIPE_PRO_MONTHLY_PRICE_ID }}"
+            echo "STRIPE_PRO_YEARLY_PRICE_ID=${{ vars.STRIPE_PRO_YEARLY_PRICE_ID }}"
+            echo "STRIPE_ENTERPRISE_MONTHLY_PRICE_ID=${{ vars.STRIPE_ENTERPRISE_MONTHLY_PRICE_ID }}"
+            echo "STRIPE_ENTERPRISE_YEARLY_PRICE_ID=${{ vars.STRIPE_ENTERPRISE_YEARLY_PRICE_ID }}"
+            echo "VITE_STRIPE_PUBLISHABLE_KEY=${{ vars.VITE_STRIPE_PUBLISHABLE_KEY }}"
+            echo "GRAFANA_ADMIN_PASSWORD=${{ secrets.GRAFANA_ADMIN_PASSWORD }}"
+          } > .env
+          chmod +x scripts/ci/generate-log-config.sh
+          ./scripts/ci/generate-log-config.sh "$LOG_LEVEL" >> .env

      - name: Login to registry
        run: |
@@ -108,17 +137,22 @@ jobs:

      - name: Inject secrets
        run: |
-          chmod +x "$GITHUB_WORKSPACE/scripts/inject-secrets.sh"
-          "$GITHUB_WORKSPACE/scripts/inject-secrets.sh"
+          cd "$DEPLOY_PATH"
+          chmod +x scripts/inject-secrets.sh
+          SECRETS_DIR="$DEPLOY_PATH/secrets/app" ./scripts/inject-secrets.sh
        env:
          POSTGRES_PASSWORD: ${{ secrets.POSTGRES_PASSWORD }}
          AUTH0_CLIENT_SECRET: ${{ secrets.AUTH0_CLIENT_SECRET }}
          AUTH0_MANAGEMENT_CLIENT_ID: ${{ secrets.AUTH0_MANAGEMENT_CLIENT_ID }}
          AUTH0_MANAGEMENT_CLIENT_SECRET: ${{ secrets.AUTH0_MANAGEMENT_CLIENT_SECRET }}
+          AUTH0_OCR_CLIENT_ID: ${{ secrets.AUTH0_OCR_CLIENT_ID }}
+          AUTH0_OCR_CLIENT_SECRET: ${{ secrets.AUTH0_OCR_CLIENT_SECRET }}
          GOOGLE_MAPS_API_KEY: ${{ secrets.GOOGLE_MAPS_API_KEY }}
          GOOGLE_MAPS_MAP_ID: ${{ secrets.GOOGLE_MAPS_MAP_ID }}
          CF_DNS_API_TOKEN: ${{ secrets.CF_DNS_API_TOKEN }}
          RESEND_API_KEY: ${{ secrets.RESEND_API_KEY }}
+          STRIPE_SECRET_KEY: ${{ secrets.STRIPE_SECRET_KEY }}
+          STRIPE_WEBHOOK_SECRET: ${{ secrets.STRIPE_WEBHOOK_SECRET }}

      - name: Initialize data directories
        run: |
@@ -136,6 +170,7 @@ jobs:
        run: |
          docker pull $BACKEND_IMAGE
          docker pull $FRONTEND_IMAGE
+          docker pull $OCR_IMAGE

      - name: Record expected image IDs
        id: expected-images
@@ -148,18 +183,50 @@ jobs:
          echo "frontend_id=$FRONTEND_ID" >> $GITHUB_OUTPUT
          echo "backend_id=$BACKEND_ID" >> $GITHUB_OUTPUT

+      - name: Start shared services
+        run: |
+          cd "$DEPLOY_PATH"
+          # Start shared infrastructure services (database, cache, logging)
+          # --no-recreate prevents restarting postgres/redis when config files change
+          # These must persist across blue-green deployments to avoid data service disruption
+          docker compose -f $BASE_COMPOSE_FILE -f $COMPOSE_BLUE_GREEN -f $COMPOSE_PROD up -d --no-recreate \
+            mvp-postgres mvp-redis mvp-loki mvp-alloy mvp-grafana
+
+      - name: Wait for shared services health
+        run: |
+          echo "Waiting for PostgreSQL and Redis to be healthy..."
+          for service in mvp-postgres mvp-redis; do
+            for i in $(seq 1 24); do
+              health=$(docker inspect --format='{{.State.Health.Status}}' $service 2>/dev/null || echo "unknown")
+              if [ "$health" = "healthy" ]; then
+                echo "OK: $service is healthy"
+                break
+              fi
+              if [ $i -eq 24 ]; then
+                echo "ERROR: $service health check timed out (status: $health)"
+                docker logs $service --tail 50 2>/dev/null || true
+                exit 1
+              fi
+              echo "Waiting for $service... (attempt $i/24, status: $health)"
+              sleep 5
+            done
+          done
+          echo "All shared services healthy"
+
      - name: Start target stack
        run: |
          cd "$DEPLOY_PATH"
          export BACKEND_IMAGE=$BACKEND_IMAGE
          export FRONTEND_IMAGE=$FRONTEND_IMAGE
+          export OCR_IMAGE=$OCR_IMAGE
          # --force-recreate ensures containers are recreated even if image tag is same
          # This prevents stale container content when image digest changes
-          docker compose -f $COMPOSE_FILE -f $COMPOSE_BLUE_GREEN up -d --force-recreate \
-            mvp-frontend-$TARGET_STACK mvp-backend-$TARGET_STACK
+          # Start shared OCR service and target stack
+          docker compose -f $BASE_COMPOSE_FILE -f $COMPOSE_BLUE_GREEN -f $COMPOSE_PROD up -d --force-recreate \
+            mvp-ocr mvp-frontend-$TARGET_STACK mvp-backend-$TARGET_STACK

      - name: Wait for stack initialization
-        run: sleep 10
+        run: sleep 5

      - name: Verify container images
        run: |
@@ -194,7 +261,7 @@ jobs:
      - name: Start Traefik
        run: |
          cd "$DEPLOY_PATH"
-          docker compose -f $COMPOSE_FILE -f $COMPOSE_BLUE_GREEN up -d mvp-traefik
+          docker compose -f $BASE_COMPOSE_FILE -f $COMPOSE_BLUE_GREEN -f $COMPOSE_PROD up -d mvp-traefik

      - name: Wait for Traefik
        run: |
@@ -238,22 +305,79 @@ jobs:
      - name: Wait for routing propagation
        run: sleep 5

+      - name: Check container status and health
+        run: |
+          for service in mvp-frontend-$TARGET_STACK mvp-backend-$TARGET_STACK mvp-ocr; do
+            status=$(docker inspect --format='{{.State.Status}}' $service 2>/dev/null || echo "not found")
+            if [ "$status" != "running" ]; then
+              echo "ERROR: $service is not running (status: $status)"
+              docker logs $service --tail 50 2>/dev/null || true
+              exit 1
+            fi
+            echo "OK: $service is running"
+          done
+
+          # Wait for Docker healthchecks to complete (services with healthcheck defined)
+          echo ""
+          echo "Waiting for Docker healthchecks..."
+          for service in mvp-frontend-$TARGET_STACK mvp-backend-$TARGET_STACK mvp-ocr; do
+            # Check if service has a healthcheck defined
+            has_healthcheck=$(docker inspect --format='{{if .Config.Healthcheck}}true{{else}}false{{end}}' $service 2>/dev/null || echo "false")
+            if [ "$has_healthcheck" = "true" ]; then
+              # 48 attempts x 5 seconds = 4 minutes max wait (backend with fresh migrations can take ~3 min)
+              for i in $(seq 1 48); do
+                health=$(docker inspect --format='{{.State.Health.Status}}' $service 2>/dev/null || echo "unknown")
+                if [ "$health" = "healthy" ]; then
+                  echo "OK: $service is healthy"
+                  break
+                fi
+                # Don't fail immediately on unhealthy - container may still be starting up
+                # and can recover. Let the timeout handle truly broken containers.
+                if [ $i -eq 48 ]; then
+                  echo "ERROR: $service health check timed out (status: $health)"
+                  docker logs $service --tail 100 2>/dev/null || true
+                  exit 1
+                fi
+                echo "Waiting for $service healthcheck... (attempt $i/48, status: $health)"
+                sleep 5
+              done
+            else
+              echo "SKIP: $service has no healthcheck defined"
+            fi
+          done
+
+      - name: Wait for backend health
+        run: |
+          for i in $(seq 1 12); do
+            if docker exec mvp-backend-$TARGET_STACK curl -sf http://localhost:3001/health > /dev/null 2>&1; then
+              echo "OK: Backend health check passed"
+              exit 0
+            fi
+            if [ $i -eq 12 ]; then
+              echo "ERROR: Backend health check failed after 12 attempts"
+              docker logs mvp-backend-$TARGET_STACK --tail 100
+              exit 1
+            fi
+            echo "Attempt $i/12: Backend not ready, waiting 5s..."
+            sleep 5
+          done
+
      - name: External health check
        run: |
          REQUIRED_FEATURES='["admin","auth","onboarding","vehicles","documents","fuel-logs","stations","maintenance","platform","notifications","user-profile","user-preferences","user-export"]'

-          for i in 1 2 3 4 5 6; do
+          for i in $(seq 1 12); do
            RESPONSE=$(curl -sf https://motovaultpro.com/api/health 2>/dev/null) || {
-              echo "Attempt $i/6: Connection failed, waiting 10s..."
-              sleep 10
+              echo "Attempt $i/12: Connection failed, waiting 5s..."
+              sleep 5
              continue
            }

            # Check status is "healthy"
            STATUS=$(echo "$RESPONSE" | jq -r '.status')
            if [ "$STATUS" != "healthy" ]; then
-              echo "Attempt $i/6: Status is '$STATUS', not 'healthy'. Waiting 10s..."
-              sleep 10
+              echo "Attempt $i/12: Status is '$STATUS', not 'healthy'. Waiting 5s..."
+              sleep 5
              continue
            fi

@@ -263,8 +387,8 @@ jobs:
            ')

            if [ -n "$MISSING" ]; then
-              echo "Attempt $i/6: Missing features: $MISSING. Waiting 10s..."
-              sleep 10
+              echo "Attempt $i/12: Missing features: $MISSING. Waiting 5s..."
+              sleep 5
              continue
            fi

@@ -273,7 +397,7 @@ jobs:
            exit 0
          done

-          echo "ERROR: Production health check failed after 6 attempts"
+          echo "ERROR: Production health check failed after 12 attempts"
          echo "Last response: $RESPONSE"
          exit 1

--- a/.gitea/workflows/staging.yaml
+++ b/.gitea/workflows/staging.yaml
@@ -15,9 +15,10 @@ on:
 env:
  REGISTRY: git.motovaultpro.com
  DEPLOY_PATH: /opt/motovaultpro
-  COMPOSE_FILE: docker-compose.yml
-  COMPOSE_STAGING: docker-compose.staging.yml
+  BASE_COMPOSE_FILE: docker-compose.yml
+  STAGING_COMPOSE_FILE: docker-compose.staging.yml
  HEALTH_CHECK_TIMEOUT: "60"
+  LOG_LEVEL: DEBUG

 jobs:
  # ============================================
@@ -29,6 +30,7 @@ jobs:
    outputs:
      backend_image: ${{ steps.tags.outputs.backend_image }}
      frontend_image: ${{ steps.tags.outputs.frontend_image }}
+      ocr_image: ${{ steps.tags.outputs.ocr_image }}
      short_sha: ${{ steps.tags.outputs.short_sha }}
    steps:
      - name: Checkout code
@@ -45,6 +47,7 @@ jobs:
          SHORT_SHA="${SHORT_SHA:0:7}"
          echo "backend_image=$REGISTRY/egullickson/backend:$SHORT_SHA" >> $GITHUB_OUTPUT
          echo "frontend_image=$REGISTRY/egullickson/frontend:$SHORT_SHA" >> $GITHUB_OUTPUT
+          echo "ocr_image=$REGISTRY/egullickson/ocr:$SHORT_SHA" >> $GITHUB_OUTPUT
          echo "short_sha=$SHORT_SHA" >> $GITHUB_OUTPUT

      - name: Build backend image
@@ -67,18 +70,32 @@ jobs:
            --build-arg VITE_AUTH0_CLIENT_ID=${{ vars.VITE_AUTH0_CLIENT_ID }} \
            --build-arg VITE_AUTH0_AUDIENCE=${{ vars.VITE_AUTH0_AUDIENCE }} \
            --build-arg VITE_API_BASE_URL=/api \
+            --build-arg VITE_STRIPE_PUBLISHABLE_KEY=${{ vars.VITE_STRIPE_PUBLISHABLE_KEY }} \
            --cache-from $REGISTRY/egullickson/frontend:latest \
            -t ${{ steps.tags.outputs.frontend_image }} \
            -t $REGISTRY/egullickson/frontend:latest \
            -f frontend/Dockerfile \
            frontend

+      - name: Build OCR image
+        run: |
+          docker build \
+            --build-arg BUILDKIT_INLINE_CACHE=1 \
+            --build-arg REGISTRY_MIRRORS=$REGISTRY/egullickson/mirrors \
+            --cache-from $REGISTRY/egullickson/ocr:latest \
+            -t ${{ steps.tags.outputs.ocr_image }} \
+            -t $REGISTRY/egullickson/ocr:latest \
+            -f ocr/Dockerfile \
+            ocr
+
      - name: Push images
        run: |
          docker push ${{ steps.tags.outputs.backend_image }}
          docker push ${{ steps.tags.outputs.frontend_image }}
+          docker push ${{ steps.tags.outputs.ocr_image }}
          docker push $REGISTRY/egullickson/backend:latest
          docker push $REGISTRY/egullickson/frontend:latest
+          docker push $REGISTRY/egullickson/ocr:latest

  # ============================================
  # DEPLOY STAGING - Deploy to staging server
@@ -90,10 +107,38 @@ jobs:
    env:
      BACKEND_IMAGE: ${{ needs.build.outputs.backend_image }}
      FRONTEND_IMAGE: ${{ needs.build.outputs.frontend_image }}
+      OCR_IMAGE: ${{ needs.build.outputs.ocr_image }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

+      - name: Sync config, scripts, and compose files to deploy path
+        run: |
+          rsync -av --delete "$GITHUB_WORKSPACE/config/" "$DEPLOY_PATH/config/"
+          rsync -av --delete "$GITHUB_WORKSPACE/scripts/" "$DEPLOY_PATH/scripts/"
+          cp "$GITHUB_WORKSPACE/docker-compose.yml" "$DEPLOY_PATH/"
+          cp "$GITHUB_WORKSPACE/docker-compose.staging.yml" "$DEPLOY_PATH/"
+          # WIF credential config (not a secret -- references Auth0 token script path)
+          # Remove any Docker-created directory artifact from failed bind mounts
+          rm -rf "$DEPLOY_PATH/secrets/app/google-wif-config.json"
+          mkdir -p "$DEPLOY_PATH/secrets/app"
+          cp "$GITHUB_WORKSPACE/secrets/app/google-wif-config.json" "$DEPLOY_PATH/secrets/app/"
+
+      - name: Generate environment configuration
+        run: |
+          cd "$DEPLOY_PATH"
+          {
+            echo "# Generated by CI/CD - DO NOT EDIT"
+            echo "STRIPE_PRO_MONTHLY_PRICE_ID=${{ vars.STRIPE_PRO_MONTHLY_PRICE_ID }}"
+            echo "STRIPE_PRO_YEARLY_PRICE_ID=${{ vars.STRIPE_PRO_YEARLY_PRICE_ID }}"
+            echo "STRIPE_ENTERPRISE_MONTHLY_PRICE_ID=${{ vars.STRIPE_ENTERPRISE_MONTHLY_PRICE_ID }}"
+            echo "STRIPE_ENTERPRISE_YEARLY_PRICE_ID=${{ vars.STRIPE_ENTERPRISE_YEARLY_PRICE_ID }}"
+            echo "VITE_STRIPE_PUBLISHABLE_KEY=${{ vars.VITE_STRIPE_PUBLISHABLE_KEY }}"
+            echo "GRAFANA_ADMIN_PASSWORD=${{ secrets.GRAFANA_ADMIN_PASSWORD }}"
+          } > .env
+          chmod +x scripts/ci/generate-log-config.sh
+          ./scripts/ci/generate-log-config.sh "$LOG_LEVEL" >> .env
+
      - name: Login to registry
        run: |
          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login -u "${{ secrets.REGISTRY_USER }}" --password-stdin "$REGISTRY"
@@ -108,10 +153,14 @@ jobs:
          AUTH0_CLIENT_SECRET: ${{ secrets.AUTH0_CLIENT_SECRET }}
          AUTH0_MANAGEMENT_CLIENT_ID: ${{ secrets.AUTH0_MANAGEMENT_CLIENT_ID }}
          AUTH0_MANAGEMENT_CLIENT_SECRET: ${{ secrets.AUTH0_MANAGEMENT_CLIENT_SECRET }}
+          AUTH0_OCR_CLIENT_ID: ${{ secrets.AUTH0_OCR_CLIENT_ID }}
+          AUTH0_OCR_CLIENT_SECRET: ${{ secrets.AUTH0_OCR_CLIENT_SECRET }}
          GOOGLE_MAPS_API_KEY: ${{ secrets.GOOGLE_MAPS_API_KEY }}
          GOOGLE_MAPS_MAP_ID: ${{ secrets.GOOGLE_MAPS_MAP_ID }}
          CF_DNS_API_TOKEN: ${{ secrets.CF_DNS_API_TOKEN }}
          RESEND_API_KEY: ${{ secrets.RESEND_API_KEY }}
+          STRIPE_SECRET_KEY: ${{ secrets.STRIPE_SECRET_KEY }}
+          STRIPE_WEBHOOK_SECRET: ${{ secrets.STRIPE_WEBHOOK_SECRET }}

      - name: Initialize data directories
        run: |
@@ -129,17 +178,19 @@ jobs:
        run: |
          docker pull $BACKEND_IMAGE
          docker pull $FRONTEND_IMAGE
+          docker pull $OCR_IMAGE

      - name: Deploy staging stack
        run: |
          cd "$DEPLOY_PATH"
          export BACKEND_IMAGE=$BACKEND_IMAGE
          export FRONTEND_IMAGE=$FRONTEND_IMAGE
-          docker compose -f $COMPOSE_FILE -f $COMPOSE_STAGING down --timeout 30 || true
-          docker compose -f $COMPOSE_FILE -f $COMPOSE_STAGING up -d
+          export OCR_IMAGE=$OCR_IMAGE
+          docker compose -f $BASE_COMPOSE_FILE -f $STAGING_COMPOSE_FILE down --timeout 30 || true
+          docker compose -f $BASE_COMPOSE_FILE -f $STAGING_COMPOSE_FILE up -d

      - name: Wait for services
-        run: sleep 15
+        run: sleep 5

  # ============================================
  # VERIFY STAGING - Health checks
@@ -154,7 +205,7 @@ jobs:

      - name: Check container status and health
        run: |
-          for service in mvp-frontend-staging mvp-backend-staging mvp-postgres-staging mvp-redis-staging; do
+          for service in mvp-frontend-staging mvp-backend-staging mvp-ocr-staging mvp-postgres-staging mvp-redis-staging; do
            status=$(docker inspect --format='{{.State.Status}}' $service 2>/dev/null || echo "not found")
            if [ "$status" != "running" ]; then
              echo "ERROR: $service is not running (status: $status)"
@@ -167,26 +218,25 @@ jobs:
          # Wait for Docker healthchecks to complete (services with healthcheck defined)
          echo ""
          echo "Waiting for Docker healthchecks..."
-          for service in mvp-frontend-staging mvp-backend-staging mvp-postgres-staging mvp-redis-staging; do
+          for service in mvp-frontend-staging mvp-backend-staging mvp-ocr-staging mvp-postgres-staging mvp-redis-staging; do
            # Check if service has a healthcheck defined
            has_healthcheck=$(docker inspect --format='{{if .Config.Healthcheck}}true{{else}}false{{end}}' $service 2>/dev/null || echo "false")
            if [ "$has_healthcheck" = "true" ]; then
-              for i in 1 2 3 4 5 6 7 8 9 10; do
+              # 48 attempts x 5 seconds = 4 minutes max wait (backend with fresh migrations can take ~3 min)
+              for i in $(seq 1 48); do
                health=$(docker inspect --format='{{.State.Health.Status}}' $service 2>/dev/null || echo "unknown")
                if [ "$health" = "healthy" ]; then
                  echo "OK: $service is healthy"
                  break
-                elif [ "$health" = "unhealthy" ]; then
-                  echo "ERROR: $service is unhealthy"
-                  docker logs $service --tail 50 2>/dev/null || true
-                  exit 1
                fi
-                if [ $i -eq 10 ]; then
+                # Don't fail immediately on unhealthy - container may still be starting up
+                # and can recover. Let the timeout handle truly broken containers.
+                if [ $i -eq 48 ]; then
                  echo "ERROR: $service health check timed out (status: $health)"
-                  docker logs $service --tail 50 2>/dev/null || true
+                  docker logs $service --tail 100 2>/dev/null || true
                  exit 1
                fi
-                echo "Waiting for $service healthcheck... (attempt $i/10, status: $health)"
+                echo "Waiting for $service healthcheck... (attempt $i/48, status: $health)"
                sleep 5
              done
            else
@@ -196,36 +246,36 @@ jobs:

      - name: Wait for backend health
        run: |
-          for i in 1 2 3 4 5 6; do
+          for i in $(seq 1 12); do
            if docker exec mvp-backend-staging curl -sf http://localhost:3001/health > /dev/null 2>&1; then
              echo "OK: Backend health check passed"
              exit 0
            fi
-            if [ $i -eq 6 ]; then
-              echo "ERROR: Backend health check failed after 6 attempts"
+            if [ $i -eq 12 ]; then
+              echo "ERROR: Backend health check failed after 12 attempts"
              docker logs mvp-backend-staging --tail 100
              exit 1
            fi
-            echo "Attempt $i/6: Backend not ready, waiting 10s..."
-            sleep 10
+            echo "Attempt $i/12: Backend not ready, waiting 5s..."
+            sleep 5
          done

      - name: Check external endpoint
        run: |
          REQUIRED_FEATURES='["admin","auth","onboarding","vehicles","documents","fuel-logs","stations","maintenance","platform","notifications","user-profile","user-preferences","user-export"]'

-          for i in 1 2 3 4 5 6; do
+          for i in $(seq 1 12); do
            RESPONSE=$(curl -sf https://staging.motovaultpro.com/api/health 2>/dev/null) || {
-              echo "Attempt $i/6: Connection failed, waiting 10s..."
-              sleep 10
+              echo "Attempt $i/12: Connection failed, waiting 5s..."
+              sleep 5
              continue
            }

            # Check status is "healthy"
            STATUS=$(echo "$RESPONSE" | jq -r '.status')
            if [ "$STATUS" != "healthy" ]; then
-              echo "Attempt $i/6: Status is '$STATUS', not 'healthy'. Waiting 10s..."
-              sleep 10
+              echo "Attempt $i/12: Status is '$STATUS', not 'healthy'. Waiting 5s..."
+              sleep 5
              continue
            fi

@@ -235,8 +285,8 @@ jobs:
            ')

            if [ -n "$MISSING" ]; then
-              echo "Attempt $i/6: Missing features: $MISSING. Waiting 10s..."
-              sleep 10
+              echo "Attempt $i/12: Missing features: $MISSING. Waiting 5s..."
+              sleep 5
              continue
            fi

@@ -245,7 +295,7 @@ jobs:
            exit 0
          done

-          echo "ERROR: Staging health check failed after 6 attempts"
+          echo "ERROR: Staging health check failed after 12 attempts"
          echo "Last response: $RESPONSE"
          exit 1

--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@ node_modules/
 .env
 .env.local
 .env.backup
+.env.logging
 dist/
 *.log
 .DS_Store
@@ -12,12 +13,16 @@ coverage/
 *.swo
 .venv
 .playwright-mcp
+__pycache__/
+*.py[cod]
+*$py.class

 # K8s-aligned secret mounts (real files ignored; examples committed)
 secrets/**
 !secrets/
 !secrets/**/
 !secrets/**/*.example
+!secrets/app/google-wif-config.json

 # Traefik ACME certificates (contains private keys)
 data/traefik/acme.json
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1,6 +1,6 @@
 # MotoVaultPro

-Single-tenant vehicle management application with 5-container architecture (Traefik, Frontend, Backend, PostgreSQL, Redis).
+Single-tenant vehicle management application with 9-container architecture (6 application: Traefik, Frontend, Backend, OCR, PostgreSQL, Redis + 3 logging: Loki, Alloy, Grafana).

 ## Files

@@ -8,6 +8,9 @@ Single-tenant vehicle management application with 5-container architecture (Trae
 | ---- | ---- | ------------ |
 | `Makefile` | Build, test, deploy commands | Running any make command |
 | `docker-compose.yml` | Development container orchestration | Local development setup |
+| `docker-compose.staging.yml` | Staging container orchestration | Staging deployment |
+| `docker-compose.prod.yml` | Production container orchestration | Production deployment |
+| `docker-compose.blue-green.yml` | Blue-green deployment orchestration | Zero-downtime deploys |
 | `package.json` | Root workspace dependencies | Dependency management |
 | `README.md` | Project overview | First-time setup |

@@ -17,19 +20,23 @@ Single-tenant vehicle management application with 5-container architecture (Trae
 | --------- | ---- | ------------ |
 | `backend/` | Fastify API server with feature capsules | Backend development |
 | `frontend/` | React/Vite SPA with MUI | Frontend development |
+| `ocr/` | Python OCR microservice (Tesseract) | OCR pipeline, receipt/VIN extraction |
 | `docs/` | Project documentation hub | Architecture, APIs, testing |
-| `config/` | Configuration files (Traefik, monitoring) | Infrastructure setup |
-| `scripts/` | Utility scripts (backup, deploy) | Automation tasks |
+| `config/` | Configuration files (Traefik, logging stack) | Infrastructure setup |
+| `scripts/` | Utility scripts (backup, deploy, CI) | Automation tasks |
 | `.ai/` | AI context and workflow contracts | AI-assisted development |
 | `.claude/` | Claude Code agents and skills | Delegating to agents, using skills |
 | `.gitea/` | Gitea workflows and templates | CI/CD, issue templates |
 | `ansible/` | Ansible deployment playbooks | Server provisioning |
+| `certs/` | TLS certificates | SSL/TLS configuration |
+| `secrets/` | Docker secrets (Stripe keys, Traefik) | Secret management |
+| `data/` | Persistent data volumes (backups, documents) | Storage paths, volume mounts |

-## Build
+## Build for staging and production. NOT FOR DEVELOPMENT

 ```bash
-make setup    # First-time setup (builds containers, runs migrations)
-make rebuild  # Rebuild containers after changes
+make setup    # First-time setup 
+make rebuild  # Rebuild containers
 ```

 ## Test
@@ -167,13 +174,23 @@ Issues are the source of truth. See `.ai/workflow-contract.json` for complete wo
 - Every PR must link to at least one issue
 - Use Gitea MCP tools for issue/label/branch/PR operations
 - Labels: `status/backlog` -> `status/ready` -> `status/in-progress` -> `status/review` -> `status/done`
- Branches: `issue-{index}-{slug}` (e.g., `issue-42-add-fuel-report`)
+- Branches: `issue-{parent_index}-{slug}` (e.g., `issue-42-add-fuel-report`)
 - Commits: `{type}: {summary} (refs #{index})` (e.g., `feat: add fuel report (refs #42)`)

+### Sub-Issue Decomposition
+Multi-file features (3+ files) must be broken into sub-issues for smaller AI context windows:
+- **Sub-issue title**: `{type}: {summary} (#{parent_index})` -- parent index in title
+- **Sub-issue body**: First line `Relates to #{parent_index}`
+- **ONE branch** per parent issue only. Never branch per sub-issue.
+- **ONE PR** per parent issue. Body lists `Fixes #N` for parent and every sub-issue.
+- **Commits** reference the specific sub-issue: `feat: add dashboard (refs #107)`
+- **Status labels** tracked on parent only. Sub-issues stay `status/backlog`.
+- **Plan milestones** map 1:1 to sub-issues.
+
 ## Architecture Context for AI

-### Simplified 5-Container Architecture
-**MotoVaultPro uses a simplified architecture:** A single-tenant application with 5 containers - Traefik, Frontend, Backend, PostgreSQL, and Redis. Application features in `backend/src/features/[name]/` are self-contained modules within the backend service, including the platform feature for vehicle data and VIN decoding.
+### 9-Container Architecture
+**MotoVaultPro uses a unified architecture:** A single-tenant application with 9 containers - 6 application (Traefik, Frontend, Backend, OCR, PostgreSQL, Redis) + 3 logging (Loki, Alloy, Grafana). Application features in `backend/src/features/[name]/` are self-contained modules within the backend service, including the platform feature for vehicle data and VIN decoding. See `docs/LOGGING.md` for unified logging system documentation.

 ### Key Principles for AI Understanding
 - **Feature Capsule Organization**: Application features are self-contained modules within the backend
--- a/README.md
+++ b/README.md
@@ -1,17 +1,17 @@
 # MotoVaultPro — Simplified Architecture

-Simplified 5-container architecture with integrated platform feature.
+9-container architecture (6 application + 3 logging) with integrated platform feature.

 ## Requirements
 - Mobile + Desktop: Implement and test every feature on both.
 - Docker-first, production-only: All testing and validation in containers.
 - See `CLAUDE.md` for development partnership guidelines.

-## Quick Start (containers)
+## Staging and Production Commands. NOT FOR DEVELOPMENT (containers)
 ```bash
 make setup    # build + start + migrate (uses mvp-* containers)
 make start    # start 5 services
-make rebuild  # rebuild on changes
+make rebuild  # 
 make logs     # tail all logs
 make migrate  # run DB migrations
 ```
@@ -240,10 +240,19 @@ make migrate  # run DB migrations
    Skills: codebase-analysis, problem-analysis, decision-critic, planner, doc-sync
    Role-Agents: Developer, Technical Writer (TW), Quality Reviewer (QR), Debugger
    Domain Agents: Feature Agent, Frontend Agent, Platform Agent, Quality Agent
-    
+
    Labels: status/backlog -> status/ready -> status/in-progress -> status/review -> status/done
    Commits: {type}: {summary} (refs #{N})  |  Types: feat, fix, chore, docs, refactor, test
    Branches: issue-{N}-{slug}  |  Example: issue-42-add-fuel-report
+
+    SUB-ISSUE PATTERN (multi-file features)
+    ----------------------------------------
+    Parent: #105 "feat: Add Grafana dashboards"
+    Sub:    #106 "feat: Dashboard provisioning (#105)"  <-- parent index in title
+    Branch: issue-105-add-grafana-dashboards            <-- ONE branch, parent index
+    Commit: feat: add provisioning (refs #106)          <-- refs specific sub-issue
+    PR:     feat: Add Grafana dashboards (#105)         <-- ONE PR, parent index
+            Body: Fixes #105, Fixes #106, Fixes #107... <-- closes all
    
    QUALITY RULES
    -------------
--- a/ansible/CLAUDE.md
+++ b/ansible/CLAUDE.md
@@ -0,0 +1,11 @@
+# ansible/
+
+## Files
+
+| File | What | When to read |
+| ---- | ---- | ------------ |
+| `deploy-production-runner.yml` | Production runner deployment | Production deployments |
+| `deploy-staging-runner.yml` | Staging runner deployment | Staging deployments |
+| `inventory.yml` | Server inventory | Server host configuration |
+| `inventory.yml.example` | Example inventory template | Setting up new environments |
+| `config.yaml.j2` | Jinja2 config template | Runner configuration |
--- a/ansible/deploy-production-runner.yml
+++ b/ansible/deploy-production-runner.yml
@@ -269,24 +269,17 @@
      when: gitea_registry_token is defined

    # ============================================
-    # Maintenance Scripts
+    # Remove Legacy Docker Cleanup (was destroying volumes)
    # ============================================
-    - name: Create Docker cleanup script
-      copy:
-        dest: /usr/local/bin/docker-cleanup.sh
-        content: |
-          #!/bin/bash
-          # Remove unused Docker resources older than 7 days
-          docker system prune -af --filter "until=168h"
-          docker volume prune -f
-        mode: '0755'
-
-    - name: Schedule Docker cleanup cron job
+    - name: Remove legacy Docker cleanup cron job
      cron:
        name: "Docker cleanup"
-        minute: "0"
-        hour: "3"
-        job: "/usr/local/bin/docker-cleanup.sh >> /var/log/docker-cleanup.log 2>&1"
+        state: absent
+
+    - name: Remove legacy Docker cleanup script
+      file:
+        path: /usr/local/bin/docker-cleanup.sh
+        state: absent

    # ============================================
    # Production-Specific Security Hardening
--- a/ansible/deploy-staging-runner.yml
+++ b/ansible/deploy-staging-runner.yml
@@ -300,24 +300,17 @@
      when: gitea_registry_token is defined

    # ============================================
-    # Maintenance Scripts
+    # Remove Legacy Docker Cleanup (was destroying volumes)
    # ============================================
-    - name: Create Docker cleanup script
-      copy:
-        dest: /usr/local/bin/docker-cleanup.sh
-        content: |
-          #!/bin/bash
-          # Remove unused Docker resources older than 7 days
-          docker system prune -af --filter "until=168h"
-          docker volume prune -f
-        mode: '0755'
-
-    - name: Schedule Docker cleanup cron job
+    - name: Remove legacy Docker cleanup cron job
      cron:
        name: "Docker cleanup"
-        minute: "0"
-        hour: "3"
-        job: "/usr/local/bin/docker-cleanup.sh >> /var/log/docker-cleanup.log 2>&1"
+        state: absent
+
+    - name: Remove legacy Docker cleanup script
+      file:
+        path: /usr/local/bin/docker-cleanup.sh
+        state: absent

  handlers:
    - name: Restart act_runner
--- a/backend/CLAUDE.md
+++ b/backend/CLAUDE.md
@@ -7,7 +7,8 @@
 | `README.md` | Backend quickstart and commands | Getting started with backend development |
 | `package.json` | Dependencies and npm scripts | Adding dependencies, understanding build |
 | `tsconfig.json` | TypeScript configuration | Compiler settings, path aliases |
-| `jest.config.ts` | Jest test configuration | Test setup, coverage settings |
+| `eslint.config.js` | ESLint configuration | Linting rules, code style |
+| `jest.config.js` | Jest test configuration | Test setup, coverage settings |
 | `Dockerfile` | Container build definition | Docker builds, deployment |

 ## Subdirectories
@@ -15,4 +16,4 @@
 | Directory | What | When to read |
 | --------- | ---- | ------------ |
 | `src/` | Application source code | Any backend development |
-| `scripts/` | Utility scripts | Database scripts, automation |
+| `scripts/` | Utility scripts (docker-entrypoint) | Container startup, automation |
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -20,21 +20,26 @@
        "fastify": "^5.2.0",
        "fastify-plugin": "^5.0.1",
        "file-type": "^16.5.4",
+        "form-data": "^4.0.0",
        "get-jwks": "^11.0.3",
        "ioredis": "^5.4.2",
        "js-yaml": "^4.1.0",
+        "mailparser": "^3.9.3",
        "node-cron": "^3.0.3",
        "opossum": "^8.0.0",
        "pg": "^8.13.1",
+        "pino": "^9.6.0",
        "resend": "^3.0.0",
+        "stripe": "^20.2.0",
+        "svix": "^1.85.0",
        "tar": "^7.4.3",
-        "winston": "^3.17.0",
        "zod": "^3.24.1"
      },
      "devDependencies": {
        "@eslint/js": "^9.17.0",
        "@types/jest": "^29.5.10",
        "@types/js-yaml": "^4.0.9",
+        "@types/mailparser": "^3.4.6",
        "@types/node": "^22.0.0",
        "@types/node-cron": "^3.0.11",
        "@types/opossum": "^8.0.0",
@@ -81,7 +86,6 @@
      "integrity": "sha512-e7jT4DxYvIDLk1ZHmU/m/mB19rex9sv0c2ftBtjSBv+kVM/902eh0fINUzD7UwLLNR+jU585GxUJ8/EBfAM5fw==",
      "dev": true,
      "license": "MIT",
-      "peer": true,
      "dependencies": {
        "@babel/code-frame": "^7.27.1",
        "@babel/generator": "^7.28.5",
@@ -577,15 +581,6 @@
      "dev": true,
      "license": "MIT"
    },
-    "node_modules/@colors/colors": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.6.0.tgz",
-      "integrity": "sha512-Ir+AOibqzrIsL6ajt3Rz3LskB7OiMVHqltZmspbW/TJuTVuyOMirVqAkjfY6JISiLHgyNqicAC8AyHHGzNd/dA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.1.90"
-      }
-    },
    "node_modules/@cspotcode/source-map-support": {
      "version": "0.8.1",
      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
@@ -610,17 +605,6 @@
        "@jridgewell/sourcemap-codec": "^1.4.10"
      }
    },
-    "node_modules/@dabh/diagnostics": {
-      "version": "2.0.8",
-      "resolved": "https://registry.npmjs.org/@dabh/diagnostics/-/diagnostics-2.0.8.tgz",
-      "integrity": "sha512-R4MSXTVnuMzGD7bzHdW2ZhhdPC/igELENcq5IjEverBvq5hn1SXCWcsi6eSsdWP0/Ur+SItRRjAktmdoX/8R/Q==",
-      "license": "MIT",
-      "dependencies": {
-        "@so-ric/colorspace": "^1.1.6",
-        "enabled": "2.0.x",
-        "kuler": "^2.0.0"
-      }
-    },
    "node_modules/@eslint-community/eslint-utils": {
      "version": "4.9.0",
      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.0.tgz",
@@ -1784,15 +1768,11 @@
        "@sinonjs/commons": "^3.0.0"
      }
    },
-    "node_modules/@so-ric/colorspace": {
-      "version": "1.1.6",
-      "resolved": "https://registry.npmjs.org/@so-ric/colorspace/-/colorspace-1.1.6.tgz",
-      "integrity": "sha512-/KiKkpHNOBgkFJwu9sh48LkHSMYGyuTcSFK/qMBdnOAlrRJzRSXAOFB5qwzaVQuDl8wAvHVMkaASQDReTahxuw==",
-      "license": "MIT",
-      "dependencies": {
-        "color": "^5.0.2",
-        "text-hex": "1.0.x"
-      }
+    "node_modules/@stablelib/base64": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@stablelib/base64/-/base64-1.0.1.tgz",
+      "integrity": "sha512-1bnPQqSxSuc3Ii6MhBysoWCg58j97aUjuCSZrGSmDxNqtytIi0k8utUenAwTZN4V5mXXYGsVUI9zeBqy+jBOSQ==",
+      "license": "MIT"
    },
    "node_modules/@tokenizer/token": {
      "version": "0.3.0",
@@ -1949,6 +1929,30 @@
      "dev": true,
      "license": "MIT"
    },
+    "node_modules/@types/mailparser": {
+      "version": "3.4.6",
+      "resolved": "https://registry.npmjs.org/@types/mailparser/-/mailparser-3.4.6.tgz",
+      "integrity": "sha512-wVV3cnIKzxTffaPH8iRnddX1zahbYB1ZEoAxyhoBo3TBCBuK6nZ8M8JYO/RhsCuuBVOw/DEN/t/ENbruwlxn6Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*",
+        "iconv-lite": "^0.6.3"
+      }
+    },
+    "node_modules/@types/mailparser/node_modules/iconv-lite": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
+      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "safer-buffer": ">= 2.1.2 < 3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
    "node_modules/@types/methods": {
      "version": "1.1.4",
      "resolved": "https://registry.npmjs.org/@types/methods/-/methods-1.1.4.tgz",
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-      "dev": true,
+      "devOptional": true,
      "license": "MIT",
-      "peer": true,
      "dependencies": {
        "undici-types": "~6.21.0"
      }
@@ -2027,12 +2030,6 @@
        "@types/superagent": "^8.1.0"
      }
    },
-    "node_modules/@types/triple-beam": {
-      "version": "1.3.5",
-      "resolved": "https://registry.npmjs.org/@types/triple-beam/-/triple-beam-1.3.5.tgz",
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-      "license": "MIT"
-    },
    "node_modules/@types/yargs": {
      "version": "17.0.35",
      "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.35.tgz",
@@ -2095,7 +2092,6 @@
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-      "peer": true,
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        "@typescript-eslint/scope-manager": "8.50.0",
        "@typescript-eslint/types": "8.50.0",
@@ -2307,6 +2303,17 @@
        "url": "https://opencollective.com/typescript-eslint"
      }
    },
+    "node_modules/@zone-eu/mailsplit": {
+      "version": "5.4.8",
+      "resolved": "https://registry.npmjs.org/@zone-eu/mailsplit/-/mailsplit-5.4.8.tgz",
+      "integrity": "sha512-eEyACj4JZ7sjzRvy26QhLgKEMWwQbsw1+QZnlLX+/gihcNH07lVPOcnwf5U6UAL7gkc//J3jVd76o/WS+taUiA==",
+      "license": "(MIT OR EUPL-1.1+)",
+      "dependencies": {
+        "libbase64": "1.3.0",
+        "libmime": "5.3.7",
+        "libqp": "2.1.1"
+      }
+    },
    "node_modules/abbrev": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-2.0.0.tgz",
@@ -2340,7 +2347,6 @@
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      "dev": true,
      "license": "MIT",
-      "peer": true,
      "bin": {
        "acorn": "bin/acorn"
      },
@@ -2513,12 +2519,6 @@
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      }
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-    "node_modules/async": {
-      "version": "3.2.6",
-      "resolved": "https://registry.npmjs.org/async/-/async-3.2.6.tgz",
-      "integrity": "sha512-htCUDlxyyCLMgaM3xXg0C0LW2xqfuQ6p05pCEIsXuyQ+a1koYKTuBMzRNwmybfLgvJDMd0r1LTn4+E0Ti6C2AA==",
-      "license": "MIT"
-    },
    "node_modules/asynckit": {
      "version": "0.4.0",
      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -2813,7 +2813,6 @@
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-      "peer": true,
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@@ -2899,7 +2898,6 @@
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@@ -3092,19 +3090,6 @@
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-    "node_modules/color": {
-      "version": "5.0.3",
-      "resolved": "https://registry.npmjs.org/color/-/color-5.0.3.tgz",
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-      "dependencies": {
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-        "color-string": "^2.1.3"
-      },
-      "engines": {
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    "node_modules/color-convert": {
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-      "license": "MIT",
-      "dependencies": {
-        "color-name": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=18"
-      }
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-    "node_modules/color-string/node_modules/color-name": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/color-name/-/color-name-2.1.0.tgz",
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-      "license": "MIT",
-      "engines": {
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-    "node_modules/color/node_modules/color-convert": {
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-      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-3.1.3.tgz",
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-      "license": "MIT",
-      "dependencies": {
-        "color-name": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=14.6"
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-    "node_modules/color/node_modules/color-name": {
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-      "license": "MIT"
+    "node_modules/encoding-japanese": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/encoding-japanese/-/encoding-japanese-2.2.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=8.10.0"
+      }
    },
    "node_modules/entities": {
      "version": "4.5.0",
@@ -3668,7 +3614,6 @@
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        "@eslint-community/regexpp": "^4.12.1",
@@ -4002,6 +3947,12 @@
      "dev": true,
      "license": "MIT"
    },
+    "node_modules/fast-sha256": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/fast-sha256/-/fast-sha256-1.3.0.tgz",
+      "integrity": "sha512-n11RGP/lrWEFI/bWdygLxhI+pVeo1ZYIVwvvPkW7azl/rOy+F3HYRZ2K5zeE9mmkhQppyv9sQFx0JM9UabnpPQ==",
+      "license": "Unlicense"
+    },
    "node_modules/fast-uri": {
      "version": "3.1.0",
      "resolved": "https://registry.npmjs.org/fast-uri/-/fast-uri-3.1.0.tgz",
@@ -4079,6 +4030,49 @@
      ],
      "license": "MIT"
    },
+    "node_modules/fastify/node_modules/pino": {
+      "version": "10.3.0",
+      "resolved": "https://registry.npmjs.org/pino/-/pino-10.3.0.tgz",
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    "node_modules/steed": {
      "version": "1.1.3",
      "resolved": "https://registry.npmjs.org/steed/-/steed-1.1.3.tgz",
@@ -7635,6 +7673,26 @@
        "url": "https://github.com/sponsors/sindresorhus"
      }
    },
+    "node_modules/stripe": {
+      "version": "20.2.0",
+      "resolved": "https://registry.npmjs.org/stripe/-/stripe-20.2.0.tgz",
+      "integrity": "sha512-m8niTfdm3nPP/yQswRWMwQxqEUcTtB3RTJQ9oo6NINDzgi7aPOadsH/fPXIIfL1Sc5+lqQFKSk7WiO6CXmvaeA==",
+      "license": "MIT",
+      "dependencies": {
+        "qs": "^6.14.1"
+      },
+      "engines": {
+        "node": ">=16"
+      },
+      "peerDependencies": {
+        "@types/node": ">=16"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        }
+      }
+    },
    "node_modules/strtok3": {
      "version": "6.3.0",
      "resolved": "https://registry.npmjs.org/strtok3/-/strtok3-6.3.0.tgz",
@@ -7713,6 +7771,29 @@
        "url": "https://github.com/sponsors/ljharb"
      }
    },
+    "node_modules/svix": {
+      "version": "1.85.0",
+      "resolved": "https://registry.npmjs.org/svix/-/svix-1.85.0.tgz",
+      "integrity": "sha512-4OxNw++bnNay8SoBwESgzfjMnYmurS1qBX+luhzvljr6EAPn/hqqmkdCR1pbgIe1K1+BzKZEHjAKz9OYrKJYwQ==",
+      "license": "MIT",
+      "dependencies": {
+        "standardwebhooks": "1.0.0",
+        "uuid": "^10.0.0"
+      }
+    },
+    "node_modules/svix/node_modules/uuid": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-10.0.0.tgz",
+      "integrity": "sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
    "node_modules/tar": {
      "version": "7.5.2",
      "resolved": "https://registry.npmjs.org/tar/-/tar-7.5.2.tgz",
@@ -7753,12 +7834,6 @@
        "node": ">=8"
      }
    },
-    "node_modules/text-hex": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/text-hex/-/text-hex-1.0.0.tgz",
-      "integrity": "sha512-uuVGNWzgJ4yhRaNSiubPY7OjISw4sw4E5Uv0wbjp+OzcbmVU/rsT8ujgcXJhn9ypzsgr5vlzpPqP+MBBKcGvbg==",
-      "license": "MIT"
-    },
    "node_modules/thread-stream": {
      "version": "3.1.0",
      "resolved": "https://registry.npmjs.org/thread-stream/-/thread-stream-3.1.0.tgz",
@@ -7809,7 +7884,6 @@
      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
      "dev": true,
      "license": "MIT",
-      "peer": true,
      "engines": {
        "node": ">=12"
      },
@@ -7817,6 +7891,15 @@
        "url": "https://github.com/sponsors/jonschlinkert"
      }
    },
+    "node_modules/tlds": {
+      "version": "1.261.0",
+      "resolved": "https://registry.npmjs.org/tlds/-/tlds-1.261.0.tgz",
+      "integrity": "sha512-QXqwfEl9ddlGBaRFXIvNKK6OhipSiLXuRuLJX5DErz0o0Q0rYxulWLdFryTkV5PkdZct5iMInwYEGe/eR++1AA==",
+      "license": "MIT",
+      "bin": {
+        "tlds": "bin.js"
+      }
+    },
    "node_modules/tmpl": {
      "version": "1.0.5",
      "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.5.tgz",
@@ -7873,15 +7956,6 @@
        "nodetouch": "bin/nodetouch.js"
      }
    },
-    "node_modules/triple-beam": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/triple-beam/-/triple-beam-1.4.1.tgz",
-      "integrity": "sha512-aZbgViZrg1QNcG+LULa7nhZpJTZSLm/mXnHXnbAbjmN5aSa0y7V+wvv6+4WaBtpISJzThKy+PIPxc1Nq1EJ9mg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 14.0.0"
-      }
-    },
    "node_modules/ts-api-utils": {
      "version": "2.1.0",
      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.1.0.tgz",
@@ -7967,7 +8041,6 @@
      "integrity": "sha512-f0FFpIdcHgn8zcPSbf1dRevwt047YMnaiJM3u2w2RewrB+fob/zePZcrOyQoLMMO7aBIddLcQIEK5dYjkLnGrQ==",
      "dev": true,
      "license": "MIT",
-      "peer": true,
      "dependencies": {
        "@cspotcode/source-map-support": "^0.8.0",
        "@tsconfig/node10": "^1.0.7",
@@ -8055,7 +8128,6 @@
      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
      "dev": true,
      "license": "Apache-2.0",
-      "peer": true,
      "bin": {
        "tsc": "bin/tsc",
        "tsserver": "bin/tsserver"
@@ -8088,6 +8160,12 @@
        "typescript": ">=4.8.4 <6.0.0"
      }
    },
+    "node_modules/uc.micro": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-2.1.0.tgz",
+      "integrity": "sha512-ARDJmphmdvUk6Glw7y9DQ2bFkKBHwQHLi2lsaH6PPmz/Ka9sFOBsBluozhDltWmnv9u/cF6Rt87znRTPV+yp/A==",
+      "license": "MIT"
+    },
    "node_modules/uglify-js": {
      "version": "3.19.3",
      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.19.3.tgz",
@@ -8156,12 +8234,6 @@
        "punycode": "^2.1.0"
      }
    },
-    "node_modules/util-deprecate": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
-      "license": "MIT"
-    },
    "node_modules/uuid": {
      "version": "8.3.2",
      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
@@ -8218,42 +8290,6 @@
        "node": ">= 8"
      }
    },
-    "node_modules/winston": {
-      "version": "3.19.0",
-      "resolved": "https://registry.npmjs.org/winston/-/winston-3.19.0.tgz",
-      "integrity": "sha512-LZNJgPzfKR+/J3cHkxcpHKpKKvGfDZVPS4hfJCc4cCG0CgYzvlD6yE/S3CIL/Yt91ak327YCpiF/0MyeZHEHKA==",
-      "license": "MIT",
-      "dependencies": {
-        "@colors/colors": "^1.6.0",
-        "@dabh/diagnostics": "^2.0.8",
-        "async": "^3.2.3",
-        "is-stream": "^2.0.0",
-        "logform": "^2.7.0",
-        "one-time": "^1.0.0",
-        "readable-stream": "^3.4.0",
-        "safe-stable-stringify": "^2.3.1",
-        "stack-trace": "0.0.x",
-        "triple-beam": "^1.3.0",
-        "winston-transport": "^4.9.0"
-      },
-      "engines": {
-        "node": ">= 12.0.0"
-      }
-    },
-    "node_modules/winston-transport": {
-      "version": "4.9.0",
-      "resolved": "https://registry.npmjs.org/winston-transport/-/winston-transport-4.9.0.tgz",
-      "integrity": "sha512-8drMJ4rkgaPo1Me4zD/3WLfI/zPdA9o2IipKODunnGDcuqbHwjsbB79ylv04LCGGzU0xQ6vTznOMpQGaLhhm6A==",
-      "license": "MIT",
-      "dependencies": {
-        "logform": "^2.7.0",
-        "readable-stream": "^3.6.2",
-        "triple-beam": "^1.3.0"
-      },
-      "engines": {
-        "node": ">= 12.0.0"
-      }
-    },
    "node_modules/word-wrap": {
      "version": "1.2.5",
      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
--- a/backend/package.json
+++ b/backend/package.json
@@ -18,45 +18,50 @@
    "type-check": "tsc --noEmit"
  },
  "dependencies": {
-    "pg": "^8.13.1",
-    "ioredis": "^5.4.2",
-    "@fastify/multipart": "^9.0.1",
-    "axios": "^1.7.9",
-    "opossum": "^8.0.0",
-    "winston": "^3.17.0",
-    "zod": "^3.24.1",
-    "js-yaml": "^4.1.0",
-    "fastify": "^5.2.0",
+    "@fastify/autoload": "^6.0.1",
    "@fastify/cors": "^11.2.0",
    "@fastify/helmet": "^13.0.2",
    "@fastify/jwt": "^10.0.0",
+    "@fastify/multipart": "^9.0.1",
    "@fastify/type-provider-typebox": "^6.1.0",
    "@sinclair/typebox": "^0.34.0",
-    "fastify-plugin": "^5.0.1",
-    "@fastify/autoload": "^6.0.1",
-    "get-jwks": "^11.0.3",
-    "file-type": "^16.5.4",
-    "resend": "^3.0.0",
-    "node-cron": "^3.0.3",
    "auth0": "^4.12.0",
-    "tar": "^7.4.3"
+    "axios": "^1.7.9",
+    "fastify": "^5.2.0",
+    "fastify-plugin": "^5.0.1",
+    "file-type": "^16.5.4",
+    "form-data": "^4.0.0",
+    "get-jwks": "^11.0.3",
+    "ioredis": "^5.4.2",
+    "js-yaml": "^4.1.0",
+    "mailparser": "^3.9.3",
+    "node-cron": "^3.0.3",
+    "opossum": "^8.0.0",
+    "pg": "^8.13.1",
+    "pino": "^9.6.0",
+    "resend": "^3.0.0",
+    "stripe": "^20.2.0",
+    "svix": "^1.85.0",
+    "tar": "^7.4.3",
+    "zod": "^3.24.1"
  },
  "devDependencies": {
-    "@types/node": "^22.0.0",
-    "@types/pg": "^8.10.9",
-    "@types/js-yaml": "^4.0.9",
-    "@types/node-cron": "^3.0.11",
-    "typescript": "^5.7.2",
-    "ts-node": "^10.9.1",
-    "nodemon": "^3.1.9",
-    "jest": "^29.7.0",
-    "@types/jest": "^29.5.10",
-    "ts-jest": "^29.1.1",
-    "supertest": "^7.1.4",
-    "@types/supertest": "^6.0.3",
-    "@types/opossum": "^8.0.0",
-    "eslint": "^9.17.0",
    "@eslint/js": "^9.17.0",
+    "@types/jest": "^29.5.10",
+    "@types/js-yaml": "^4.0.9",
+    "@types/mailparser": "^3.4.6",
+    "@types/node": "^22.0.0",
+    "@types/node-cron": "^3.0.11",
+    "@types/opossum": "^8.0.0",
+    "@types/pg": "^8.10.9",
+    "@types/supertest": "^6.0.3",
+    "eslint": "^9.17.0",
+    "jest": "^29.7.0",
+    "nodemon": "^3.1.9",
+    "supertest": "^7.1.4",
+    "ts-jest": "^29.1.1",
+    "ts-node": "^10.9.1",
+    "typescript": "^5.7.2",
    "typescript-eslint": "^8.18.1"
  }
 }
--- a/backend/src/_system/CLAUDE.md
+++ b/backend/src/_system/CLAUDE.md
@@ -0,0 +1,10 @@
+# _system/
+
+## Subdirectories
+
+| Directory | What | When to read |
+| --------- | ---- | ------------ |
+| `cli/` | CLI commands and tools | Running backend CLI commands |
+| `migrations/` | Database migration runner | Running or writing migrations |
+| `schema/` | Database schema generation | Schema export, documentation |
+| `scripts/` | System utility scripts | Database maintenance, automation |
--- a/backend/src/_system/migrations/run-all.ts
+++ b/backend/src/_system/migrations/run-all.ts
@@ -17,7 +17,8 @@ const pool = new Pool({
 const MIGRATION_ORDER = [
  'features/vehicles',          // Primary entity, defines update_updated_at_column()
  'features/platform',          // Normalized make/model/trim schema for dropdowns
-  'features/documents',         // Depends on vehicles; provides documents table
+  'features/user-profile',      // User profile management; needed by documents migration
+  'features/documents',         // Depends on vehicles, user-profile; provides documents table
  'core/user-preferences',      // Depends on update_updated_at_column()
  'features/fuel-logs',         // Depends on vehicles
  'features/maintenance',       // Depends on vehicles
@@ -25,8 +26,12 @@ const MIGRATION_ORDER = [
  'features/admin',             // Admin role management and oversight; depends on update_updated_at_column()
  'features/backup',            // Admin backup feature; depends on update_updated_at_column()
  'features/notifications',     // Depends on maintenance and documents
-  'features/user-profile',      // User profile management; independent
+  'features/email-ingestion',   // Depends on documents, notifications (extends email_templates)
  'features/terms-agreement',   // Terms & Conditions acceptance audit trail
+  'features/audit-log',         // Centralized audit logging; independent
+  'features/ownership-costs',   // Depends on vehicles and documents; TCO recurring costs
+  'features/subscriptions',     // Stripe subscriptions; depends on user-profile, vehicles
+  'core/identity-migration',    // Cross-cutting UUID migration; must run after all feature tables exist
 ];

 // Base directory where migrations are copied inside the image (set by Dockerfile)
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -10,6 +10,7 @@ import fastifyMultipart from '@fastify/multipart';
 // Core plugins
 import authPlugin from './core/plugins/auth.plugin';
 import adminGuardPlugin, { setAdminGuardPool } from './core/plugins/admin-guard.plugin';
+import tierGuardPlugin from './core/plugins/tier-guard.plugin';
 import loggingPlugin from './core/plugins/logging.plugin';
 import errorPlugin from './core/plugins/error.plugin';
 import { appConfig } from './core/config/config-loader';
@@ -24,12 +25,19 @@ import { documentsRoutes } from './features/documents/api/documents.routes';
 import { maintenanceRoutes } from './features/maintenance';
 import { platformRoutes } from './features/platform';
 import { adminRoutes } from './features/admin/api/admin.routes';
+import { auditLogRoutes } from './features/audit-log/api/audit-log.routes';
 import { notificationsRoutes } from './features/notifications';
 import { userProfileRoutes } from './features/user-profile';
 import { onboardingRoutes } from './features/onboarding';
 import { userPreferencesRoutes } from './features/user-preferences';
 import { userExportRoutes } from './features/user-export';
+import { userImportRoutes } from './features/user-import';
+import { ownershipCostsRoutes } from './features/ownership-costs';
+import { subscriptionsRoutes, donationsRoutes, webhooksRoutes } from './features/subscriptions';
+import { ocrRoutes } from './features/ocr';
+import { emailIngestionWebhookRoutes, emailIngestionRoutes } from './features/email-ingestion';
 import { pool } from './core/config/database';
+import { configRoutes } from './core/config/config.routes';

 async function buildApp(): Promise<FastifyInstance> {
  const app = Fastify({
@@ -80,13 +88,16 @@ async function buildApp(): Promise<FastifyInstance> {
  await app.register(adminGuardPlugin);
  setAdminGuardPool(pool);

+  // Tier guard plugin - for subscription tier enforcement
+  await app.register(tierGuardPlugin);
+
  // Health check
  app.get('/health', async (_request, reply) => {
    return reply.code(200).send({
      status: 'healthy',
      timestamp: new Date().toISOString(),
      environment: process.env['NODE_ENV'],
-      features: ['admin', 'auth', 'onboarding', 'vehicles', 'documents', 'fuel-logs', 'stations', 'maintenance', 'platform', 'notifications', 'user-profile', 'user-preferences', 'user-export']
+      features: ['admin', 'auth', 'config', 'onboarding', 'vehicles', 'documents', 'fuel-logs', 'stations', 'maintenance', 'platform', 'notifications', 'user-profile', 'user-preferences', 'user-export', 'user-import', 'ownership-costs', 'subscriptions', 'donations', 'ocr', 'email-ingestion']
    });
  });

@@ -96,7 +107,7 @@ async function buildApp(): Promise<FastifyInstance> {
      status: 'healthy',
      scope: 'api',
      timestamp: new Date().toISOString(),
-      features: ['admin', 'auth', 'onboarding', 'vehicles', 'documents', 'fuel-logs', 'stations', 'maintenance', 'platform', 'notifications', 'user-profile', 'user-preferences', 'user-export']
+      features: ['admin', 'auth', 'config', 'onboarding', 'vehicles', 'documents', 'fuel-logs', 'stations', 'maintenance', 'platform', 'notifications', 'user-profile', 'user-preferences', 'user-export', 'user-import', 'ownership-costs', 'subscriptions', 'donations', 'ocr', 'email-ingestion']
    });
  });

@@ -132,10 +143,20 @@ async function buildApp(): Promise<FastifyInstance> {
  await app.register(communityStationsRoutes, { prefix: '/api' });
  await app.register(maintenanceRoutes, { prefix: '/api' });
  await app.register(adminRoutes, { prefix: '/api' });
+  await app.register(auditLogRoutes, { prefix: '/api' });
  await app.register(notificationsRoutes, { prefix: '/api' });
  await app.register(userProfileRoutes, { prefix: '/api' });
  await app.register(userPreferencesRoutes, { prefix: '/api' });
  await app.register(userExportRoutes, { prefix: '/api' });
+  await app.register(userImportRoutes, { prefix: '/api' });
+  await app.register(ownershipCostsRoutes, { prefix: '/api' });
+  await app.register(subscriptionsRoutes, { prefix: '/api' });
+  await app.register(donationsRoutes, { prefix: '/api' });
+  await app.register(webhooksRoutes, { prefix: '/api' });
+  await app.register(emailIngestionWebhookRoutes, { prefix: '/api' });
+  await app.register(emailIngestionRoutes, { prefix: '/api' });
+  await app.register(ocrRoutes, { prefix: '/api' });
+  await app.register(configRoutes, { prefix: '/api' });

  // 404 handler
  app.setNotFoundHandler(async (_request, reply) => {
--- a/backend/src/core/CLAUDE.md
+++ b/backend/src/core/CLAUDE.md
@@ -11,10 +11,10 @@
 | Directory | What | When to read |
 | --------- | ---- | ------------ |
 | `auth/` | Authentication utilities | JWT handling, user context |
-| `config/` | Configuration loading (env, database, redis) | Environment setup, connection pools |
+| `config/` | Configuration loading (env, database, redis) and feature tier gating (fuelLog.receiptScan, document.scanMaintenanceSchedule, vehicle.vinDecode) | Environment setup, connection pools, tier requirements |
 | `logging/` | Winston structured logging | Log configuration, debugging |
 | `middleware/` | Fastify middleware | Request processing, user extraction |
-| `plugins/` | Fastify plugins (auth, error, logging) | Plugin registration, hooks |
+| `plugins/` | Fastify plugins (auth, error, logging, tier guard) | Plugin registration, hooks, tier gating |
 | `scheduler/` | Job scheduling infrastructure | Scheduled tasks, cron jobs |
 | `storage/` | Storage abstraction and adapters | File storage, S3/filesystem |
 | `user-preferences/` | User preferences data and migrations | User settings storage |
--- a/backend/src/core/config/config-loader.ts
+++ b/backend/src/core/config/config-loader.ts
@@ -41,14 +41,6 @@ const configSchema = z.object({
    audience: z.string(),
  }),

-  // External APIs configuration (optional)
-  external: z.object({
-    vpic: z.object({
-      url: z.string(),
-      timeout: z.string(),
-    }).optional(),
-  }).optional(),
-
  // Service configuration
  service: z.object({
    name: z.string(),
@@ -126,6 +118,10 @@ const secretsSchema = z.object({
  auth0_management_client_secret: z.string(),
  google_maps_api_key: z.string(),
  resend_api_key: z.string(),
+  resend_webhook_secret: z.string().optional(),
+  // Stripe secrets (API keys only - price IDs are config, not secrets)
+  stripe_secret_key: z.string(),
+  stripe_webhook_secret: z.string(),
 });

 type Config = z.infer<typeof configSchema>;
@@ -140,6 +136,14 @@ export interface AppConfiguration {
  getRedisUrl(): string;
  getAuth0Config(): { domain: string; audience: string; clientSecret: string };
  getAuth0ManagementConfig(): { domain: string; clientId: string; clientSecret: string };
+  getResendConfig(): {
+    apiKey: string;
+    webhookSecret: string | undefined;
+  };
+  getStripeConfig(): {
+    secretKey: string;
+    webhookSecret: string;
+  };
 }

 class ConfigurationLoader {
@@ -178,6 +182,9 @@ class ConfigurationLoader {
      'auth0-management-client-secret',
      'google-maps-api-key',
      'resend-api-key',
+      'resend-webhook-secret',
+      'stripe-secret-key',
+      'stripe-webhook-secret',
    ];

    for (const secretFile of secretFiles) {
@@ -240,10 +247,27 @@ class ConfigurationLoader {
          clientSecret: secrets.auth0_management_client_secret,
        };
      },
+
+      getResendConfig() {
+        return {
+          apiKey: secrets.resend_api_key,
+          webhookSecret: secrets.resend_webhook_secret,
+        };
+      },
+
+      getStripeConfig() {
+        return {
+          secretKey: secrets.stripe_secret_key,
+          webhookSecret: secrets.stripe_webhook_secret,
+        };
+      },
    };

-    // Set RESEND_API_KEY in environment for EmailService
+    // Set Resend environment variables for EmailService and webhook verification
    process.env['RESEND_API_KEY'] = secrets.resend_api_key;
+    if (secrets.resend_webhook_secret) {
+      process.env['RESEND_WEBHOOK_SECRET'] = secrets.resend_webhook_secret;
+    }

    logger.info('Configuration loaded successfully', {
      configSource: 'yaml',
--- a/backend/src/core/config/config.routes.ts
+++ b/backend/src/core/config/config.routes.ts
@@ -0,0 +1,18 @@
+/**
+ * @ai-summary Configuration API routes
+ * @ai-context Exposes feature tier configuration for frontend consumption
+ */
+
+import { FastifyPluginAsync } from 'fastify';
+import { getAllFeatureConfigs, TIER_LEVELS } from './feature-tiers';
+
+export const configRoutes: FastifyPluginAsync = async (fastify) => {
+  // GET /api/config/feature-tiers - Get all feature tier configurations
+  // Public endpoint - no auth required (config is not sensitive)
+  fastify.get('/config/feature-tiers', async (_request, reply) => {
+    return reply.code(200).send({
+      tiers: TIER_LEVELS,
+      features: getAllFeatureConfigs(),
+    });
+  });
+};
--- a/backend/src/core/config/feature-tiers.ts
+++ b/backend/src/core/config/feature-tiers.ts
@@ -0,0 +1,160 @@
+/**
+ * @ai-summary Feature tier configuration and utilities
+ * @ai-context Defines feature-to-tier mapping for gating premium features
+ */
+
+import { SubscriptionTier } from '../../features/user-profile/domain/user-profile.types';
+
+// Tier hierarchy: higher number = higher access level
+export const TIER_LEVELS: Record<SubscriptionTier, number> = {
+  free: 0,
+  pro: 1,
+  enterprise: 2,
+} as const;
+
+// Feature configuration interface
+export interface FeatureConfig {
+  minTier: SubscriptionTier;
+  name: string;
+  upgradePrompt: string;
+}
+
+// Feature registry - add new gated features here
+export const FEATURE_TIERS: Record<string, FeatureConfig> = {
+  'document.scanMaintenanceSchedule': {
+    minTier: 'pro',
+    name: 'Scan for Maintenance Schedule',
+    upgradePrompt: 'Upgrade to Pro to automatically extract maintenance schedules from your vehicle manuals.',
+  },
+  'vehicle.vinDecode': {
+    minTier: 'pro',
+    name: 'VIN Decode',
+    upgradePrompt: 'Upgrade to Pro to automatically decode VIN and populate vehicle details from the vehicle database.',
+  },
+  'fuelLog.receiptScan': {
+    minTier: 'pro',
+    name: 'Receipt Scan',
+    upgradePrompt: 'Upgrade to Pro to scan fuel receipts and auto-fill your fuel log entries.',
+  },
+  'maintenance.receiptScan': {
+    minTier: 'pro',
+    name: 'Maintenance Receipt Scan',
+    upgradePrompt: 'Upgrade to Pro to scan maintenance receipts and extract service details automatically.',
+  },
+} as const;
+
+/**
+ * Get numeric level for a subscription tier
+ */
+export function getTierLevel(tier: SubscriptionTier): number {
+  return TIER_LEVELS[tier] ?? 0;
+}
+
+/**
+ * Check if a user tier can access a feature
+ * Higher tiers inherit access to all lower tier features
+ */
+export function canAccessFeature(userTier: SubscriptionTier, featureKey: string): boolean {
+  const feature = FEATURE_TIERS[featureKey];
+  if (!feature) {
+    // Unknown features are accessible by all (fail open for unlisted features)
+    return true;
+  }
+  return getTierLevel(userTier) >= getTierLevel(feature.minTier);
+}
+
+/**
+ * Get the minimum required tier for a feature
+ * Returns null if feature is not gated
+ */
+export function getRequiredTier(featureKey: string): SubscriptionTier | null {
+  const feature = FEATURE_TIERS[featureKey];
+  return feature?.minTier ?? null;
+}
+
+/**
+ * Get full feature configuration
+ * Returns undefined if feature is not registered
+ */
+export function getFeatureConfig(featureKey: string): FeatureConfig | undefined {
+  return FEATURE_TIERS[featureKey];
+}
+
+/**
+ * Get all feature configurations (for API endpoint)
+ */
+export function getAllFeatureConfigs(): Record<string, FeatureConfig> {
+  return { ...FEATURE_TIERS };
+}
+
+// Vehicle limits per tier
+// null indicates unlimited (enterprise tier)
+export const VEHICLE_LIMITS: Record<SubscriptionTier, number | null> = {
+  free: 2,
+  pro: 5,
+  enterprise: null,
+} as const;
+
+/**
+ * Vehicle limits vary by subscription tier and must be queryable
+ * at runtime for both backend enforcement and frontend UI state.
+ *
+ * @param tier - User's subscription tier
+ * @returns Maximum vehicles allowed, or null for unlimited (enterprise tier)
+ */
+export function getVehicleLimit(tier: SubscriptionTier): number | null {
+  return VEHICLE_LIMITS[tier] ?? null;
+}
+
+/**
+ * Check if a user can add another vehicle based on their tier and current count.
+ *
+ * @param tier - User's subscription tier
+ * @param currentCount - Number of vehicles user currently has
+ * @returns true if user can add another vehicle, false if at/over limit
+ */
+export function canAddVehicle(tier: SubscriptionTier, currentCount: number): boolean {
+  const limit = getVehicleLimit(tier);
+  // null limit means unlimited (enterprise)
+  if (limit === null) {
+    return true;
+  }
+  return currentCount < limit;
+}
+
+/**
+ * Vehicle limit configuration with upgrade prompt.
+ * Structure supports additional resource types in the future.
+ */
+export interface VehicleLimitConfig {
+  limit: number | null;
+  tier: SubscriptionTier;
+  upgradePrompt: string;
+}
+
+/**
+ * Get vehicle limit configuration with upgrade prompt for a tier.
+ *
+ * @param tier - User's subscription tier
+ * @returns Configuration with limit and upgrade prompt
+ */
+export function getVehicleLimitConfig(tier: SubscriptionTier): VehicleLimitConfig {
+  const limit = getVehicleLimit(tier);
+
+  const defaultPrompt = 'Upgrade to access additional vehicles.';
+
+  let upgradePrompt: string;
+  if (tier === 'free') {
+    upgradePrompt = 'Free tier is limited to 2 vehicles. Upgrade to Pro for up to 5 vehicles, or Enterprise for unlimited.';
+  } else if (tier === 'pro') {
+    upgradePrompt = 'Pro tier is limited to 5 vehicles. Upgrade to Enterprise for unlimited vehicles.';
+  } else {
+    upgradePrompt = defaultPrompt;
+  }
+
+  return {
+    limit,
+    tier,
+    upgradePrompt,
+  };
+}
--- a/backend/src/core/config/tests/feature-tiers.test.ts
+++ b/backend/src/core/config/tests/feature-tiers.test.ts
@@ -0,0 +1,225 @@
+import {
+  TIER_LEVELS,
+  FEATURE_TIERS,
+  VEHICLE_LIMITS,
+  getTierLevel,
+  canAccessFeature,
+  getRequiredTier,
+  getFeatureConfig,
+  getAllFeatureConfigs,
+  getVehicleLimit,
+  canAddVehicle,
+  getVehicleLimitConfig,
+} from '../feature-tiers';
+
+describe('feature-tiers', () => {
+  describe('TIER_LEVELS', () => {
+    it('defines correct tier hierarchy', () => {
+      expect(TIER_LEVELS.free).toBe(0);
+      expect(TIER_LEVELS.pro).toBe(1);
+      expect(TIER_LEVELS.enterprise).toBe(2);
+    });
+
+    it('enterprise > pro > free', () => {
+      expect(TIER_LEVELS.enterprise).toBeGreaterThan(TIER_LEVELS.pro);
+      expect(TIER_LEVELS.pro).toBeGreaterThan(TIER_LEVELS.free);
+    });
+  });
+
+  describe('FEATURE_TIERS', () => {
+    it('includes scanMaintenanceSchedule feature', () => {
+      const feature = FEATURE_TIERS['document.scanMaintenanceSchedule'];
+      expect(feature).toBeDefined();
+      expect(feature.minTier).toBe('pro');
+      expect(feature.name).toBe('Scan for Maintenance Schedule');
+      expect(feature.upgradePrompt).toBeTruthy();
+    });
+
+    it('includes fuelLog.receiptScan feature', () => {
+      const feature = FEATURE_TIERS['fuelLog.receiptScan'];
+      expect(feature).toBeDefined();
+      expect(feature.minTier).toBe('pro');
+      expect(feature.name).toBe('Receipt Scan');
+      expect(feature.upgradePrompt).toBeTruthy();
+    });
+  });
+
+  describe('canAccessFeature - fuelLog.receiptScan', () => {
+    const featureKey = 'fuelLog.receiptScan';
+
+    it('denies access for free tier user', () => {
+      expect(canAccessFeature('free', featureKey)).toBe(false);
+    });
+
+    it('allows access for pro tier user', () => {
+      expect(canAccessFeature('pro', featureKey)).toBe(true);
+    });
+
+    it('allows access for enterprise tier user (inherits pro)', () => {
+      expect(canAccessFeature('enterprise', featureKey)).toBe(true);
+    });
+  });
+
+  describe('getTierLevel', () => {
+    it('returns correct level for each tier', () => {
+      expect(getTierLevel('free')).toBe(0);
+      expect(getTierLevel('pro')).toBe(1);
+      expect(getTierLevel('enterprise')).toBe(2);
+    });
+
+    it('returns 0 for unknown tier', () => {
+      expect(getTierLevel('unknown' as any)).toBe(0);
+    });
+  });
+
+  describe('canAccessFeature', () => {
+    const featureKey = 'document.scanMaintenanceSchedule';
+
+    it('denies access for free tier to pro feature', () => {
+      expect(canAccessFeature('free', featureKey)).toBe(false);
+    });
+
+    it('allows access for pro tier to pro feature', () => {
+      expect(canAccessFeature('pro', featureKey)).toBe(true);
+    });
+
+    it('allows access for enterprise tier to pro feature (inheritance)', () => {
+      expect(canAccessFeature('enterprise', featureKey)).toBe(true);
+    });
+
+    it('allows access for unknown feature (fail open)', () => {
+      expect(canAccessFeature('free', 'unknown.feature')).toBe(true);
+      expect(canAccessFeature('pro', 'unknown.feature')).toBe(true);
+      expect(canAccessFeature('enterprise', 'unknown.feature')).toBe(true);
+    });
+  });
+
+  describe('getRequiredTier', () => {
+    it('returns required tier for known feature', () => {
+      expect(getRequiredTier('document.scanMaintenanceSchedule')).toBe('pro');
+    });
+
+    it('returns null for unknown feature', () => {
+      expect(getRequiredTier('unknown.feature')).toBeNull();
+    });
+  });
+
+  describe('getFeatureConfig', () => {
+    it('returns full config for known feature', () => {
+      const config = getFeatureConfig('document.scanMaintenanceSchedule');
+      expect(config).toEqual({
+        minTier: 'pro',
+        name: 'Scan for Maintenance Schedule',
+        upgradePrompt: expect.any(String),
+      });
+    });
+
+    it('returns undefined for unknown feature', () => {
+      expect(getFeatureConfig('unknown.feature')).toBeUndefined();
+    });
+  });
+
+  describe('getAllFeatureConfigs', () => {
+    it('returns copy of all feature configs', () => {
+      const configs = getAllFeatureConfigs();
+      expect(configs['document.scanMaintenanceSchedule']).toBeDefined();
+
+      // Verify it's a copy, not the original
+      configs['test'] = { minTier: 'free', name: 'test', upgradePrompt: '' };
+      expect(FEATURE_TIERS['test' as keyof typeof FEATURE_TIERS]).toBeUndefined();
+    });
+  });
+
+  describe('VEHICLE_LIMITS', () => {
+    it('defines correct limits for each tier', () => {
+      expect(VEHICLE_LIMITS.free).toBe(2);
+      expect(VEHICLE_LIMITS.pro).toBe(5);
+      expect(VEHICLE_LIMITS.enterprise).toBeNull();
+    });
+  });
+
+  describe('getVehicleLimit', () => {
+    it('returns 2 for free tier', () => {
+      expect(getVehicleLimit('free')).toBe(2);
+    });
+
+    it('returns 5 for pro tier', () => {
+      expect(getVehicleLimit('pro')).toBe(5);
+    });
+
+    it('returns null for enterprise tier (unlimited)', () => {
+      expect(getVehicleLimit('enterprise')).toBeNull();
+    });
+  });
+
+  describe('canAddVehicle', () => {
+    describe('free tier (limit 2)', () => {
+      it('returns true when below limit', () => {
+        expect(canAddVehicle('free', 0)).toBe(true);
+        expect(canAddVehicle('free', 1)).toBe(true);
+      });
+
+      it('returns false when at limit', () => {
+        expect(canAddVehicle('free', 2)).toBe(false);
+      });
+
+      it('returns false when over limit', () => {
+        expect(canAddVehicle('free', 3)).toBe(false);
+      });
+    });
+
+    describe('pro tier (limit 5)', () => {
+      it('returns true when below limit', () => {
+        expect(canAddVehicle('pro', 0)).toBe(true);
+        expect(canAddVehicle('pro', 4)).toBe(true);
+      });
+
+      it('returns false when at limit', () => {
+        expect(canAddVehicle('pro', 5)).toBe(false);
+      });
+
+      it('returns false when over limit', () => {
+        expect(canAddVehicle('pro', 6)).toBe(false);
+      });
+    });
+
+    describe('enterprise tier (unlimited)', () => {
+      it('always returns true regardless of count', () => {
+        expect(canAddVehicle('enterprise', 0)).toBe(true);
+        expect(canAddVehicle('enterprise', 100)).toBe(true);
+        expect(canAddVehicle('enterprise', 999999)).toBe(true);
+      });
+    });
+  });
+
+  describe('getVehicleLimitConfig', () => {
+    it('returns correct config for free tier', () => {
+      const config = getVehicleLimitConfig('free');
+      expect(config.limit).toBe(2);
+      expect(config.tier).toBe('free');
+      expect(config.upgradePrompt).toContain('Free tier is limited to 2 vehicles');
+      expect(config.upgradePrompt).toContain('Pro');
+      expect(config.upgradePrompt).toContain('Enterprise');
+    });
+
+    it('returns correct config for pro tier', () => {
+      const config = getVehicleLimitConfig('pro');
+      expect(config.limit).toBe(5);
+      expect(config.tier).toBe('pro');
+      expect(config.upgradePrompt).toContain('Pro tier is limited to 5 vehicles');
+      expect(config.upgradePrompt).toContain('Enterprise');
+    });
+
+    it('returns correct config for enterprise tier', () => {
+      const config = getVehicleLimitConfig('enterprise');
+      expect(config.limit).toBeNull();
+      expect(config.tier).toBe('enterprise');
+      expect(config.upgradePrompt).toBeTruthy();
+    });
+
+    it('provides default upgradePrompt fallback', () => {
+      const config = getVehicleLimitConfig('enterprise');
+      expect(config.upgradePrompt).toBe('Upgrade to access additional vehicles.');
+    });
+  });
+});
--- a/backend/src/core/identity-migration/migrations/001_migrate_user_id_to_uuid.sql
+++ b/backend/src/core/identity-migration/migrations/001_migrate_user_id_to_uuid.sql
@@ -0,0 +1,404 @@
+-- Migration: 001_migrate_user_id_to_uuid.sql
+-- Feature: identity-migration (cross-cutting)
+-- Description: Migrate all user identity columns from VARCHAR(255) storing auth0_sub
+--              to UUID referencing user_profiles.id. Admin tables restructured with UUID PKs.
+-- Requires: All feature tables must exist (runs last in MIGRATION_ORDER)
+
+BEGIN;
+
+-- ============================================================================
+-- PHASE 1: Add new UUID columns alongside existing VARCHAR columns
+-- ============================================================================
+
+-- 1a. Feature tables (17 tables with user_id VARCHAR)
+ALTER TABLE vehicles ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE fuel_logs ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE maintenance_records ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE maintenance_schedules ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE documents ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE notification_logs ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE user_notifications ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE user_preferences ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE saved_stations ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE audit_logs ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE ownership_costs ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE email_ingestion_queue ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE pending_vehicle_associations ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE subscriptions ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE donations ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE tier_vehicle_selections ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+ALTER TABLE terms_agreements ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+
+-- 1b. Special user-reference columns (submitted_by/reported_by store auth0_sub)
+ALTER TABLE community_stations ADD COLUMN IF NOT EXISTS submitted_by_uuid UUID;
+ALTER TABLE station_removal_reports ADD COLUMN IF NOT EXISTS reported_by_uuid UUID;
+
+-- 1c. Admin table: add id UUID and user_profile_id UUID
+ALTER TABLE admin_users ADD COLUMN IF NOT EXISTS id UUID;
+ALTER TABLE admin_users ADD COLUMN IF NOT EXISTS user_profile_id UUID;
+
+-- 1d. Admin-referencing columns: add UUID equivalents
+ALTER TABLE admin_audit_logs ADD COLUMN IF NOT EXISTS actor_admin_uuid UUID;
+ALTER TABLE admin_audit_logs ADD COLUMN IF NOT EXISTS target_admin_uuid UUID;
+ALTER TABLE admin_users ADD COLUMN IF NOT EXISTS created_by_uuid UUID;
+ALTER TABLE community_stations ADD COLUMN IF NOT EXISTS reviewed_by_uuid UUID;
+ALTER TABLE backup_history ADD COLUMN IF NOT EXISTS created_by_uuid UUID;
+ALTER TABLE platform_change_log ADD COLUMN IF NOT EXISTS changed_by_uuid UUID;
+ALTER TABLE user_profiles ADD COLUMN IF NOT EXISTS deactivated_by_uuid UUID;
+
+
+-- ============================================================================
+-- PHASE 2: Backfill UUID values from user_profiles join
+-- ============================================================================
+
+-- 2a. Feature tables: map user_id (auth0_sub) -> user_profiles.id (UUID)
+UPDATE vehicles SET user_profile_id = up.id
+  FROM user_profiles up WHERE vehicles.user_id = up.auth0_sub AND vehicles.user_profile_id IS NULL;
+
+UPDATE fuel_logs SET user_profile_id = up.id
+  FROM user_profiles up WHERE fuel_logs.user_id = up.auth0_sub AND fuel_logs.user_profile_id IS NULL;
+
+UPDATE maintenance_records SET user_profile_id = up.id
+  FROM user_profiles up WHERE maintenance_records.user_id = up.auth0_sub AND maintenance_records.user_profile_id IS NULL;
+
+UPDATE maintenance_schedules SET user_profile_id = up.id
+  FROM user_profiles up WHERE maintenance_schedules.user_id = up.auth0_sub AND maintenance_schedules.user_profile_id IS NULL;
+
+UPDATE documents SET user_profile_id = up.id
+  FROM user_profiles up WHERE documents.user_id = up.auth0_sub AND documents.user_profile_id IS NULL;
+
+UPDATE notification_logs SET user_profile_id = up.id
+  FROM user_profiles up WHERE notification_logs.user_id = up.auth0_sub AND notification_logs.user_profile_id IS NULL;
+
+UPDATE user_notifications SET user_profile_id = up.id
+  FROM user_profiles up WHERE user_notifications.user_id = up.auth0_sub AND user_notifications.user_profile_id IS NULL;
+
+UPDATE user_preferences SET user_profile_id = up.id
+  FROM user_profiles up WHERE user_preferences.user_id = up.auth0_sub AND user_preferences.user_profile_id IS NULL;
+
+-- 2a-fix. user_preferences has rows where user_id already contains user_profiles.id (UUID)
+-- instead of auth0_sub. Match these directly by casting to UUID.
+UPDATE user_preferences SET user_profile_id = up.id
+  FROM user_profiles up
+  WHERE user_preferences.user_id ~ '^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$'
+    AND user_preferences.user_id::uuid = up.id
+    AND user_preferences.user_profile_id IS NULL;
+
+-- Delete truly orphaned user_preferences (UUID user_id with no matching user_profile)
+DELETE FROM user_preferences
+  WHERE user_profile_id IS NULL
+    AND user_id ~ '^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$'
+    AND NOT EXISTS (SELECT 1 FROM user_profiles WHERE id = user_preferences.user_id::uuid);
+
+-- Deduplicate user_preferences: same user may have both an auth0_sub row and
+-- a UUID row, both now mapping to the same user_profile_id. Keep the newest.
+DELETE FROM user_preferences a
+  USING user_preferences b
+  WHERE a.user_profile_id = b.user_profile_id
+    AND a.user_profile_id IS NOT NULL
+    AND (a.updated_at < b.updated_at OR (a.updated_at = b.updated_at AND a.id < b.id));
+
+UPDATE saved_stations SET user_profile_id = up.id
+  FROM user_profiles up WHERE saved_stations.user_id = up.auth0_sub AND saved_stations.user_profile_id IS NULL;
+
+UPDATE audit_logs SET user_profile_id = up.id
+  FROM user_profiles up WHERE audit_logs.user_id = up.auth0_sub AND audit_logs.user_profile_id IS NULL;
+
+UPDATE ownership_costs SET user_profile_id = up.id
+  FROM user_profiles up WHERE ownership_costs.user_id = up.auth0_sub AND ownership_costs.user_profile_id IS NULL;
+
+UPDATE email_ingestion_queue SET user_profile_id = up.id
+  FROM user_profiles up WHERE email_ingestion_queue.user_id = up.auth0_sub AND email_ingestion_queue.user_profile_id IS NULL;
+
+UPDATE pending_vehicle_associations SET user_profile_id = up.id
+  FROM user_profiles up WHERE pending_vehicle_associations.user_id = up.auth0_sub AND pending_vehicle_associations.user_profile_id IS NULL;
+
+UPDATE subscriptions SET user_profile_id = up.id
+  FROM user_profiles up WHERE subscriptions.user_id = up.auth0_sub AND subscriptions.user_profile_id IS NULL;
+
+UPDATE donations SET user_profile_id = up.id
+  FROM user_profiles up WHERE donations.user_id = up.auth0_sub AND donations.user_profile_id IS NULL;
+
+UPDATE tier_vehicle_selections SET user_profile_id = up.id
+  FROM user_profiles up WHERE tier_vehicle_selections.user_id = up.auth0_sub AND tier_vehicle_selections.user_profile_id IS NULL;
+
+UPDATE terms_agreements SET user_profile_id = up.id
+  FROM user_profiles up WHERE terms_agreements.user_id = up.auth0_sub AND terms_agreements.user_profile_id IS NULL;
+
+-- 2b. Special user columns
+UPDATE community_stations SET submitted_by_uuid = up.id
+  FROM user_profiles up WHERE community_stations.submitted_by = up.auth0_sub AND community_stations.submitted_by_uuid IS NULL;
+
+UPDATE station_removal_reports SET reported_by_uuid = up.id
+  FROM user_profiles up WHERE station_removal_reports.reported_by = up.auth0_sub AND station_removal_reports.reported_by_uuid IS NULL;
+
+
+-- ============================================================================
+-- PHASE 3: Admin-specific transformations
+-- ============================================================================
+
+-- 3a. Create user_profiles entries for any admin_users that lack one
+INSERT INTO user_profiles (auth0_sub, email)
+SELECT au.auth0_sub, au.email
+FROM admin_users au
+WHERE NOT EXISTS (
+  SELECT 1 FROM user_profiles up WHERE up.auth0_sub = au.auth0_sub
+)
+ON CONFLICT (auth0_sub) DO NOTHING;
+
+-- 3b. Populate admin_users.id (DEFAULT doesn't auto-fill on ALTER ADD COLUMN for existing rows)
+UPDATE admin_users SET id = uuid_generate_v4() WHERE id IS NULL;
+
+-- 3c. Backfill admin_users.user_profile_id from user_profiles join
+UPDATE admin_users SET user_profile_id = up.id
+  FROM user_profiles up WHERE admin_users.auth0_sub = up.auth0_sub AND admin_users.user_profile_id IS NULL;
+
+-- 3d. Backfill admin-referencing columns: map auth0_sub -> admin_users.id UUID
+UPDATE admin_audit_logs SET actor_admin_uuid = au.id
+  FROM admin_users au WHERE admin_audit_logs.actor_admin_id = au.auth0_sub AND admin_audit_logs.actor_admin_uuid IS NULL;
+
+UPDATE admin_audit_logs SET target_admin_uuid = au.id
+  FROM admin_users au WHERE admin_audit_logs.target_admin_id = au.auth0_sub AND admin_audit_logs.target_admin_uuid IS NULL;
+
+UPDATE admin_users au SET created_by_uuid = creator.id
+  FROM admin_users creator WHERE au.created_by = creator.auth0_sub AND au.created_by_uuid IS NULL;
+
+UPDATE community_stations SET reviewed_by_uuid = au.id
+  FROM admin_users au WHERE community_stations.reviewed_by = au.auth0_sub AND community_stations.reviewed_by_uuid IS NULL;
+
+UPDATE backup_history SET created_by_uuid = au.id
+  FROM admin_users au WHERE backup_history.created_by = au.auth0_sub AND backup_history.created_by_uuid IS NULL;
+
+UPDATE platform_change_log SET changed_by_uuid = au.id
+  FROM admin_users au WHERE platform_change_log.changed_by = au.auth0_sub AND platform_change_log.changed_by_uuid IS NULL;
+
+UPDATE user_profiles SET deactivated_by_uuid = au.id
+  FROM admin_users au WHERE user_profiles.deactivated_by = au.auth0_sub AND user_profiles.deactivated_by_uuid IS NULL;
+
+
+-- ============================================================================
+-- PHASE 4: Add constraints
+-- ============================================================================
+
+-- 4a. Set NOT NULL on feature table UUID columns (audit_logs stays nullable)
+ALTER TABLE vehicles ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE fuel_logs ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE maintenance_records ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE maintenance_schedules ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE documents ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE notification_logs ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE user_notifications ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE user_preferences ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE saved_stations ALTER COLUMN user_profile_id SET NOT NULL;
+-- audit_logs.user_profile_id stays NULLABLE (system actions have no user)
+ALTER TABLE ownership_costs ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE email_ingestion_queue ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE pending_vehicle_associations ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE subscriptions ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE donations ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE tier_vehicle_selections ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE terms_agreements ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE community_stations ALTER COLUMN submitted_by_uuid SET NOT NULL;
+ALTER TABLE station_removal_reports ALTER COLUMN reported_by_uuid SET NOT NULL;
+
+-- 4b. Admin table NOT NULL constraints
+ALTER TABLE admin_users ALTER COLUMN id SET NOT NULL;
+ALTER TABLE admin_users ALTER COLUMN user_profile_id SET NOT NULL;
+ALTER TABLE admin_audit_logs ALTER COLUMN actor_admin_uuid SET NOT NULL;
+-- target_admin_uuid stays nullable (some actions have no target)
+-- created_by_uuid stays nullable (bootstrap admin may not have a creator)
+ALTER TABLE platform_change_log ALTER COLUMN changed_by_uuid SET NOT NULL;
+
+-- 4c. Admin table PK transformation
+ALTER TABLE admin_users DROP CONSTRAINT admin_users_pkey;
+ALTER TABLE admin_users ADD PRIMARY KEY (id);
+
+-- 4d. Add FK constraints to user_profiles(id) with ON DELETE CASCADE
+ALTER TABLE vehicles ADD CONSTRAINT fk_vehicles_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE fuel_logs ADD CONSTRAINT fk_fuel_logs_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE maintenance_records ADD CONSTRAINT fk_maintenance_records_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE maintenance_schedules ADD CONSTRAINT fk_maintenance_schedules_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE documents ADD CONSTRAINT fk_documents_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE notification_logs ADD CONSTRAINT fk_notification_logs_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE user_notifications ADD CONSTRAINT fk_user_notifications_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE user_preferences ADD CONSTRAINT fk_user_preferences_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE saved_stations ADD CONSTRAINT fk_saved_stations_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE audit_logs ADD CONSTRAINT fk_audit_logs_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE ownership_costs ADD CONSTRAINT fk_ownership_costs_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE email_ingestion_queue ADD CONSTRAINT fk_email_ingestion_queue_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE pending_vehicle_associations ADD CONSTRAINT fk_pending_vehicle_assoc_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE subscriptions ADD CONSTRAINT fk_subscriptions_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE donations ADD CONSTRAINT fk_donations_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE tier_vehicle_selections ADD CONSTRAINT fk_tier_vehicle_selections_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE terms_agreements ADD CONSTRAINT fk_terms_agreements_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE community_stations ADD CONSTRAINT fk_community_stations_submitted_by
+  FOREIGN KEY (submitted_by_uuid) REFERENCES user_profiles(id) ON DELETE CASCADE;
+ALTER TABLE station_removal_reports ADD CONSTRAINT fk_station_removal_reports_reported_by
+  FOREIGN KEY (reported_by_uuid) REFERENCES user_profiles(id) ON DELETE CASCADE;
+
+-- 4e. Admin FK constraints
+ALTER TABLE admin_users ADD CONSTRAINT fk_admin_users_user_profile_id
+  FOREIGN KEY (user_profile_id) REFERENCES user_profiles(id);
+ALTER TABLE admin_users ADD CONSTRAINT uq_admin_users_user_profile_id
+  UNIQUE (user_profile_id);
+
+
+-- ============================================================================
+-- PHASE 5: Drop old columns, rename new ones, recreate indexes
+-- ============================================================================
+
+-- 5a. Drop old FK constraints on VARCHAR user_id columns
+ALTER TABLE subscriptions DROP CONSTRAINT IF EXISTS fk_subscriptions_user_id;
+ALTER TABLE donations DROP CONSTRAINT IF EXISTS fk_donations_user_id;
+ALTER TABLE tier_vehicle_selections DROP CONSTRAINT IF EXISTS fk_tier_vehicle_selections_user_id;
+
+-- 5b. Drop old UNIQUE constraints involving VARCHAR columns
+ALTER TABLE vehicles DROP CONSTRAINT IF EXISTS unique_user_vin;
+ALTER TABLE saved_stations DROP CONSTRAINT IF EXISTS unique_user_station;
+ALTER TABLE user_preferences DROP CONSTRAINT IF EXISTS user_preferences_user_id_key;
+ALTER TABLE station_removal_reports DROP CONSTRAINT IF EXISTS unique_user_station_report;
+
+-- 5c. Drop old indexes on VARCHAR columns
+DROP INDEX IF EXISTS idx_vehicles_user_id;
+DROP INDEX IF EXISTS idx_fuel_logs_user_id;
+DROP INDEX IF EXISTS idx_maintenance_records_user_id;
+DROP INDEX IF EXISTS idx_maintenance_schedules_user_id;
+DROP INDEX IF EXISTS idx_documents_user_id;
+DROP INDEX IF EXISTS idx_documents_user_vehicle;
+DROP INDEX IF EXISTS idx_notification_logs_user_id;
+DROP INDEX IF EXISTS idx_user_notifications_user_id;
+DROP INDEX IF EXISTS idx_user_notifications_unread;
+DROP INDEX IF EXISTS idx_user_preferences_user_id;
+DROP INDEX IF EXISTS idx_saved_stations_user_id;
+DROP INDEX IF EXISTS idx_audit_logs_user_created;
+DROP INDEX IF EXISTS idx_ownership_costs_user_id;
+DROP INDEX IF EXISTS idx_email_ingestion_queue_user_id;
+DROP INDEX IF EXISTS idx_pending_vehicle_assoc_user_id;
+DROP INDEX IF EXISTS idx_subscriptions_user_id;
+DROP INDEX IF EXISTS idx_donations_user_id;
+DROP INDEX IF EXISTS idx_tier_vehicle_selections_user_id;
+DROP INDEX IF EXISTS idx_terms_agreements_user_id;
+DROP INDEX IF EXISTS idx_community_stations_submitted_by;
+DROP INDEX IF EXISTS idx_removal_reports_reported_by;
+DROP INDEX IF EXISTS idx_admin_audit_logs_actor_id;
+DROP INDEX IF EXISTS idx_admin_audit_logs_target_id;
+DROP INDEX IF EXISTS idx_platform_change_log_changed_by;
+
+-- 5d. Drop old VARCHAR user_id columns from feature tables
+ALTER TABLE vehicles DROP COLUMN user_id;
+ALTER TABLE fuel_logs DROP COLUMN user_id;
+ALTER TABLE maintenance_records DROP COLUMN user_id;
+ALTER TABLE maintenance_schedules DROP COLUMN user_id;
+ALTER TABLE documents DROP COLUMN user_id;
+ALTER TABLE notification_logs DROP COLUMN user_id;
+ALTER TABLE user_notifications DROP COLUMN user_id;
+ALTER TABLE user_preferences DROP COLUMN user_id;
+ALTER TABLE saved_stations DROP COLUMN user_id;
+ALTER TABLE audit_logs DROP COLUMN user_id;
+ALTER TABLE ownership_costs DROP COLUMN user_id;
+ALTER TABLE email_ingestion_queue DROP COLUMN user_id;
+ALTER TABLE pending_vehicle_associations DROP COLUMN user_id;
+ALTER TABLE subscriptions DROP COLUMN user_id;
+ALTER TABLE donations DROP COLUMN user_id;
+ALTER TABLE tier_vehicle_selections DROP COLUMN user_id;
+ALTER TABLE terms_agreements DROP COLUMN user_id;
+
+-- 5e. Rename user_profile_id -> user_id in feature tables
+ALTER TABLE vehicles RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE fuel_logs RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE maintenance_records RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE maintenance_schedules RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE documents RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE notification_logs RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE user_notifications RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE user_preferences RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE saved_stations RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE audit_logs RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE ownership_costs RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE email_ingestion_queue RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE pending_vehicle_associations RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE subscriptions RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE donations RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE tier_vehicle_selections RENAME COLUMN user_profile_id TO user_id;
+ALTER TABLE terms_agreements RENAME COLUMN user_profile_id TO user_id;
+
+-- 5f. Drop and rename special user columns
+ALTER TABLE community_stations DROP COLUMN submitted_by;
+ALTER TABLE community_stations RENAME COLUMN submitted_by_uuid TO submitted_by;
+ALTER TABLE station_removal_reports DROP COLUMN reported_by;
+ALTER TABLE station_removal_reports RENAME COLUMN reported_by_uuid TO reported_by;
+
+-- 5g. Drop and rename admin-referencing columns
+ALTER TABLE admin_users DROP COLUMN auth0_sub;
+ALTER TABLE admin_users DROP COLUMN created_by;
+ALTER TABLE admin_users RENAME COLUMN created_by_uuid TO created_by;
+
+ALTER TABLE admin_audit_logs DROP COLUMN actor_admin_id;
+ALTER TABLE admin_audit_logs DROP COLUMN target_admin_id;
+ALTER TABLE admin_audit_logs RENAME COLUMN actor_admin_uuid TO actor_admin_id;
+ALTER TABLE admin_audit_logs RENAME COLUMN target_admin_uuid TO target_admin_id;
+
+ALTER TABLE community_stations DROP COLUMN reviewed_by;
+ALTER TABLE community_stations RENAME COLUMN reviewed_by_uuid TO reviewed_by;
+
+ALTER TABLE backup_history DROP COLUMN created_by;
+ALTER TABLE backup_history RENAME COLUMN created_by_uuid TO created_by;
+
+ALTER TABLE platform_change_log DROP COLUMN changed_by;
+ALTER TABLE platform_change_log RENAME COLUMN changed_by_uuid TO changed_by;
+
+ALTER TABLE user_profiles DROP COLUMN deactivated_by;
+ALTER TABLE user_profiles RENAME COLUMN deactivated_by_uuid TO deactivated_by;
+
+-- 5h. Recreate indexes on new UUID columns (feature tables)
+CREATE INDEX idx_vehicles_user_id ON vehicles(user_id);
+CREATE INDEX idx_fuel_logs_user_id ON fuel_logs(user_id);
+CREATE INDEX idx_maintenance_records_user_id ON maintenance_records(user_id);
+CREATE INDEX idx_maintenance_schedules_user_id ON maintenance_schedules(user_id);
+CREATE INDEX idx_documents_user_id ON documents(user_id);
+CREATE INDEX idx_documents_user_vehicle ON documents(user_id, vehicle_id);
+CREATE INDEX idx_notification_logs_user_id ON notification_logs(user_id);
+CREATE INDEX idx_user_notifications_user_id ON user_notifications(user_id);
+CREATE INDEX idx_user_notifications_unread ON user_notifications(user_id, created_at DESC) WHERE is_read = false;
+CREATE INDEX idx_user_preferences_user_id ON user_preferences(user_id);
+CREATE INDEX idx_saved_stations_user_id ON saved_stations(user_id);
+CREATE INDEX idx_audit_logs_user_created ON audit_logs(user_id, created_at DESC);
+CREATE INDEX idx_ownership_costs_user_id ON ownership_costs(user_id);
+CREATE INDEX idx_email_ingestion_queue_user_id ON email_ingestion_queue(user_id);
+CREATE INDEX idx_pending_vehicle_assoc_user_id ON pending_vehicle_associations(user_id);
+CREATE INDEX idx_subscriptions_user_id ON subscriptions(user_id);
+CREATE INDEX idx_donations_user_id ON donations(user_id);
+CREATE INDEX idx_tier_vehicle_selections_user_id ON tier_vehicle_selections(user_id);
+CREATE INDEX idx_terms_agreements_user_id ON terms_agreements(user_id);
+
+-- 5i. Recreate indexes on special columns
+CREATE INDEX idx_community_stations_submitted_by ON community_stations(submitted_by);
+CREATE INDEX idx_removal_reports_reported_by ON station_removal_reports(reported_by);
+CREATE INDEX idx_admin_audit_logs_actor_id ON admin_audit_logs(actor_admin_id);
+CREATE INDEX idx_admin_audit_logs_target_id ON admin_audit_logs(target_admin_id);
+CREATE INDEX idx_platform_change_log_changed_by ON platform_change_log(changed_by);
+
+-- 5j. Recreate UNIQUE constraints on new UUID columns
+ALTER TABLE vehicles ADD CONSTRAINT unique_user_vin UNIQUE(user_id, vin);
+ALTER TABLE saved_stations ADD CONSTRAINT unique_user_station UNIQUE(user_id, place_id);
+ALTER TABLE user_preferences ADD CONSTRAINT user_preferences_user_id_key UNIQUE(user_id);
+ALTER TABLE station_removal_reports ADD CONSTRAINT unique_user_station_report UNIQUE(station_id, reported_by);
+
+COMMIT;
--- a/backend/src/core/logging/logger.ts
+++ b/backend/src/core/logging/logger.ts
@@ -1,24 +1,42 @@
 /**
- * @ai-summary Structured logging with Winston
- * @ai-context All features use this for consistent logging
+ * @ai-summary Structured logging with Pino (Winston-compatible wrapper)
+ * @ai-context All features use this for consistent logging. API maintains Winston compatibility.
 */
-import * as winston from 'winston';
+import pino from 'pino';

-export const logger = winston.createLogger({
-  level: 'info',
-  format: winston.format.combine(
-    winston.format.timestamp(),
-    winston.format.errors({ stack: true }),
-    winston.format.json()
-  ),
-  defaultMeta: {
-    service: 'motovaultpro-backend',
+type LogLevel = 'debug' | 'info' | 'warn' | 'error';
+const validLevels: LogLevel[] = ['debug', 'info', 'warn', 'error'];
+
+const rawLevel = (process.env.LOG_LEVEL?.toLowerCase() || 'info') as LogLevel;
+const level = validLevels.includes(rawLevel) ? rawLevel : 'info';
+
+if (process.env.LOG_LEVEL && rawLevel !== level) {
+  console.warn(`Invalid LOG_LEVEL "${process.env.LOG_LEVEL}", falling back to "info"`);
+}
+
+const pinoLogger = pino({
+  level,
+  formatters: {
+    level: (label) => ({ level: label }),
  },
-  transports: [
-    new winston.transports.Console({
-      format: winston.format.json(),
-    }),
-  ],
+  timestamp: pino.stdTimeFunctions.isoTime,
 });

-export default logger;
+// Wrapper maintains logger.info(msg, meta) API for backward compatibility
+export const logger = {
+  info: (msg: string, meta?: object) => pinoLogger.info(meta || {}, msg),
+  warn: (msg: string, meta?: object) => pinoLogger.warn(meta || {}, msg),
+  error: (msg: string, meta?: object) => pinoLogger.error(meta || {}, msg),
+  debug: (msg: string, meta?: object) => pinoLogger.debug(meta || {}, msg),
+  child: (bindings: object) => {
+    const childPino = pinoLogger.child(bindings);
+    return {
+      info: (msg: string, meta?: object) => childPino.info(meta || {}, msg),
+      warn: (msg: string, meta?: object) => childPino.warn(meta || {}, msg),
+      error: (msg: string, meta?: object) => childPino.error(meta || {}, msg),
+      debug: (msg: string, meta?: object) => childPino.debug(meta || {}, msg),
+    };
+  },
+};
+
+export default logger;
--- a/backend/src/core/middleware/require-tier.test.ts
+++ b/backend/src/core/middleware/require-tier.test.ts
@@ -0,0 +1,191 @@
+import { FastifyRequest, FastifyReply } from 'fastify';
+import { requireTier } from './require-tier';
+
+// Mock logger to suppress output during tests
+jest.mock('../logging/logger', () => ({
+  logger: {
+    error: jest.fn(),
+    warn: jest.fn(),
+    debug: jest.fn(),
+    info: jest.fn(),
+  },
+}));
+
+const createRequest = (subscriptionTier?: string): Partial<FastifyRequest> => {
+  if (subscriptionTier === undefined) {
+    return { userContext: undefined };
+  }
+  return {
+    userContext: {
+      userId: '550e8400-e29b-41d4-a716-446655440000',
+      email: 'user@example.com',
+      emailVerified: true,
+      onboardingCompleted: true,
+      isAdmin: false,
+      subscriptionTier: subscriptionTier as any,
+    },
+  };
+};
+
+const createReply = (): Partial<FastifyReply> & { statusCode?: number; payload?: unknown } => {
+  const reply: any = {
+    sent: false,
+    code: jest.fn(function (this: any, status: number) {
+      this.statusCode = status;
+      return this;
+    }),
+    send: jest.fn(function (this: any, payload: unknown) {
+      this.payload = payload;
+      this.sent = true;
+      return this;
+    }),
+  };
+  return reply;
+};
+
+describe('requireTier middleware', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('pro user passes fuelLog.receiptScan check', () => {
+    it('allows pro user through without sending a response', async () => {
+      const handler = requireTier('fuelLog.receiptScan');
+      const request = createRequest('pro');
+      const reply = createReply();
+
+      await handler(request as FastifyRequest, reply as FastifyReply);
+
+      expect(reply.code).not.toHaveBeenCalled();
+      expect(reply.send).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('enterprise user passes all checks (tier inheritance)', () => {
+    it('allows enterprise user access to pro-gated features', async () => {
+      const handler = requireTier('fuelLog.receiptScan');
+      const request = createRequest('enterprise');
+      const reply = createReply();
+
+      await handler(request as FastifyRequest, reply as FastifyReply);
+
+      expect(reply.code).not.toHaveBeenCalled();
+      expect(reply.send).not.toHaveBeenCalled();
+    });
+
+    it('allows enterprise user access to document.scanMaintenanceSchedule', async () => {
+      const handler = requireTier('document.scanMaintenanceSchedule');
+      const request = createRequest('enterprise');
+      const reply = createReply();
+
+      await handler(request as FastifyRequest, reply as FastifyReply);
+
+      expect(reply.code).not.toHaveBeenCalled();
+      expect(reply.send).not.toHaveBeenCalled();
+    });
+
+    it('allows enterprise user access to vehicle.vinDecode', async () => {
+      const handler = requireTier('vehicle.vinDecode');
+      const request = createRequest('enterprise');
+      const reply = createReply();
+
+      await handler(request as FastifyRequest, reply as FastifyReply);
+
+      expect(reply.code).not.toHaveBeenCalled();
+      expect(reply.send).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('free user blocked with 403 and correct response body', () => {
+    it('blocks free user from fuelLog.receiptScan', async () => {
+      const handler = requireTier('fuelLog.receiptScan');
+      const request = createRequest('free');
+      const reply = createReply();
+
+      await handler(request as FastifyRequest, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(403);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'TIER_REQUIRED',
+          requiredTier: 'pro',
+          currentTier: 'free',
+          featureName: 'Receipt Scan',
+          upgradePrompt: expect.any(String),
+        }),
+      );
+    });
+
+    it('blocks free user from document.scanMaintenanceSchedule', async () => {
+      const handler = requireTier('document.scanMaintenanceSchedule');
+      const request = createRequest('free');
+      const reply = createReply();
+
+      await handler(request as FastifyRequest, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(403);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'TIER_REQUIRED',
+          requiredTier: 'pro',
+          currentTier: 'free',
+          featureName: 'Scan for Maintenance Schedule',
+          upgradePrompt: expect.any(String),
+        }),
+      );
+    });
+
+    it('response body includes all required fields', async () => {
+      const handler = requireTier('fuelLog.receiptScan');
+      const request = createRequest('free');
+      const reply = createReply();
+
+      await handler(request as FastifyRequest, reply as FastifyReply);
+
+      const body = (reply.send as jest.Mock).mock.calls[0][0];
+      expect(body).toHaveProperty('requiredTier', 'pro');
+      expect(body).toHaveProperty('currentTier', 'free');
+      expect(body).toHaveProperty('featureName', 'Receipt Scan');
+      expect(body).toHaveProperty('upgradePrompt');
+      expect(typeof body.upgradePrompt).toBe('string');
+      expect(body.upgradePrompt.length).toBeGreaterThan(0);
+    });
+  });
+
+  describe('unknown feature key returns 500', () => {
+    it('returns 500 INTERNAL_ERROR for unregistered feature', async () => {
+      const handler = requireTier('unknown.nonexistent.feature');
+      const request = createRequest('pro');
+      const reply = createReply();
+
+      await handler(request as FastifyRequest, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(500);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'INTERNAL_ERROR',
+          message: 'Unknown feature configuration',
+        }),
+      );
+    });
+  });
+
+  describe('missing user.tier on request returns 403', () => {
+    it('defaults to free tier when userContext is undefined', async () => {
+      const handler = requireTier('fuelLog.receiptScan');
+      const request = createRequest(); // no tier = undefined userContext
+      const reply = createReply();
+
+      await handler(request as FastifyRequest, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(403);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'TIER_REQUIRED',
+          currentTier: 'free',
+          requiredTier: 'pro',
+        }),
+      );
+    });
+  });
+});
--- a/backend/src/core/middleware/require-tier.ts
+++ b/backend/src/core/middleware/require-tier.ts
@@ -0,0 +1,64 @@
+/**
+ * @ai-summary Standalone tier guard middleware for route-level feature gating
+ * @ai-context Returns a Fastify preHandler that checks user subscription tier against feature requirements.
+ *   Must be composed AFTER requireAuth in preHandler arrays.
+ */
+
+import { FastifyRequest, FastifyReply } from 'fastify';
+import { canAccessFeature, getFeatureConfig } from '../config/feature-tiers';
+import { logger } from '../logging/logger';
+
+/**
+ * Creates a preHandler middleware that enforces subscription tier requirements.
+ *
+ * Reads the user's tier from request.userContext.subscriptionTier (set by auth middleware).
+ * Must be placed AFTER requireAuth in the preHandler chain.
+ *
+ * Usage:
+ *   fastify.post('/premium-route', {
+ *     preHandler: [requireAuth, requireTier('fuelLog.receiptScan')],
+ *     handler: controller.method
+ *   });
+ *
+ * @param featureKey - Key from FEATURE_TIERS registry (e.g. 'fuelLog.receiptScan')
+ * @returns Fastify preHandler function
+ */
+export function requireTier(featureKey: string) {
+  return async (request: FastifyRequest, reply: FastifyReply): Promise<void> => {
+    // Validate feature key exists in registry
+    const featureConfig = getFeatureConfig(featureKey);
+    if (!featureConfig) {
+      logger.error('requireTier: unknown feature key', { featureKey });
+      return reply.code(500).send({
+        error: 'INTERNAL_ERROR',
+        message: 'Unknown feature configuration',
+      });
+    }
+
+    // Get user tier from userContext (populated by auth middleware)
+    const currentTier = request.userContext?.subscriptionTier || 'free';
+
+    if (!canAccessFeature(currentTier, featureKey)) {
+      logger.warn('requireTier: access denied', {
+        userId: request.userContext?.userId?.substring(0, 8) + '...',
+        currentTier,
+        requiredTier: featureConfig.minTier,
+        featureKey,
+      });
+
+      return reply.code(403).send({
+        error: 'TIER_REQUIRED',
+        requiredTier: featureConfig.minTier,
+        currentTier,
+        featureName: featureConfig.name,
+        upgradePrompt: featureConfig.upgradePrompt,
+      });
+    }
+
+    logger.debug('requireTier: access granted', {
+      userId: request.userContext?.userId?.substring(0, 8) + '...',
+      currentTier,
+      featureKey,
+    });
+  };
+}
--- a/backend/src/core/plugins/admin-guard.plugin.ts
+++ b/backend/src/core/plugins/admin-guard.plugin.ts
@@ -58,9 +58,9 @@ const adminGuardPlugin: FastifyPluginAsync = async (fastify) => {

      // Check if user is in admin_users table and not revoked
      const query = `
-        SELECT auth0_sub, email, role, revoked_at
+        SELECT id, user_profile_id, email, role, revoked_at
        FROM admin_users
-        WHERE auth0_sub = $1 AND revoked_at IS NULL
+        WHERE user_profile_id = $1 AND revoked_at IS NULL
        LIMIT 1
      `;

--- a/backend/src/core/plugins/auth.plugin.ts
+++ b/backend/src/core/plugins/auth.plugin.ts
@@ -12,6 +12,7 @@ import { logger } from '../logging/logger';
 import { UserProfileRepository } from '../../features/user-profile/data/user-profile.repository';
 import { pool } from '../config/database';
 import { auth0ManagementClient } from '../auth/auth0-management.client';
+import { SubscriptionTier } from '../../features/user-profile/domain/user-profile.types';

 // Routes that don't require email verification
 const VERIFICATION_EXEMPT_ROUTES = [
@@ -56,6 +57,7 @@ declare module 'fastify' {
      onboardingCompleted: boolean;
      isAdmin: boolean;
      adminRecord?: any;
+      subscriptionTier: SubscriptionTier;
    };
  }
 }
@@ -119,43 +121,48 @@ const authPlugin: FastifyPluginAsync = async (fastify) => {
    try {
      await request.jwtVerify();

-      const userId = request.user?.sub;
-      if (!userId) {
+      // Two identifiers: auth0Sub (external, for Auth0 API) and userId (internal UUID, for all DB operations)
+      const auth0Sub = request.user?.sub;
+      if (!auth0Sub) {
        throw new Error('Missing user ID in JWT');
      }

+      let userId: string = auth0Sub; // Default to auth0Sub; overwritten with UUID after profile load
+
      // Get or create user profile from database
      let email = request.user?.email;
      let displayName: string | undefined;
      let emailVerified = false;
      let onboardingCompleted = false;
+      let subscriptionTier: SubscriptionTier = 'free';

      try {
        // If JWT doesn't have email, fetch from Auth0 Management API
        if (!email || email.includes('@unknown.local')) {
          try {
-            const auth0User = await auth0ManagementClient.getUser(userId);
+            const auth0User = await auth0ManagementClient.getUser(auth0Sub);
            if (auth0User.email) {
              email = auth0User.email;
              emailVerified = auth0User.emailVerified;
              logger.info('Fetched email from Auth0 Management API', {
-                userId: userId.substring(0, 8) + '...',
+                userId: auth0Sub.substring(0, 8) + '...',
                hasEmail: true,
              });
            }
          } catch (auth0Error) {
            logger.warn('Failed to fetch user from Auth0 Management API', {
-              userId: userId.substring(0, 8) + '...',
+              userId: auth0Sub.substring(0, 8) + '...',
              error: auth0Error instanceof Error ? auth0Error.message : 'Unknown error',
            });
          }
        }

        // Get or create profile with correct email
-        const profile = await profileRepo.getOrCreate(userId, {
-          email: email || `${userId}@unknown.local`,
+        const profile = await profileRepo.getOrCreate(auth0Sub, {
+          email: email || `${auth0Sub}@unknown.local`,
          displayName: request.user?.name || request.user?.nickname,
        });
+        userId = profile.id;

        // If profile has placeholder email but we now have real email, update it
        if (profile.email.includes('@unknown.local') && email && !email.includes('@unknown.local')) {
@@ -170,11 +177,12 @@ const authPlugin: FastifyPluginAsync = async (fastify) => {
        displayName = profile.displayName || undefined;
        emailVerified = profile.emailVerified;
        onboardingCompleted = profile.onboardingCompletedAt !== null;
+        subscriptionTier = profile.subscriptionTier || 'free';

        // Sync email verification status from Auth0 if needed
        if (!emailVerified) {
          try {
-            const isVerifiedInAuth0 = await auth0ManagementClient.checkEmailVerified(userId);
+            const isVerifiedInAuth0 = await auth0ManagementClient.checkEmailVerified(auth0Sub);
            if (isVerifiedInAuth0 && !profile.emailVerified) {
              await profileRepo.updateEmailVerified(userId, true);
              emailVerified = true;
@@ -193,7 +201,7 @@ const authPlugin: FastifyPluginAsync = async (fastify) => {
      } catch (profileError) {
        // Log but don't fail auth if profile fetch fails
        logger.warn('Failed to fetch user profile', {
-          userId: userId.substring(0, 8) + '...',
+          userId: auth0Sub.substring(0, 8) + '...',
          error: profileError instanceof Error ? profileError.message : 'Unknown error',
        });
        // Fall back to JWT email if available
@@ -208,6 +216,7 @@ const authPlugin: FastifyPluginAsync = async (fastify) => {
        emailVerified,
        onboardingCompleted,
        isAdmin: false, // Default to false; admin status checked by admin guard
+        subscriptionTier,
      };

      // Email verification guard - block unverified users from non-exempt routes
--- a/backend/src/core/plugins/logging.plugin.ts
+++ b/backend/src/core/plugins/logging.plugin.ts
@@ -1,20 +1,24 @@
 /**
- * @ai-summary Fastify request logging plugin
- * @ai-context Logs request/response details with timing
+ * @ai-summary Fastify request logging plugin with correlation IDs
+ * @ai-context Logs request/response details with timing and requestId
 */
 import { FastifyPluginAsync } from 'fastify';
 import fp from 'fastify-plugin';
+import { randomUUID } from 'crypto';
 import { logger } from '../logging/logger';

 const loggingPlugin: FastifyPluginAsync = async (fastify) => {
  fastify.addHook('onRequest', async (request) => {
    request.startTime = Date.now();
+    // Extract X-Request-Id from Traefik or generate new UUID
+    request.requestId = (request.headers['x-request-id'] as string) || randomUUID();
  });

  fastify.addHook('onResponse', async (request, reply) => {
    const duration = Date.now() - (request.startTime || Date.now());
-    
+
    logger.info('Request processed', {
+      requestId: request.requestId,
      method: request.method,
      path: request.url,
      status: reply.statusCode,
@@ -24,13 +28,13 @@ const loggingPlugin: FastifyPluginAsync = async (fastify) => {
  });
 };

-// Augment FastifyRequest to include startTime
 declare module 'fastify' {
  interface FastifyRequest {
    startTime?: number;
+    requestId?: string;
  }
 }

 export default fp(loggingPlugin, {
  name: 'logging-plugin'
-});
+});
--- a/backend/src/core/plugins/tests/tier-guard.plugin.test.ts
+++ b/backend/src/core/plugins/tests/tier-guard.plugin.test.ts
@@ -0,0 +1,205 @@
+import Fastify, { FastifyInstance, FastifyRequest, FastifyReply } from 'fastify';
+import tierGuardPlugin from '../tier-guard.plugin';
+
+const createReply = (): Partial<FastifyReply> & { payload?: unknown; statusCode?: number } => {
+  return {
+    sent: false,
+    code: jest.fn(function(this: any, status: number) {
+      this.statusCode = status;
+      return this;
+    }),
+    send: jest.fn(function(this: any, payload: unknown) {
+      this.payload = payload;
+      this.sent = true;
+      return this;
+    }),
+  };
+};
+
+describe('tier guard plugin', () => {
+  let fastify: FastifyInstance;
+  let authenticateMock: jest.Mock;
+
+  beforeEach(async () => {
+    fastify = Fastify();
+
+    // Mock authenticate to set userContext
+    authenticateMock = jest.fn(async (request: FastifyRequest) => {
+      request.userContext = {
+        userId: '550e8400-e29b-41d4-a716-446655440000',
+        email: 'user@example.com',
+        emailVerified: true,
+        onboardingCompleted: true,
+        isAdmin: false,
+        subscriptionTier: 'free',
+      };
+    });
+    fastify.decorate('authenticate', authenticateMock);
+
+    await fastify.register(tierGuardPlugin);
+  });
+
+  afterEach(async () => {
+    await fastify.close();
+    jest.clearAllMocks();
+  });
+
+  describe('requireTier with minTier', () => {
+    it('allows access when user tier meets minimum', async () => {
+      authenticateMock.mockImplementation(async (request: FastifyRequest) => {
+        request.userContext = {
+          userId: '550e8400-e29b-41d4-a716-446655440000',
+          email: 'user@example.com',
+          emailVerified: true,
+          onboardingCompleted: true,
+          isAdmin: false,
+          subscriptionTier: 'pro',
+        };
+      });
+
+      const request = {} as FastifyRequest;
+      const reply = createReply();
+
+      const handler = fastify.requireTier({ minTier: 'pro' });
+      await handler(request, reply as FastifyReply);
+
+      expect(authenticateMock).toHaveBeenCalledTimes(1);
+      expect(reply.code).not.toHaveBeenCalled();
+      expect(reply.send).not.toHaveBeenCalled();
+    });
+
+    it('allows access when user tier exceeds minimum', async () => {
+      authenticateMock.mockImplementation(async (request: FastifyRequest) => {
+        request.userContext = {
+          userId: '550e8400-e29b-41d4-a716-446655440000',
+          email: 'user@example.com',
+          emailVerified: true,
+          onboardingCompleted: true,
+          isAdmin: false,
+          subscriptionTier: 'enterprise',
+        };
+      });
+
+      const request = {} as FastifyRequest;
+      const reply = createReply();
+
+      const handler = fastify.requireTier({ minTier: 'pro' });
+      await handler(request, reply as FastifyReply);
+
+      expect(reply.code).not.toHaveBeenCalled();
+    });
+
+    it('denies access when user tier is below minimum', async () => {
+      const request = {} as FastifyRequest;
+      const reply = createReply();
+
+      const handler = fastify.requireTier({ minTier: 'pro' });
+      await handler(request, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(403);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'TIER_REQUIRED',
+          requiredTier: 'pro',
+          currentTier: 'free',
+        })
+      );
+    });
+  });
+
+  describe('requireTier with featureKey', () => {
+    it('denies free tier access to pro feature', async () => {
+      const request = {} as FastifyRequest;
+      const reply = createReply();
+
+      const handler = fastify.requireTier({ featureKey: 'document.scanMaintenanceSchedule' });
+      await handler(request, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(403);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'TIER_REQUIRED',
+          requiredTier: 'pro',
+          currentTier: 'free',
+          feature: 'document.scanMaintenanceSchedule',
+          featureName: 'Scan for Maintenance Schedule',
+        })
+      );
+    });
+
+    it('allows pro tier access to pro feature', async () => {
+      authenticateMock.mockImplementation(async (request: FastifyRequest) => {
+        request.userContext = {
+          userId: '550e8400-e29b-41d4-a716-446655440000',
+          email: 'user@example.com',
+          emailVerified: true,
+          onboardingCompleted: true,
+          isAdmin: false,
+          subscriptionTier: 'pro',
+        };
+      });
+
+      const request = {} as FastifyRequest;
+      const reply = createReply();
+
+      const handler = fastify.requireTier({ featureKey: 'document.scanMaintenanceSchedule' });
+      await handler(request, reply as FastifyReply);
+
+      expect(reply.code).not.toHaveBeenCalled();
+    });
+
+    it('allows access for unknown feature (fail open)', async () => {
+      const request = {} as FastifyRequest;
+      const reply = createReply();
+
+      const handler = fastify.requireTier({ featureKey: 'unknown.feature' });
+      await handler(request, reply as FastifyReply);
+
+      expect(reply.code).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('error handling', () => {
+    it('returns 500 when authenticate handler is not a function', async () => {
+      const brokenFastify = Fastify();
+      // Decorate with a non-function value to simulate missing handler
+      brokenFastify.decorate('authenticate', 'not-a-function' as any);
+      await brokenFastify.register(tierGuardPlugin);
+
+      const request = {} as FastifyRequest;
+      const reply = createReply();
+
+      const handler = brokenFastify.requireTier({ minTier: 'pro' });
+      await handler(request, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(500);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'Internal server error',
+          message: 'Authentication handler missing',
+        })
+      );
+
+      await brokenFastify.close();
+    });
+
+    it('defaults to free tier when userContext is missing', async () => {
+      authenticateMock.mockImplementation(async () => {
+        // Don't set userContext
+      });
+
+      const request = {} as FastifyRequest;
+      const reply = createReply();
+
+      const handler = fastify.requireTier({ minTier: 'pro' });
+      await handler(request, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(403);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          currentTier: 'free',
+        })
+      );
+    });
+  });
+});
--- a/backend/src/core/plugins/tier-guard.plugin.ts
+++ b/backend/src/core/plugins/tier-guard.plugin.ts
@@ -0,0 +1,126 @@
+/**
+ * @ai-summary Fastify tier authorization plugin
+ * @ai-context Enforces subscription tier requirements for protected routes
+ */
+
+import { FastifyPluginAsync, FastifyRequest, FastifyReply, FastifyInstance } from 'fastify';
+import fp from 'fastify-plugin';
+import { logger } from '../logging/logger';
+import { SubscriptionTier } from '../../features/user-profile/domain/user-profile.types';
+import { canAccessFeature, getFeatureConfig, getTierLevel } from '../config/feature-tiers';
+
+// Tier check options
+export interface TierCheckOptions {
+  minTier?: SubscriptionTier;
+  featureKey?: string;
+}
+
+declare module 'fastify' {
+  interface FastifyInstance {
+    requireTier: (options: TierCheckOptions) => (request: FastifyRequest, reply: FastifyReply) => Promise<void>;
+  }
+}
+
+const tierGuardPlugin: FastifyPluginAsync = async (fastify) => {
+  /**
+   * Creates a preHandler that enforces tier requirements
+   *
+   * Usage:
+   *   fastify.get('/premium-route', {
+   *     preHandler: [fastify.requireTier({ minTier: 'pro' })],
+   *     handler: controller.method
+   *   });
+   *
+   * Or with feature key:
+   *   fastify.post('/documents', {
+   *     preHandler: [fastify.requireTier({ featureKey: 'document.scanMaintenanceSchedule' })],
+   *     handler: controller.method
+   *   });
+   */
+  fastify.decorate('requireTier', function(this: FastifyInstance, options: TierCheckOptions) {
+    const { minTier, featureKey } = options;
+
+    return async (request: FastifyRequest, reply: FastifyReply): Promise<void> => {
+      try {
+        // Ensure user is authenticated first
+        if (typeof this.authenticate !== 'function') {
+          logger.error('Tier guard: authenticate handler missing');
+          return reply.code(500).send({
+            error: 'Internal server error',
+            message: 'Authentication handler missing',
+          });
+        }
+
+        await this.authenticate(request, reply);
+        if (reply.sent) {
+          return;
+        }
+
+        // Get user's subscription tier from context
+        const userTier = request.userContext?.subscriptionTier || 'free';
+
+        // Determine required tier and check access
+        let hasAccess = false;
+        let requiredTier: SubscriptionTier = 'free';
+        let upgradePrompt: string | undefined;
+        let featureName: string | undefined;
+
+        if (featureKey) {
+          // Feature-based tier check
+          hasAccess = canAccessFeature(userTier, featureKey);
+          const config = getFeatureConfig(featureKey);
+          requiredTier = config?.minTier || 'pro';
+          upgradePrompt = config?.upgradePrompt;
+          featureName = config?.name;
+        } else if (minTier) {
+          // Direct tier comparison
+          hasAccess = getTierLevel(userTier) >= getTierLevel(minTier);
+          requiredTier = minTier;
+        } else {
+          // No tier requirement specified - allow access
+          hasAccess = true;
+        }
+
+        if (!hasAccess) {
+          logger.warn('Tier guard: user tier insufficient', {
+            userId: request.userContext?.userId?.substring(0, 8) + '...',
+            userTier,
+            requiredTier,
+            featureKey,
+          });
+
+          return reply.code(403).send({
+            error: 'TIER_REQUIRED',
+            requiredTier,
+            currentTier: userTier,
+            feature: featureKey || null,
+            featureName: featureName || null,
+            upgradePrompt: upgradePrompt || `Upgrade to ${requiredTier} to access this feature.`,
+          });
+        }
+
+        logger.debug('Tier guard: access granted', {
+          userId: request.userContext?.userId?.substring(0, 8) + '...',
+          userTier,
+          featureKey,
+        });
+      } catch (error) {
+        logger.error('Tier guard: authorization check failed', {
+          error: error instanceof Error ? error.message : 'Unknown error',
+          userId: request.userContext?.userId?.substring(0, 8) + '...',
+        });
+
+        return reply.code(500).send({
+          error: 'Internal server error',
+          message: 'Tier check failed',
+        });
+      }
+    };
+  });
+};
+
+export default fp(tierGuardPlugin, {
+  name: 'tier-guard-plugin',
+  // Note: Requires auth-plugin to be registered first for authenticate decorator
+  // Dependency check removed to allow testing with mock authenticate
+});
--- a/backend/src/core/scheduler/index.ts
+++ b/backend/src/core/scheduler/index.ts
@@ -15,6 +15,14 @@ import {
  processBackupRetention,
  setBackupCleanupJobPool,
 } from '../../features/backup/jobs/backup-cleanup.job';
+import {
+  processAuditLogCleanup,
+  setAuditLogCleanupJobPool,
+} from '../../features/audit-log/jobs/cleanup.job';
+import {
+  processGracePeriodExpirations,
+  setGracePeriodJobPool,
+} from '../../features/subscriptions/jobs/grace-period.job';
 import { pool } from '../config/database';

 let schedulerInitialized = false;
@@ -31,6 +39,12 @@ export function initializeScheduler(): void {
  setBackupJobPool(pool);
  setBackupCleanupJobPool(pool);

+  // Initialize audit log cleanup job pool
+  setAuditLogCleanupJobPool(pool);
+
+  // Initialize grace period job pool
+  setGracePeriodJobPool(pool);
+
  // Daily notification processing at 8 AM
  cron.schedule('0 8 * * *', async () => {
    logger.info('Running scheduled notification job');
@@ -60,6 +74,23 @@ export function initializeScheduler(): void {
    }
  });

+  // Grace period expiration check at 2:30 AM daily
+  cron.schedule('30 2 * * *', async () => {
+    logger.info('Running grace period expiration job');
+    try {
+      const result = await processGracePeriodExpirations();
+      logger.info('Grace period job completed', {
+        processed: result.processed,
+        downgraded: result.downgraded,
+        errors: result.errors.length,
+      });
+    } catch (error) {
+      logger.error('Grace period job failed', {
+        error: error instanceof Error ? error.message : String(error)
+      });
+    }
+  });
+
  // Check for scheduled backups every minute
  cron.schedule('* * * * *', async () => {
    logger.debug('Checking for scheduled backups');
@@ -90,8 +121,30 @@ export function initializeScheduler(): void {
    }
  });

+  // Audit log retention cleanup at 3 AM daily (90-day retention)
+  cron.schedule('0 3 * * *', async () => {
+    logger.info('Running audit log cleanup job');
+    try {
+      const result = await processAuditLogCleanup();
+      if (result.success) {
+        logger.info('Audit log cleanup job completed', {
+          deletedCount: result.deletedCount,
+          retentionDays: result.retentionDays,
+        });
+      } else {
+        logger.error('Audit log cleanup job failed', {
+          error: result.error,
+        });
+      }
+    } catch (error) {
+      logger.error('Audit log cleanup job failed', {
+        error: error instanceof Error ? error.message : String(error)
+      });
+    }
+  });
+
  schedulerInitialized = true;
-  logger.info('Cron scheduler initialized - notification (8 AM), account purge (2 AM), backup check (every min), retention cleanup (4 AM)');
+  logger.info('Cron scheduler initialized - notification (8 AM), account purge (2 AM), grace period (2:30 AM), audit log cleanup (3 AM), backup check (every min), retention cleanup (4 AM)');
 }

 export function isSchedulerInitialized(): boolean {
--- a/backend/src/features/CLAUDE.md
+++ b/backend/src/features/CLAUDE.md
@@ -1,23 +1,26 @@
 # backend/src/features/

-Feature capsule directory. Each feature is 100% self-contained with api/, domain/, data/, migrations/, tests/.
-
 ## Subdirectories

 | Directory | What | When to read |
 | --------- | ---- | ------------ |
 | `admin/` | Admin role management, catalog CRUD | Admin functionality, user oversight |
+| `audit-log/` | Centralized audit logging | Cross-feature event logging, admin logs UI |
 | `auth/` | Authentication endpoints | Login, logout, session management |
 | `backup/` | Database backup and restore | Backup jobs, data export/import |
 | `documents/` | Document storage and management | File uploads, document handling |
 | `fuel-logs/` | Fuel consumption tracking | Fuel log CRUD, statistics |
 | `maintenance/` | Maintenance record management | Service records, reminders |
 | `notifications/` | Email and push notifications | Alert system, email templates |
+| `ocr/` | OCR proxy to mvp-ocr service (VIN, receipt, manual extraction) | Image text extraction, receipt scanning, manual PDF extraction, async jobs |
 | `onboarding/` | User onboarding flow | First-time user setup |
+| `ownership-costs/` | Ownership cost tracking and reports | Cost aggregation, expense analysis |
 | `platform/` | Vehicle data and VIN decoding | Make/model lookup, VIN validation |
 | `stations/` | Gas station search and favorites | Google Maps integration, station data |
+| `subscriptions/` | Stripe payment and billing | Subscription tiers, donations, webhooks |
 | `terms-agreement/` | Terms & Conditions acceptance audit | Signup T&C, legal compliance |
 | `user-export/` | User data export | GDPR compliance, data portability |
+| `user-import/` | User data import | Restore from backup, data migration |
 | `user-preferences/` | User preference management | User settings API |
 | `user-profile/` | User profile management | Profile CRUD, avatar handling |
 | `vehicles/` | Vehicle management | Vehicle CRUD, fleet operations |
--- a/backend/src/features/admin/CLAUDE.md
+++ b/backend/src/features/admin/CLAUDE.md
@@ -0,0 +1,18 @@
+# admin/
+
+## Files
+
+| File | What | When to read |
+| ---- | ---- | ------------ |
+| `README.md` | Feature documentation | Understanding admin functionality |
+
+## Subdirectories
+
+| Directory | What | When to read |
+| --------- | ---- | ------------ |
+| `api/` | HTTP endpoints and routes | API changes |
+| `domain/` | Business logic, services, types | Core admin logic |
+| `data/` | Repository, database queries | Database operations |
+| `migrations/` | Database schema | Schema changes |
+| `scripts/` | Admin utility scripts | Admin automation |
+| `tests/` | Unit and integration tests | Adding or modifying tests |
--- a/backend/src/features/admin/README.md
+++ b/backend/src/features/admin/README.md
@@ -62,14 +62,56 @@ Provides:
 - `admin-guard` plugin - Authorization enforcement (decorator on Fastify)
 - `request.userContext` - Enhanced with `isAdmin`, `adminRecord`

-### Phase 2: Admin Management APIs
+### Admin Dashboard Stats

-Will provide:
- `/api/admin/admins` - List all admins (GET)
- `/api/admin/admins` - Add admin (POST)
- `/api/admin/admins/:auth0Sub/revoke` - Revoke admin (PATCH)
- `/api/admin/admins/:auth0Sub/reinstate` - Reinstate admin (PATCH)
- `/api/admin/audit-logs` - View audit trail (GET)
+Provides admin dashboard statistics:
+
+- `GET /api/admin/stats` - Get total users and vehicles counts
+
+**Response:**
+```json
+{
+  "totalUsers": 150,
+  "totalVehicles": 287
+}
+```
+
+### User Management APIs
+
+Provides:
+- `GET /api/admin/users` - List all users with pagination/filters
+- `GET /api/admin/users/:auth0Sub` - Get single user details
+- `GET /api/admin/users/:auth0Sub/vehicles` - Get user's vehicles (admin view)
+- `PATCH /api/admin/users/:auth0Sub/tier` - Update subscription tier
+- `PATCH /api/admin/users/:auth0Sub/deactivate` - Deactivate user
+- `PATCH /api/admin/users/:auth0Sub/reactivate` - Reactivate user
+- `PATCH /api/admin/users/:auth0Sub/profile` - Update user profile
+- `PATCH /api/admin/users/:auth0Sub/promote` - Promote to admin
+- `DELETE /api/admin/users/:auth0Sub` - Hard delete user (GDPR)
+
+**User Vehicles Endpoint:**
+```
+GET /api/admin/users/:auth0Sub/vehicles
+```
+
+Returns minimal vehicle data for privacy (Year/Make/Model only):
+```json
+{
+  "vehicles": [
+    { "year": 2022, "make": "Toyota", "model": "Camry" },
+    { "year": 2020, "make": "Honda", "model": "Civic" }
+  ]
+}
+```
+
+### Admin Management APIs
+
+Provides:
+- `GET /api/admin/admins` - List all admins
+- `POST /api/admin/admins` - Add admin
+- `PATCH /api/admin/admins/:auth0Sub/revoke` - Revoke admin
+- `PATCH /api/admin/admins/:auth0Sub/reinstate` - Reinstate admin
+- `GET /api/admin/audit-logs` - View audit trail

 ### Phase 3: Platform Catalog CRUD (COMPLETED)

--- a/backend/src/features/admin/api/admin.controller.ts
+++ b/backend/src/features/admin/api/admin.controller.ts
@@ -6,11 +6,12 @@
 import { FastifyRequest, FastifyReply } from 'fastify';
 import { AdminService } from '../domain/admin.service';
 import { AdminRepository } from '../data/admin.repository';
+import { UserProfileRepository } from '../../user-profile/data/user-profile.repository';
 import { pool } from '../../../core/config/database';
 import { logger } from '../../../core/logging/logger';
 import {
  CreateAdminInput,
-  AdminAuth0SubInput,
+  AdminIdInput,
  AuditLogsQueryInput,
  BulkCreateAdminInput,
  BulkRevokeAdminInput,
@@ -18,7 +19,7 @@ import {
 } from './admin.validation';
 import {
  createAdminSchema,
-  adminAuth0SubSchema,
+  adminIdSchema,
  auditLogsQuerySchema,
  bulkCreateAdminSchema,
  bulkRevokeAdminSchema,
@@ -33,10 +34,12 @@ import {

 export class AdminController {
  private adminService: AdminService;
+  private userProfileRepository: UserProfileRepository;

  constructor() {
    const repository = new AdminRepository(pool);
    this.adminService = new AdminService(repository);
+    this.userProfileRepository = new UserProfileRepository(pool);
  }

  /**
@@ -47,49 +50,18 @@ export class AdminController {
      const userId = request.userContext?.userId;
      const userEmail = this.resolveUserEmail(request);

-      console.log('[DEBUG] Admin verify - userId:', userId);
-      console.log('[DEBUG] Admin verify - userEmail:', userEmail);
-
      if (userEmail && request.userContext) {
        request.userContext.email = userEmail.toLowerCase();
      }

-      if (!userId && !userEmail) {
-        console.log('[DEBUG] Admin verify - No userId or userEmail, returning 401');
+      if (!userId) {
        return reply.code(401).send({
          error: 'Unauthorized',
          message: 'User context missing'
        });
      }

-      let adminRecord = userId
-        ? await this.adminService.getAdminByAuth0Sub(userId)
-        : null;
-
-      console.log('[DEBUG] Admin verify - adminRecord by auth0Sub:', adminRecord ? 'FOUND' : 'NOT FOUND');
-
-      // Fallback: attempt to resolve admin by email for legacy records
-      if (!adminRecord && userEmail) {
-        const emailMatch = await this.adminService.getAdminByEmail(userEmail.toLowerCase());
-
-        console.log('[DEBUG] Admin verify - emailMatch:', emailMatch ? 'FOUND' : 'NOT FOUND');
-        if (emailMatch) {
-          console.log('[DEBUG] Admin verify - emailMatch.auth0Sub:', emailMatch.auth0Sub);
-          console.log('[DEBUG] Admin verify - emailMatch.revokedAt:', emailMatch.revokedAt);
-        }
-
-        if (emailMatch && !emailMatch.revokedAt) {
-          // If the stored auth0Sub differs, link it to the authenticated user
-          if (userId && emailMatch.auth0Sub !== userId) {
-            console.log('[DEBUG] Admin verify - Calling linkAdminAuth0Sub to update auth0Sub');
-            adminRecord = await this.adminService.linkAdminAuth0Sub(userEmail, userId);
-            console.log('[DEBUG] Admin verify - adminRecord after link:', adminRecord ? 'SUCCESS' : 'FAILED');
-          } else {
-            console.log('[DEBUG] Admin verify - Using emailMatch as adminRecord');
-            adminRecord = emailMatch;
-          }
-        }
-      }
+      const adminRecord = await this.adminService.getAdminByUserProfileId(userId);

      if (adminRecord && !adminRecord.revokedAt) {
        if (request.userContext) {
@@ -97,12 +69,11 @@ export class AdminController {
          request.userContext.adminRecord = adminRecord;
        }

-        console.log('[DEBUG] Admin verify - Returning isAdmin: true');
-        // User is an active admin
        return reply.code(200).send({
          isAdmin: true,
          adminRecord: {
-            auth0Sub: adminRecord.auth0Sub,
+            id: adminRecord.id,
+            userProfileId: adminRecord.userProfileId,
            email: adminRecord.email,
            role: adminRecord.role
          }
@@ -114,14 +85,11 @@ export class AdminController {
        request.userContext.adminRecord = undefined;
      }

-      console.log('[DEBUG] Admin verify - Returning isAdmin: false');
-      // User is not an admin
      return reply.code(200).send({
        isAdmin: false,
        adminRecord: null
      });
    } catch (error) {
-      console.log('[DEBUG] Admin verify - Error caught:', error instanceof Error ? error.message : 'Unknown error');
      logger.error('Error verifying admin access', {
        error: error instanceof Error ? error.message : 'Unknown error',
        userId: request.userContext?.userId?.substring(0, 8) + '...'
@@ -139,9 +107,9 @@ export class AdminController {
   */
  async listAdmins(request: FastifyRequest, reply: FastifyReply) {
    try {
-      const actorId = request.userContext?.userId;
+      const actorUserProfileId = request.userContext?.userId;

-      if (!actorId) {
+      if (!actorUserProfileId) {
        return reply.code(401).send({
          error: 'Unauthorized',
          message: 'User context missing'
@@ -150,11 +118,6 @@ export class AdminController {

      const admins = await this.adminService.getAllAdmins();

-      // Log VIEW action
-      await this.adminService.getAdminByAuth0Sub(actorId);
-      // Note: Not logging VIEW as it would create excessive audit entries
-      // VIEW logging can be enabled if needed for compliance
-
      return reply.code(200).send({
        total: admins.length,
        admins
@@ -162,7 +125,7 @@ export class AdminController {
    } catch (error: any) {
      logger.error('Error listing admins', {
        error: error.message,
-        actorId: request.userContext?.userId
+        actorUserProfileId: request.userContext?.userId
      });
      return reply.code(500).send({
        error: 'Internal server error',
@@ -179,15 +142,24 @@ export class AdminController {
    reply: FastifyReply
  ) {
    try {
-      const actorId = request.userContext?.userId;
+      const actorUserProfileId = request.userContext?.userId;

-      if (!actorId) {
+      if (!actorUserProfileId) {
        return reply.code(401).send({
          error: 'Unauthorized',
          message: 'User context missing'
        });
      }

+      // Get actor's admin record to get admin ID
+      const actorAdmin = await this.adminService.getAdminByUserProfileId(actorUserProfileId);
+      if (!actorAdmin) {
+        return reply.code(403).send({
+          error: 'Forbidden',
+          message: 'Actor is not an admin'
+        });
+      }
+
      // Validate request body
      const validation = createAdminSchema.safeParse(request.body);
      if (!validation.success) {
@@ -200,23 +172,27 @@ export class AdminController {

      const { email, role } = validation.data;

-      // Generate auth0Sub for the new admin
-      // In production, this should be the actual Auth0 user ID
-      // For now, we'll use email-based identifier
-      const auth0Sub = `auth0|${email.replace('@', '_at_')}`;
+      // Look up user profile by email to get UUID
+      const userProfile = await this.userProfileRepository.getByEmail(email);
+      if (!userProfile) {
+        return reply.code(404).send({
+          error: 'Not Found',
+          message: `No user profile found with email ${email}. User must sign up first.`
+        });
+      }

      const admin = await this.adminService.createAdmin(
        email,
        role,
-        auth0Sub,
-        actorId
+        userProfile.id,
+        actorAdmin.id
      );

      return reply.code(201).send(admin);
    } catch (error: any) {
      logger.error('Error creating admin', {
        error: error.message,
-        actorId: request.userContext?.userId
+        actorUserProfileId: request.userContext?.userId
      });

      if (error.message.includes('already exists')) {
@@ -234,36 +210,45 @@ export class AdminController {
  }

  /**
-   * PATCH /api/admin/admins/:auth0Sub/revoke - Revoke admin access
+   * PATCH /api/admin/admins/:id/revoke - Revoke admin access
   */
  async revokeAdmin(
-    request: FastifyRequest<{ Params: AdminAuth0SubInput }>,
+    request: FastifyRequest<{ Params: AdminIdInput }>,
    reply: FastifyReply
  ) {
    try {
-      const actorId = request.userContext?.userId;
+      const actorUserProfileId = request.userContext?.userId;

-      if (!actorId) {
+      if (!actorUserProfileId) {
        return reply.code(401).send({
          error: 'Unauthorized',
          message: 'User context missing'
        });
      }

+      // Get actor's admin record
+      const actorAdmin = await this.adminService.getAdminByUserProfileId(actorUserProfileId);
+      if (!actorAdmin) {
+        return reply.code(403).send({
+          error: 'Forbidden',
+          message: 'Actor is not an admin'
+        });
+      }
+
      // Validate params
-      const validation = adminAuth0SubSchema.safeParse(request.params);
+      const validation = adminIdSchema.safeParse(request.params);
      if (!validation.success) {
        return reply.code(400).send({
          error: 'Bad Request',
-          message: 'Invalid auth0Sub parameter',
+          message: 'Invalid admin ID parameter',
          details: validation.error.errors
        });
      }

-      const { auth0Sub } = validation.data;
+      const { id } = validation.data;

      // Check if admin exists
-      const targetAdmin = await this.adminService.getAdminByAuth0Sub(auth0Sub);
+      const targetAdmin = await this.adminService.getAdminById(id);
      if (!targetAdmin) {
        return reply.code(404).send({
          error: 'Not Found',
@@ -272,14 +257,14 @@ export class AdminController {
      }

      // Revoke the admin (service handles last admin check)
-      const admin = await this.adminService.revokeAdmin(auth0Sub, actorId);
+      const admin = await this.adminService.revokeAdmin(id, actorAdmin.id);

      return reply.code(200).send(admin);
    } catch (error: any) {
      logger.error('Error revoking admin', {
        error: error.message,
-        actorId: request.userContext?.userId,
-        targetAuth0Sub: request.params.auth0Sub
+        actorUserProfileId: request.userContext?.userId,
+        targetAdminId: (request.params as any).id
      });

      if (error.message.includes('Cannot revoke the last active admin')) {
@@ -304,36 +289,45 @@ export class AdminController {
  }

  /**
-   * PATCH /api/admin/admins/:auth0Sub/reinstate - Restore revoked admin
+   * PATCH /api/admin/admins/:id/reinstate - Restore revoked admin
   */
  async reinstateAdmin(
-    request: FastifyRequest<{ Params: AdminAuth0SubInput }>,
+    request: FastifyRequest<{ Params: AdminIdInput }>,
    reply: FastifyReply
  ) {
    try {
-      const actorId = request.userContext?.userId;
+      const actorUserProfileId = request.userContext?.userId;

-      if (!actorId) {
+      if (!actorUserProfileId) {
        return reply.code(401).send({
          error: 'Unauthorized',
          message: 'User context missing'
        });
      }

+      // Get actor's admin record
+      const actorAdmin = await this.adminService.getAdminByUserProfileId(actorUserProfileId);
+      if (!actorAdmin) {
+        return reply.code(403).send({
+          error: 'Forbidden',
+          message: 'Actor is not an admin'
+        });
+      }
+
      // Validate params
-      const validation = adminAuth0SubSchema.safeParse(request.params);
+      const validation = adminIdSchema.safeParse(request.params);
      if (!validation.success) {
        return reply.code(400).send({
          error: 'Bad Request',
-          message: 'Invalid auth0Sub parameter',
+          message: 'Invalid admin ID parameter',
          details: validation.error.errors
        });
      }

-      const { auth0Sub } = validation.data;
+      const { id } = validation.data;

      // Check if admin exists
-      const targetAdmin = await this.adminService.getAdminByAuth0Sub(auth0Sub);
+      const targetAdmin = await this.adminService.getAdminById(id);
      if (!targetAdmin) {
        return reply.code(404).send({
          error: 'Not Found',
@@ -342,14 +336,14 @@ export class AdminController {
      }

      // Reinstate the admin
-      const admin = await this.adminService.reinstateAdmin(auth0Sub, actorId);
+      const admin = await this.adminService.reinstateAdmin(id, actorAdmin.id);

      return reply.code(200).send(admin);
    } catch (error: any) {
      logger.error('Error reinstating admin', {
        error: error.message,
-        actorId: request.userContext?.userId,
-        targetAuth0Sub: request.params.auth0Sub
+        actorUserProfileId: request.userContext?.userId,
+        targetAdminId: (request.params as any).id
      });

      if (error.message.includes('not found')) {
@@ -418,15 +412,24 @@ export class AdminController {
    reply: FastifyReply
  ) {
    try {
-      const actorId = request.userContext?.userId;
+      const actorUserProfileId = request.userContext?.userId;

-      if (!actorId) {
+      if (!actorUserProfileId) {
        return reply.code(401).send({
          error: 'Unauthorized',
          message: 'User context missing'
        });
      }

+      // Get actor's admin record
+      const actorAdmin = await this.adminService.getAdminByUserProfileId(actorUserProfileId);
+      if (!actorAdmin) {
+        return reply.code(403).send({
+          error: 'Forbidden',
+          message: 'Actor is not an admin'
+        });
+      }
+
      // Validate request body
      const validation = bulkCreateAdminSchema.safeParse(request.body);
      if (!validation.success) {
@@ -447,15 +450,21 @@ export class AdminController {
        try {
          const { email, role = 'admin' } = adminInput;

-          // Generate auth0Sub for the new admin
-          // In production, this should be the actual Auth0 user ID
-          const auth0Sub = `auth0|${email.replace('@', '_at_')}`;
+          // Look up user profile by email to get UUID
+          const userProfile = await this.userProfileRepository.getByEmail(email);
+          if (!userProfile) {
+            failed.push({
+              email,
+              error: `No user profile found with email ${email}. User must sign up first.`
+            });
+            continue;
+          }

          const admin = await this.adminService.createAdmin(
            email,
            role,
-            auth0Sub,
-            actorId
+            userProfile.id,
+            actorAdmin.id
          );

          created.push(admin);
@@ -463,7 +472,7 @@ export class AdminController {
          logger.error('Error creating admin in bulk operation', {
            error: error.message,
            email: adminInput.email,
-            actorId
+            actorAdminId: actorAdmin.id
          });

          failed.push({
@@ -485,7 +494,7 @@ export class AdminController {
    } catch (error: any) {
      logger.error('Error in bulk create admins', {
        error: error.message,
-        actorId: request.userContext?.userId
+        actorUserProfileId: request.userContext?.userId
      });

      return reply.code(500).send({
@@ -503,15 +512,24 @@ export class AdminController {
    reply: FastifyReply
  ) {
    try {
-      const actorId = request.userContext?.userId;
+      const actorUserProfileId = request.userContext?.userId;

-      if (!actorId) {
+      if (!actorUserProfileId) {
        return reply.code(401).send({
          error: 'Unauthorized',
          message: 'User context missing'
        });
      }

+      // Get actor's admin record
+      const actorAdmin = await this.adminService.getAdminByUserProfileId(actorUserProfileId);
+      if (!actorAdmin) {
+        return reply.code(403).send({
+          error: 'Forbidden',
+          message: 'Actor is not an admin'
+        });
+      }
+
      // Validate request body
      const validation = bulkRevokeAdminSchema.safeParse(request.body);
      if (!validation.success) {
@@ -522,37 +540,36 @@ export class AdminController {
        });
      }

-      const { auth0Subs } = validation.data;
+      const { ids } = validation.data;

      const revoked: AdminUser[] = [];
-      const failed: Array<{ auth0Sub: string; error: string }> = [];
+      const failed: Array<{ id: string; error: string }> = [];

      // Process each revocation sequentially to maintain data consistency
-      for (const auth0Sub of auth0Subs) {
+      for (const id of ids) {
        try {
          // Check if admin exists
-          const targetAdmin = await this.adminService.getAdminByAuth0Sub(auth0Sub);
+          const targetAdmin = await this.adminService.getAdminById(id);
          if (!targetAdmin) {
            failed.push({
-              auth0Sub,
+              id,
              error: 'Admin user not found'
            });
            continue;
          }

          // Attempt to revoke the admin
-          const admin = await this.adminService.revokeAdmin(auth0Sub, actorId);
+          const admin = await this.adminService.revokeAdmin(id, actorAdmin.id);
          revoked.push(admin);
        } catch (error: any) {
          logger.error('Error revoking admin in bulk operation', {
            error: error.message,
-            auth0Sub,
-            actorId
+            adminId: id,
+            actorAdminId: actorAdmin.id
          });

-          // Special handling for "last admin" constraint
          failed.push({
-            auth0Sub,
+            id,
            error: error.message || 'Failed to revoke admin'
          });
        }
@@ -570,7 +587,7 @@ export class AdminController {
    } catch (error: any) {
      logger.error('Error in bulk revoke admins', {
        error: error.message,
-        actorId: request.userContext?.userId
+        actorUserProfileId: request.userContext?.userId
      });

      return reply.code(500).send({
@@ -588,15 +605,24 @@ export class AdminController {
    reply: FastifyReply
  ) {
    try {
-      const actorId = request.userContext?.userId;
+      const actorUserProfileId = request.userContext?.userId;

-      if (!actorId) {
+      if (!actorUserProfileId) {
        return reply.code(401).send({
          error: 'Unauthorized',
          message: 'User context missing'
        });
      }

+      // Get actor's admin record
+      const actorAdmin = await this.adminService.getAdminByUserProfileId(actorUserProfileId);
+      if (!actorAdmin) {
+        return reply.code(403).send({
+          error: 'Forbidden',
+          message: 'Actor is not an admin'
+        });
+      }
+
      // Validate request body
      const validation = bulkReinstateAdminSchema.safeParse(request.body);
      if (!validation.success) {
@@ -607,36 +633,36 @@ export class AdminController {
        });
      }

-      const { auth0Subs } = validation.data;
+      const { ids } = validation.data;

      const reinstated: AdminUser[] = [];
-      const failed: Array<{ auth0Sub: string; error: string }> = [];
+      const failed: Array<{ id: string; error: string }> = [];

      // Process each reinstatement sequentially to maintain data consistency
-      for (const auth0Sub of auth0Subs) {
+      for (const id of ids) {
        try {
          // Check if admin exists
-          const targetAdmin = await this.adminService.getAdminByAuth0Sub(auth0Sub);
+          const targetAdmin = await this.adminService.getAdminById(id);
          if (!targetAdmin) {
            failed.push({
-              auth0Sub,
+              id,
              error: 'Admin user not found'
            });
            continue;
          }

          // Attempt to reinstate the admin
-          const admin = await this.adminService.reinstateAdmin(auth0Sub, actorId);
+          const admin = await this.adminService.reinstateAdmin(id, actorAdmin.id);
          reinstated.push(admin);
        } catch (error: any) {
          logger.error('Error reinstating admin in bulk operation', {
            error: error.message,
-            auth0Sub,
-            actorId
+            adminId: id,
+            actorAdminId: actorAdmin.id
          });

          failed.push({
-            auth0Sub,
+            id,
            error: error.message || 'Failed to reinstate admin'
          });
        }
@@ -654,7 +680,7 @@ export class AdminController {
    } catch (error: any) {
      logger.error('Error in bulk reinstate admins', {
        error: error.message,
-        actorId: request.userContext?.userId
+        actorUserProfileId: request.userContext?.userId
      });

      return reply.code(500).send({
@@ -665,9 +691,6 @@ export class AdminController {
  }

  private resolveUserEmail(request: FastifyRequest): string | undefined {
-    console.log('[DEBUG] resolveUserEmail - request.userContext:', JSON.stringify(request.userContext, null, 2));
-    console.log('[DEBUG] resolveUserEmail - request.user:', JSON.stringify((request as any).user, null, 2));
-
    const candidates: Array<string | undefined> = [
      request.userContext?.email,
      (request as any).user?.email,
@@ -676,15 +699,11 @@ export class AdminController {
      (request as any).user?.preferred_username,
    ];

-    console.log('[DEBUG] resolveUserEmail - candidates:', candidates);
-
    for (const value of candidates) {
      if (typeof value === 'string' && value.includes('@')) {
-        console.log('[DEBUG] resolveUserEmail - found email:', value);
        return value.trim();
      }
    }
-    console.log('[DEBUG] resolveUserEmail - no email found');
    return undefined;
  }
 }
--- a/backend/src/features/admin/api/admin.routes.ts
+++ b/backend/src/features/admin/api/admin.routes.ts
@@ -8,8 +8,7 @@ import { AdminController } from './admin.controller';
 import { UsersController } from './users.controller';
 import {
  CreateAdminInput,
-  AdminAuth0SubInput,
-  AuditLogsQueryInput,
+  AdminIdInput,
  BulkCreateAdminInput,
  BulkRevokeAdminInput,
  BulkReinstateAdminInput,
@@ -18,7 +17,7 @@ import {
 } from './admin.validation';
 import {
  ListUsersQueryInput,
-  UserAuth0SubInput,
+  UserIdInput,
  UpdateTierInput,
  DeactivateUserInput,
  UpdateProfileInput,
@@ -66,23 +65,19 @@ export const adminRoutes: FastifyPluginAsync = async (fastify) => {
    handler: adminController.createAdmin.bind(adminController)
  });

-  // PATCH /api/admin/admins/:auth0Sub/revoke - Revoke admin access
-  fastify.patch<{ Params: AdminAuth0SubInput }>('/admin/admins/:auth0Sub/revoke', {
+  // PATCH /api/admin/admins/:id/revoke - Revoke admin access
+  fastify.patch<{ Params: AdminIdInput }>('/admin/admins/:id/revoke', {
    preHandler: [fastify.requireAdmin],
    handler: adminController.revokeAdmin.bind(adminController)
  });

-  // PATCH /api/admin/admins/:auth0Sub/reinstate - Restore revoked admin
-  fastify.patch<{ Params: AdminAuth0SubInput }>('/admin/admins/:auth0Sub/reinstate', {
+  // PATCH /api/admin/admins/:id/reinstate - Restore revoked admin
+  fastify.patch<{ Params: AdminIdInput }>('/admin/admins/:id/reinstate', {
    preHandler: [fastify.requireAdmin],
    handler: adminController.reinstateAdmin.bind(adminController)
  });

-  // GET /api/admin/audit-logs - Fetch audit trail
-  fastify.get<{ Querystring: AuditLogsQueryInput }>('/admin/audit-logs', {
-    preHandler: [fastify.requireAdmin],
-    handler: adminController.getAuditLogs.bind(adminController)
-  });
+  // NOTE: GET /api/admin/audit-logs moved to audit-log feature (centralized audit logging)

  // POST /api/admin/admins/bulk - Create multiple admins
  fastify.post<{ Body: BulkCreateAdminInput }>('/admin/admins/bulk', {
@@ -102,6 +97,16 @@ export const adminRoutes: FastifyPluginAsync = async (fastify) => {
    handler: adminController.bulkReinstateAdmins.bind(adminController)
  });

+  // ============================================
+  // Admin Stats endpoint (dashboard widgets)
+  // ============================================
+
+  // GET /api/admin/stats - Get admin dashboard stats (total users, total vehicles)
+  fastify.get('/admin/stats', {
+    preHandler: [fastify.requireAdmin],
+    handler: usersController.getAdminStats.bind(usersController)
+  });
+
  // ============================================
  // User Management endpoints (subscription tiers, deactivation)
  // ============================================
@@ -112,44 +117,50 @@ export const adminRoutes: FastifyPluginAsync = async (fastify) => {
    handler: usersController.listUsers.bind(usersController)
  });

-  // GET /api/admin/users/:auth0Sub - Get single user details
-  fastify.get<{ Params: UserAuth0SubInput }>('/admin/users/:auth0Sub', {
+  // GET /api/admin/users/:userId - Get single user details
+  fastify.get<{ Params: UserIdInput }>('/admin/users/:userId', {
    preHandler: [fastify.requireAdmin],
    handler: usersController.getUser.bind(usersController)
  });

-  // PATCH /api/admin/users/:auth0Sub/tier - Update subscription tier
-  fastify.patch<{ Params: UserAuth0SubInput; Body: UpdateTierInput }>('/admin/users/:auth0Sub/tier', {
+  // GET /api/admin/users/:userId/vehicles - Get user's vehicles (admin view)
+  fastify.get<{ Params: UserIdInput }>('/admin/users/:userId/vehicles', {
+    preHandler: [fastify.requireAdmin],
+    handler: usersController.getUserVehicles.bind(usersController)
+  });
+
+  // PATCH /api/admin/users/:userId/tier - Update subscription tier
+  fastify.patch<{ Params: UserIdInput; Body: UpdateTierInput }>('/admin/users/:userId/tier', {
    preHandler: [fastify.requireAdmin],
    handler: usersController.updateTier.bind(usersController)
  });

-  // PATCH /api/admin/users/:auth0Sub/deactivate - Soft delete user
-  fastify.patch<{ Params: UserAuth0SubInput; Body: DeactivateUserInput }>('/admin/users/:auth0Sub/deactivate', {
+  // PATCH /api/admin/users/:userId/deactivate - Soft delete user
+  fastify.patch<{ Params: UserIdInput; Body: DeactivateUserInput }>('/admin/users/:userId/deactivate', {
    preHandler: [fastify.requireAdmin],
    handler: usersController.deactivateUser.bind(usersController)
  });

-  // PATCH /api/admin/users/:auth0Sub/reactivate - Restore deactivated user
-  fastify.patch<{ Params: UserAuth0SubInput }>('/admin/users/:auth0Sub/reactivate', {
+  // PATCH /api/admin/users/:userId/reactivate - Restore deactivated user
+  fastify.patch<{ Params: UserIdInput }>('/admin/users/:userId/reactivate', {
    preHandler: [fastify.requireAdmin],
    handler: usersController.reactivateUser.bind(usersController)
  });

-  // PATCH /api/admin/users/:auth0Sub/profile - Update user email/displayName
-  fastify.patch<{ Params: UserAuth0SubInput; Body: UpdateProfileInput }>('/admin/users/:auth0Sub/profile', {
+  // PATCH /api/admin/users/:userId/profile - Update user email/displayName
+  fastify.patch<{ Params: UserIdInput; Body: UpdateProfileInput }>('/admin/users/:userId/profile', {
    preHandler: [fastify.requireAdmin],
    handler: usersController.updateProfile.bind(usersController)
  });

-  // PATCH /api/admin/users/:auth0Sub/promote - Promote user to admin
-  fastify.patch<{ Params: UserAuth0SubInput; Body: PromoteToAdminInput }>('/admin/users/:auth0Sub/promote', {
+  // PATCH /api/admin/users/:userId/promote - Promote user to admin
+  fastify.patch<{ Params: UserIdInput; Body: PromoteToAdminInput }>('/admin/users/:userId/promote', {
    preHandler: [fastify.requireAdmin],
    handler: usersController.promoteToAdmin.bind(usersController)
  });

-  // DELETE /api/admin/users/:auth0Sub - Hard delete user (permanent)
-  fastify.delete<{ Params: UserAuth0SubInput }>('/admin/users/:auth0Sub', {
+  // DELETE /api/admin/users/:userId - Hard delete user (permanent)
+  fastify.delete<{ Params: UserIdInput }>('/admin/users/:userId', {
    preHandler: [fastify.requireAdmin],
    handler: usersController.hardDeleteUser.bind(usersController)
  });
--- a/backend/src/features/admin/api/admin.validation.ts
+++ b/backend/src/features/admin/api/admin.validation.ts
@@ -10,8 +10,8 @@ export const createAdminSchema = z.object({
  role: z.enum(['admin', 'super_admin']).default('admin'),
 });

-export const adminAuth0SubSchema = z.object({
-  auth0Sub: z.string().min(1, 'auth0Sub is required'),
+export const adminIdSchema = z.object({
+  id: z.string().uuid('Invalid admin ID format'),
 });

 export const auditLogsQuerySchema = z.object({
@@ -29,14 +29,14 @@ export const bulkCreateAdminSchema = z.object({
 });

 export const bulkRevokeAdminSchema = z.object({
-  auth0Subs: z.array(z.string().min(1, 'auth0Sub cannot be empty'))
-    .min(1, 'At least one auth0Sub must be provided')
+  ids: z.array(z.string().uuid('Invalid admin ID format'))
+    .min(1, 'At least one admin ID must be provided')
    .max(100, 'Maximum 100 admins per batch'),
 });

 export const bulkReinstateAdminSchema = z.object({
-  auth0Subs: z.array(z.string().min(1, 'auth0Sub cannot be empty'))
-    .min(1, 'At least one auth0Sub must be provided')
+  ids: z.array(z.string().uuid('Invalid admin ID format'))
+    .min(1, 'At least one admin ID must be provided')
    .max(100, 'Maximum 100 admins per batch'),
 });

@@ -49,7 +49,7 @@ export const bulkDeleteCatalogSchema = z.object({
 });

 export type CreateAdminInput = z.infer<typeof createAdminSchema>;
-export type AdminAuth0SubInput = z.infer<typeof adminAuth0SubSchema>;
+export type AdminIdInput = z.infer<typeof adminIdSchema>;
 export type AuditLogsQueryInput = z.infer<typeof auditLogsQuerySchema>;
 export type BulkCreateAdminInput = z.infer<typeof bulkCreateAdminSchema>;
 export type BulkRevokeAdminInput = z.infer<typeof bulkRevokeAdminSchema>;
--- a/backend/src/features/admin/api/users.controller.ts
+++ b/backend/src/features/admin/api/users.controller.ts
@@ -7,17 +7,20 @@ import { FastifyRequest, FastifyReply } from 'fastify';
 import { UserProfileService } from '../../user-profile/domain/user-profile.service';
 import { UserProfileRepository } from '../../user-profile/data/user-profile.repository';
 import { AdminRepository } from '../data/admin.repository';
+import { SubscriptionsService } from '../../subscriptions/domain/subscriptions.service';
+import { SubscriptionsRepository } from '../../subscriptions/data/subscriptions.repository';
+import { StripeClient } from '../../subscriptions/external/stripe/stripe.client';
 import { pool } from '../../../core/config/database';
 import { logger } from '../../../core/logging/logger';
 import {
  listUsersQuerySchema,
-  userAuth0SubSchema,
+  userIdSchema,
  updateTierSchema,
  deactivateUserSchema,
  updateProfileSchema,
  promoteToAdminSchema,
  ListUsersQueryInput,
-  UserAuth0SubInput,
+  UserIdInput,
  UpdateTierInput,
  DeactivateUserInput,
  UpdateProfileInput,
@@ -28,14 +31,117 @@ import { AdminService } from '../domain/admin.service';
 export class UsersController {
  private userProfileService: UserProfileService;
  private adminService: AdminService;
+  private subscriptionsService: SubscriptionsService;
+  private userProfileRepository: UserProfileRepository;
+  private adminRepository: AdminRepository;

  constructor() {
-    const userProfileRepository = new UserProfileRepository(pool);
-    const adminRepository = new AdminRepository(pool);
+    this.userProfileRepository = new UserProfileRepository(pool);
+    this.adminRepository = new AdminRepository(pool);
+    const subscriptionsRepository = new SubscriptionsRepository(pool);
+    const stripeClient = new StripeClient();

-    this.userProfileService = new UserProfileService(userProfileRepository);
-    this.userProfileService.setAdminRepository(adminRepository);
-    this.adminService = new AdminService(adminRepository);
+    this.userProfileService = new UserProfileService(this.userProfileRepository);
+    this.userProfileService.setAdminRepository(this.adminRepository);
+    this.adminService = new AdminService(this.adminRepository);
+    // Admin feature depends on Subscriptions for tier management
+    // This is intentional - admin has oversight capabilities
+    this.subscriptionsService = new SubscriptionsService(subscriptionsRepository, stripeClient, pool);
+  }
+
+  /**
+   * GET /api/admin/stats - Get admin dashboard stats
+   */
+  async getAdminStats(
+    request: FastifyRequest,
+    reply: FastifyReply
+  ) {
+    try {
+      const actorId = request.userContext?.userId;
+      if (!actorId) {
+        return reply.code(401).send({
+          error: 'Unauthorized',
+          message: 'User context missing',
+        });
+      }
+
+      // Defense-in-depth: verify admin status even with requireAdmin guard
+      if (!request.userContext?.isAdmin) {
+        return reply.code(403).send({
+          error: 'Forbidden',
+          message: 'Admin access required',
+        });
+      }
+
+      const [totalVehicles, totalUsers] = await Promise.all([
+        this.userProfileRepository.getTotalVehicleCount(),
+        this.userProfileRepository.getTotalUserCount(),
+      ]);
+
+      return reply.code(200).send({
+        totalVehicles,
+        totalUsers,
+      });
+    } catch (error) {
+      logger.error('Error getting admin stats', {
+        error: error instanceof Error ? error.message : 'Unknown error',
+      });
+
+      return reply.code(500).send({
+        error: 'Internal server error',
+        message: 'Failed to get admin stats',
+      });
+    }
+  }
+
+  /**
+   * GET /api/admin/users/:userId/vehicles - Get user's vehicles (admin view)
+   */
+  async getUserVehicles(
+    request: FastifyRequest<{ Params: UserIdInput }>,
+    reply: FastifyReply
+  ) {
+    try {
+      const actorId = request.userContext?.userId;
+      if (!actorId) {
+        return reply.code(401).send({
+          error: 'Unauthorized',
+          message: 'User context missing',
+        });
+      }
+
+      // Defense-in-depth: verify admin status even with requireAdmin guard
+      if (!request.userContext?.isAdmin) {
+        return reply.code(403).send({
+          error: 'Forbidden',
+          message: 'Admin access required',
+        });
+      }
+
+      // Validate path param
+      const parseResult = userIdSchema.safeParse(request.params);
+      if (!parseResult.success) {
+        return reply.code(400).send({
+          error: 'Validation error',
+          message: parseResult.error.errors.map(e => e.message).join(', '),
+        });
+      }
+
+      const { userId } = parseResult.data;
+      const vehicles = await this.userProfileRepository.getUserVehiclesForAdmin(userId);
+
+      return reply.code(200).send({ vehicles });
+    } catch (error) {
+      logger.error('Error getting user vehicles', {
+        error: error instanceof Error ? error.message : 'Unknown error',
+        userId: (request.params as any)?.userId,
+      });
+
+      return reply.code(500).send({
+        error: 'Internal server error',
+        message: 'Failed to get user vehicles',
+      });
+    }
  }

  /**
@@ -80,10 +186,10 @@ export class UsersController {
  }

  /**
-   * GET /api/admin/users/:auth0Sub - Get single user details
+   * GET /api/admin/users/:userId - Get single user details
   */
  async getUser(
-    request: FastifyRequest<{ Params: UserAuth0SubInput }>,
+    request: FastifyRequest<{ Params: UserIdInput }>,
    reply: FastifyReply
  ) {
    try {
@@ -96,7 +202,7 @@ export class UsersController {
      }

      // Validate path param
-      const parseResult = userAuth0SubSchema.safeParse(request.params);
+      const parseResult = userIdSchema.safeParse(request.params);
      if (!parseResult.success) {
        return reply.code(400).send({
          error: 'Validation error',
@@ -104,8 +210,8 @@ export class UsersController {
        });
      }

-      const { auth0Sub } = parseResult.data;
-      const user = await this.userProfileService.getUserDetails(auth0Sub);
+      const { userId } = parseResult.data;
+      const user = await this.userProfileService.getUserDetails(userId);

      if (!user) {
        return reply.code(404).send({
@@ -118,7 +224,7 @@ export class UsersController {
    } catch (error) {
      logger.error('Error getting user details', {
        error: error instanceof Error ? error.message : 'Unknown error',
-        auth0Sub: request.params?.auth0Sub,
+        userId: (request.params as any)?.userId,
      });

      return reply.code(500).send({
@@ -129,10 +235,12 @@ export class UsersController {
  }

  /**
-   * PATCH /api/admin/users/:auth0Sub/tier - Update subscription tier
+   * PATCH /api/admin/users/:userId/tier - Update subscription tier
+   * Uses subscriptionsService.adminOverrideTier() to sync both subscriptions.tier
+   * and user_profiles.subscription_tier atomically
   */
  async updateTier(
-    request: FastifyRequest<{ Params: UserAuth0SubInput; Body: UpdateTierInput }>,
+    request: FastifyRequest<{ Params: UserIdInput; Body: UpdateTierInput }>,
    reply: FastifyReply
  ) {
    try {
@@ -145,7 +253,7 @@ export class UsersController {
      }

      // Validate path param
-      const paramsResult = userAuth0SubSchema.safeParse(request.params);
+      const paramsResult = userIdSchema.safeParse(request.params);
      if (!paramsResult.success) {
        return reply.code(400).send({
          error: 'Validation error',
@@ -162,22 +270,49 @@ export class UsersController {
        });
      }

-      const { auth0Sub } = paramsResult.data;
+      const { userId } = paramsResult.data;
      const { subscriptionTier } = bodyResult.data;

-      const updatedUser = await this.userProfileService.updateSubscriptionTier(
-        auth0Sub,
-        subscriptionTier,
-        actorId
+      // Verify user exists before attempting tier change
+      const currentUser = await this.userProfileService.getUserDetails(userId);
+      if (!currentUser) {
+        return reply.code(404).send({
+          error: 'Not found',
+          message: 'User not found',
+        });
+      }
+
+      const previousTier = currentUser.subscriptionTier;
+
+      // Use subscriptionsService to update both tables atomically
+      await this.subscriptionsService.adminOverrideTier(userId, subscriptionTier);
+
+      // Log audit action
+      await this.adminRepository.logAuditAction(
+        actorId,
+        'UPDATE_TIER',
+        userId,
+        'user_profile',
+        currentUser.id,
+        { previousTier, newTier: subscriptionTier }
      );

+      logger.info('User subscription tier updated via admin', {
+        userId,
+        previousTier,
+        newTier: subscriptionTier,
+        actorId,
+      });
+
+      // Return updated user profile
+      const updatedUser = await this.userProfileService.getUserDetails(userId);
      return reply.code(200).send(updatedUser);
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error';

      logger.error('Error updating user tier', {
        error: errorMessage,
-        auth0Sub: request.params?.auth0Sub,
+        userId: (request.params as any)?.userId,
      });

      if (errorMessage === 'User not found') {
@@ -195,10 +330,10 @@ export class UsersController {
  }

  /**
-   * PATCH /api/admin/users/:auth0Sub/deactivate - Soft delete user
+   * PATCH /api/admin/users/:userId/deactivate - Soft delete user
   */
  async deactivateUser(
-    request: FastifyRequest<{ Params: UserAuth0SubInput; Body: DeactivateUserInput }>,
+    request: FastifyRequest<{ Params: UserIdInput; Body: DeactivateUserInput }>,
    reply: FastifyReply
  ) {
    try {
@@ -211,7 +346,7 @@ export class UsersController {
      }

      // Validate path param
-      const paramsResult = userAuth0SubSchema.safeParse(request.params);
+      const paramsResult = userIdSchema.safeParse(request.params);
      if (!paramsResult.success) {
        return reply.code(400).send({
          error: 'Validation error',
@@ -228,11 +363,11 @@ export class UsersController {
        });
      }

-      const { auth0Sub } = paramsResult.data;
+      const { userId } = paramsResult.data;
      const { reason } = bodyResult.data;

      const deactivatedUser = await this.userProfileService.deactivateUser(
-        auth0Sub,
+        userId,
        actorId,
        reason
      );
@@ -243,7 +378,7 @@ export class UsersController {

      logger.error('Error deactivating user', {
        error: errorMessage,
-        auth0Sub: request.params?.auth0Sub,
+        userId: (request.params as any)?.userId,
      });

      if (errorMessage === 'User not found') {
@@ -275,10 +410,10 @@ export class UsersController {
  }

  /**
-   * PATCH /api/admin/users/:auth0Sub/reactivate - Restore deactivated user
+   * PATCH /api/admin/users/:userId/reactivate - Restore deactivated user
   */
  async reactivateUser(
-    request: FastifyRequest<{ Params: UserAuth0SubInput }>,
+    request: FastifyRequest<{ Params: UserIdInput }>,
    reply: FastifyReply
  ) {
    try {
@@ -291,7 +426,7 @@ export class UsersController {
      }

      // Validate path param
-      const paramsResult = userAuth0SubSchema.safeParse(request.params);
+      const paramsResult = userIdSchema.safeParse(request.params);
      if (!paramsResult.success) {
        return reply.code(400).send({
          error: 'Validation error',
@@ -299,10 +434,10 @@ export class UsersController {
        });
      }

-      const { auth0Sub } = paramsResult.data;
+      const { userId } = paramsResult.data;

      const reactivatedUser = await this.userProfileService.reactivateUser(
-        auth0Sub,
+        userId,
        actorId
      );

@@ -312,7 +447,7 @@ export class UsersController {

      logger.error('Error reactivating user', {
        error: errorMessage,
-        auth0Sub: request.params?.auth0Sub,
+        userId: (request.params as any)?.userId,
      });

      if (errorMessage === 'User not found') {
@@ -337,10 +472,10 @@ export class UsersController {
  }

  /**
-   * PATCH /api/admin/users/:auth0Sub/profile - Update user email/displayName
+   * PATCH /api/admin/users/:userId/profile - Update user email/displayName
   */
  async updateProfile(
-    request: FastifyRequest<{ Params: UserAuth0SubInput; Body: UpdateProfileInput }>,
+    request: FastifyRequest<{ Params: UserIdInput; Body: UpdateProfileInput }>,
    reply: FastifyReply
  ) {
    try {
@@ -353,7 +488,7 @@ export class UsersController {
      }

      // Validate path param
-      const paramsResult = userAuth0SubSchema.safeParse(request.params);
+      const paramsResult = userIdSchema.safeParse(request.params);
      if (!paramsResult.success) {
        return reply.code(400).send({
          error: 'Validation error',
@@ -370,11 +505,11 @@ export class UsersController {
        });
      }

-      const { auth0Sub } = paramsResult.data;
+      const { userId } = paramsResult.data;
      const updates = bodyResult.data;

      const updatedUser = await this.userProfileService.adminUpdateProfile(
-        auth0Sub,
+        userId,
        updates,
        actorId
      );
@@ -385,7 +520,7 @@ export class UsersController {

      logger.error('Error updating user profile', {
        error: errorMessage,
-        auth0Sub: request.params?.auth0Sub,
+        userId: (request.params as any)?.userId,
      });

      if (errorMessage === 'User not found') {
@@ -403,10 +538,10 @@ export class UsersController {
  }

  /**
-   * PATCH /api/admin/users/:auth0Sub/promote - Promote user to admin
+   * PATCH /api/admin/users/:userId/promote - Promote user to admin
   */
  async promoteToAdmin(
-    request: FastifyRequest<{ Params: UserAuth0SubInput; Body: PromoteToAdminInput }>,
+    request: FastifyRequest<{ Params: UserIdInput; Body: PromoteToAdminInput }>,
    reply: FastifyReply
  ) {
    try {
@@ -419,7 +554,7 @@ export class UsersController {
      }

      // Validate path param
-      const paramsResult = userAuth0SubSchema.safeParse(request.params);
+      const paramsResult = userIdSchema.safeParse(request.params);
      if (!paramsResult.success) {
        return reply.code(400).send({
          error: 'Validation error',
@@ -436,11 +571,11 @@ export class UsersController {
        });
      }

-      const { auth0Sub } = paramsResult.data;
+      const { userId } = paramsResult.data;
      const { role } = bodyResult.data;

-      // Get the user profile first to verify they exist and get their email
-      const user = await this.userProfileService.getUserDetails(auth0Sub);
+      // Get the user profile to verify they exist and get their email
+      const user = await this.userProfileService.getUserDetails(userId);
      if (!user) {
        return reply.code(404).send({
          error: 'Not found',
@@ -456,12 +591,15 @@ export class UsersController {
        });
      }

-      // Create the admin record using the user's real auth0Sub
+      // Get actor's admin record for audit trail
+      const actorAdmin = await this.adminService.getAdminByUserProfileId(actorId);
+
+      // Create the admin record using the user's UUID
      const adminUser = await this.adminService.createAdmin(
        user.email,
        role,
-        auth0Sub, // Use the real auth0Sub from the user profile
-        actorId
+        userId,
+        actorAdmin?.id || actorId
      );

      return reply.code(201).send(adminUser);
@@ -470,7 +608,7 @@ export class UsersController {

      logger.error('Error promoting user to admin', {
        error: errorMessage,
-        auth0Sub: request.params?.auth0Sub,
+        userId: (request.params as any)?.userId,
      });

      if (errorMessage.includes('already exists')) {
@@ -488,10 +626,10 @@ export class UsersController {
  }

  /**
-   * DELETE /api/admin/users/:auth0Sub - Hard delete user (permanent)
+   * DELETE /api/admin/users/:userId - Hard delete user (permanent)
   */
  async hardDeleteUser(
-    request: FastifyRequest<{ Params: UserAuth0SubInput }>,
+    request: FastifyRequest<{ Params: UserIdInput }>,
    reply: FastifyReply
  ) {
    try {
@@ -504,7 +642,7 @@ export class UsersController {
      }

      // Validate path param
-      const paramsResult = userAuth0SubSchema.safeParse(request.params);
+      const paramsResult = userIdSchema.safeParse(request.params);
      if (!paramsResult.success) {
        return reply.code(400).send({
          error: 'Validation error',
@@ -512,14 +650,14 @@ export class UsersController {
        });
      }

-      const { auth0Sub } = paramsResult.data;
+      const { userId } = paramsResult.data;

      // Optional reason from query params
      const reason = (request.query as any)?.reason;

      // Hard delete user
      await this.userProfileService.adminHardDeleteUser(
-        auth0Sub,
+        userId,
        actorId,
        reason
      );
@@ -532,7 +670,7 @@ export class UsersController {

      logger.error('Error hard deleting user', {
        error: errorMessage,
-        auth0Sub: request.params?.auth0Sub,
+        userId: (request.params as any)?.userId,
      });

      if (errorMessage === 'Cannot delete your own account') {
--- a/backend/src/features/admin/api/users.validation.ts
+++ b/backend/src/features/admin/api/users.validation.ts
@@ -19,9 +19,9 @@ export const listUsersQuerySchema = z.object({
  sortOrder: z.enum(['asc', 'desc']).default('desc'),
 });

-// Path param for user auth0Sub
-export const userAuth0SubSchema = z.object({
-  auth0Sub: z.string().min(1, 'auth0Sub is required'),
+// Path param for user UUID
+export const userIdSchema = z.object({
+  userId: z.string().uuid('Invalid user ID format'),
 });

 // Body for updating subscription tier
@@ -50,7 +50,7 @@ export const promoteToAdminSchema = z.object({

 // Type exports
 export type ListUsersQueryInput = z.infer<typeof listUsersQuerySchema>;
-export type UserAuth0SubInput = z.infer<typeof userAuth0SubSchema>;
+export type UserIdInput = z.infer<typeof userIdSchema>;
 export type UpdateTierInput = z.infer<typeof updateTierSchema>;
 export type DeactivateUserInput = z.infer<typeof deactivateUserSchema>;
 export type UpdateProfileInput = z.infer<typeof updateProfileSchema>;
--- a/backend/src/features/admin/data/admin.repository.ts
+++ b/backend/src/features/admin/data/admin.repository.ts
@@ -10,29 +10,49 @@ import { logger } from '../../../core/logging/logger';
 export class AdminRepository {
  constructor(private pool: Pool) {}

-  async getAdminByAuth0Sub(auth0Sub: string): Promise<AdminUser | null> {
+  async getAdminById(id: string): Promise<AdminUser | null> {
    const query = `
-      SELECT auth0_sub, email, role, created_at, created_by, revoked_at, updated_at
+      SELECT id, user_profile_id, email, role, created_at, created_by, revoked_at, updated_at
      FROM admin_users
-      WHERE auth0_sub = $1
+      WHERE id = $1
      LIMIT 1
    `;

    try {
-      const result = await this.pool.query(query, [auth0Sub]);
+      const result = await this.pool.query(query, [id]);
      if (result.rows.length === 0) {
        return null;
      }
      return this.mapRowToAdminUser(result.rows[0]);
    } catch (error) {
-      logger.error('Error fetching admin by auth0_sub', { error, auth0Sub });
+      logger.error('Error fetching admin by id', { error, id });
+      throw error;
+    }
+  }
+
+  async getAdminByUserProfileId(userProfileId: string): Promise<AdminUser | null> {
+    const query = `
+      SELECT id, user_profile_id, email, role, created_at, created_by, revoked_at, updated_at
+      FROM admin_users
+      WHERE user_profile_id = $1
+      LIMIT 1
+    `;
+
+    try {
+      const result = await this.pool.query(query, [userProfileId]);
+      if (result.rows.length === 0) {
+        return null;
+      }
+      return this.mapRowToAdminUser(result.rows[0]);
+    } catch (error) {
+      logger.error('Error fetching admin by user_profile_id', { error, userProfileId });
      throw error;
    }
  }

  async getAdminByEmail(email: string): Promise<AdminUser | null> {
    const query = `
-      SELECT auth0_sub, email, role, created_at, created_by, revoked_at, updated_at
+      SELECT id, user_profile_id, email, role, created_at, created_by, revoked_at, updated_at
      FROM admin_users
      WHERE LOWER(email) = LOWER($1)
      LIMIT 1
@@ -52,7 +72,7 @@ export class AdminRepository {

  async getAllAdmins(): Promise<AdminUser[]> {
    const query = `
-      SELECT auth0_sub, email, role, created_at, created_by, revoked_at, updated_at
+      SELECT id, user_profile_id, email, role, created_at, created_by, revoked_at, updated_at
      FROM admin_users
      ORDER BY created_at DESC
    `;
@@ -68,7 +88,7 @@ export class AdminRepository {

  async getActiveAdmins(): Promise<AdminUser[]> {
    const query = `
-      SELECT auth0_sub, email, role, created_at, created_by, revoked_at, updated_at
+      SELECT id, user_profile_id, email, role, created_at, created_by, revoked_at, updated_at
      FROM admin_users
      WHERE revoked_at IS NULL
      ORDER BY created_at DESC
@@ -83,61 +103,61 @@ export class AdminRepository {
    }
  }

-  async createAdmin(auth0Sub: string, email: string, role: string, createdBy: string): Promise<AdminUser> {
+  async createAdmin(userProfileId: string, email: string, role: string, createdBy: string): Promise<AdminUser> {
    const query = `
-      INSERT INTO admin_users (auth0_sub, email, role, created_by)
+      INSERT INTO admin_users (user_profile_id, email, role, created_by)
      VALUES ($1, $2, $3, $4)
-      RETURNING auth0_sub, email, role, created_at, created_by, revoked_at, updated_at
+      RETURNING id, user_profile_id, email, role, created_at, created_by, revoked_at, updated_at
    `;

    try {
-      const result = await this.pool.query(query, [auth0Sub, email, role, createdBy]);
+      const result = await this.pool.query(query, [userProfileId, email, role, createdBy]);
      if (result.rows.length === 0) {
        throw new Error('Failed to create admin user');
      }
      return this.mapRowToAdminUser(result.rows[0]);
    } catch (error) {
-      logger.error('Error creating admin', { error, auth0Sub, email });
+      logger.error('Error creating admin', { error, userProfileId, email });
      throw error;
    }
  }

-  async revokeAdmin(auth0Sub: string): Promise<AdminUser> {
+  async revokeAdmin(id: string): Promise<AdminUser> {
    const query = `
      UPDATE admin_users
      SET revoked_at = CURRENT_TIMESTAMP
-      WHERE auth0_sub = $1
-      RETURNING auth0_sub, email, role, created_at, created_by, revoked_at, updated_at
+      WHERE id = $1
+      RETURNING id, user_profile_id, email, role, created_at, created_by, revoked_at, updated_at
    `;

    try {
-      const result = await this.pool.query(query, [auth0Sub]);
+      const result = await this.pool.query(query, [id]);
      if (result.rows.length === 0) {
        throw new Error('Admin user not found');
      }
      return this.mapRowToAdminUser(result.rows[0]);
    } catch (error) {
-      logger.error('Error revoking admin', { error, auth0Sub });
+      logger.error('Error revoking admin', { error, id });
      throw error;
    }
  }

-  async reinstateAdmin(auth0Sub: string): Promise<AdminUser> {
+  async reinstateAdmin(id: string): Promise<AdminUser> {
    const query = `
      UPDATE admin_users
      SET revoked_at = NULL
-      WHERE auth0_sub = $1
-      RETURNING auth0_sub, email, role, created_at, created_by, revoked_at, updated_at
+      WHERE id = $1
+      RETURNING id, user_profile_id, email, role, created_at, created_by, revoked_at, updated_at
    `;

    try {
-      const result = await this.pool.query(query, [auth0Sub]);
+      const result = await this.pool.query(query, [id]);
      if (result.rows.length === 0) {
        throw new Error('Admin user not found');
      }
      return this.mapRowToAdminUser(result.rows[0]);
    } catch (error) {
-      logger.error('Error reinstating admin', { error, auth0Sub });
+      logger.error('Error reinstating admin', { error, id });
      throw error;
    }
  }
@@ -202,30 +222,11 @@ export class AdminRepository {
    }
  }

-  async updateAuth0SubByEmail(email: string, auth0Sub: string): Promise<AdminUser> {
-    const query = `
-      UPDATE admin_users
-      SET auth0_sub = $1,
-          updated_at = CURRENT_TIMESTAMP
-      WHERE LOWER(email) = LOWER($2)
-      RETURNING auth0_sub, email, role, created_at, created_by, revoked_at, updated_at
-    `;
-
-    try {
-      const result = await this.pool.query(query, [auth0Sub, email]);
-      if (result.rows.length === 0) {
-        throw new Error(`Admin user with email ${email} not found`);
-      }
-      return this.mapRowToAdminUser(result.rows[0]);
-    } catch (error) {
-      logger.error('Error updating admin auth0_sub by email', { error, email, auth0Sub });
-      throw error;
-    }
-  }

  private mapRowToAdminUser(row: any): AdminUser {
    return {
-      auth0Sub: row.auth0_sub,
+      id: row.id,
+      userProfileId: row.user_profile_id,
      email: row.email,
      role: row.role,
      createdAt: new Date(row.created_at),
--- a/backend/src/features/admin/domain/admin.service.ts
+++ b/backend/src/features/admin/domain/admin.service.ts
@@ -6,15 +6,25 @@
 import { AdminRepository } from '../data/admin.repository';
 import { AdminUser, AdminAuditLog } from './admin.types';
 import { logger } from '../../../core/logging/logger';
+import { auditLogService } from '../../audit-log';

 export class AdminService {
  constructor(private repository: AdminRepository) {}

-  async getAdminByAuth0Sub(auth0Sub: string): Promise<AdminUser | null> {
+  async getAdminById(id: string): Promise<AdminUser | null> {
    try {
-      return await this.repository.getAdminByAuth0Sub(auth0Sub);
+      return await this.repository.getAdminById(id);
    } catch (error) {
-      logger.error('Error getting admin by auth0_sub', { error });
+      logger.error('Error getting admin by id', { error });
+      throw error;
+    }
+  }
+
+  async getAdminByUserProfileId(userProfileId: string): Promise<AdminUser | null> {
+    try {
+      return await this.repository.getAdminByUserProfileId(userProfileId);
+    } catch (error) {
+      logger.error('Error getting admin by user_profile_id', { error });
      throw error;
    }
  }
@@ -46,7 +56,7 @@ export class AdminService {
    }
  }

-  async createAdmin(email: string, role: string, auth0Sub: string, createdBy: string): Promise<AdminUser> {
+  async createAdmin(email: string, role: string, userProfileId: string, createdByAdminId: string): Promise<AdminUser> {
    try {
      // Check if admin already exists
      const normalizedEmail = email.trim().toLowerCase();
@@ -56,14 +66,24 @@ export class AdminService {
      }

      // Create new admin
-      const admin = await this.repository.createAdmin(auth0Sub, normalizedEmail, role, createdBy);
+      const admin = await this.repository.createAdmin(userProfileId, normalizedEmail, role, createdByAdminId);

-      // Log audit action
-      await this.repository.logAuditAction(createdBy, 'CREATE', admin.auth0Sub, 'admin_user', admin.email, {
+      // Log audit action (legacy)
+      await this.repository.logAuditAction(createdByAdminId, 'CREATE', admin.id, 'admin_user', admin.email, {
        email,
        role
      });

+      // Log to unified audit log
+      await auditLogService.info(
+        'admin',
+        userProfileId,
+        `Admin user created: ${admin.email}`,
+        'admin_user',
+        admin.id,
+        { email: admin.email, role }
+      ).catch(err => logger.error('Failed to log admin create audit event', { error: err }));
+
      logger.info('Admin user created', { email, role });
      return admin;
    } catch (error) {
@@ -72,7 +92,7 @@ export class AdminService {
    }
  }

-  async revokeAdmin(auth0Sub: string, revokedBy: string): Promise<AdminUser> {
+  async revokeAdmin(id: string, revokedByAdminId: string): Promise<AdminUser> {
    try {
      // Check that at least one active admin will remain
      const activeAdmins = await this.repository.getActiveAdmins();
@@ -81,31 +101,51 @@ export class AdminService {
      }

      // Revoke the admin
-      const admin = await this.repository.revokeAdmin(auth0Sub);
+      const admin = await this.repository.revokeAdmin(id);

-      // Log audit action
-      await this.repository.logAuditAction(revokedBy, 'REVOKE', auth0Sub, 'admin_user', admin.email);
+      // Log audit action (legacy)
+      await this.repository.logAuditAction(revokedByAdminId, 'REVOKE', id, 'admin_user', admin.email);

-      logger.info('Admin user revoked', { auth0Sub, email: admin.email });
+      // Log to unified audit log
+      await auditLogService.info(
+        'admin',
+        admin.userProfileId,
+        `Admin user revoked: ${admin.email}`,
+        'admin_user',
+        id,
+        { email: admin.email }
+      ).catch(err => logger.error('Failed to log admin revoke audit event', { error: err }));
+
+      logger.info('Admin user revoked', { id, email: admin.email });
      return admin;
    } catch (error) {
-      logger.error('Error revoking admin', { error, auth0Sub });
+      logger.error('Error revoking admin', { error, id });
      throw error;
    }
  }

-  async reinstateAdmin(auth0Sub: string, reinstatedBy: string): Promise<AdminUser> {
+  async reinstateAdmin(id: string, reinstatedByAdminId: string): Promise<AdminUser> {
    try {
      // Reinstate the admin
-      const admin = await this.repository.reinstateAdmin(auth0Sub);
+      const admin = await this.repository.reinstateAdmin(id);

-      // Log audit action
-      await this.repository.logAuditAction(reinstatedBy, 'REINSTATE', auth0Sub, 'admin_user', admin.email);
+      // Log audit action (legacy)
+      await this.repository.logAuditAction(reinstatedByAdminId, 'REINSTATE', id, 'admin_user', admin.email);

-      logger.info('Admin user reinstated', { auth0Sub, email: admin.email });
+      // Log to unified audit log
+      await auditLogService.info(
+        'admin',
+        admin.userProfileId,
+        `Admin user reinstated: ${admin.email}`,
+        'admin_user',
+        id,
+        { email: admin.email }
+      ).catch(err => logger.error('Failed to log admin reinstate audit event', { error: err }));
+
+      logger.info('Admin user reinstated', { id, email: admin.email });
      return admin;
    } catch (error) {
-      logger.error('Error reinstating admin', { error, auth0Sub });
+      logger.error('Error reinstating admin', { error, id });
      throw error;
    }
  }
@@ -119,12 +159,4 @@ export class AdminService {
    }
  }

-  async linkAdminAuth0Sub(email: string, auth0Sub: string): Promise<AdminUser> {
-    try {
-      return await this.repository.updateAuth0SubByEmail(email.trim().toLowerCase(), auth0Sub);
-    } catch (error) {
-      logger.error('Error linking admin auth0_sub to email', { error, email, auth0Sub });
-      throw error;
-    }
-  }
 }
--- a/backend/src/features/admin/domain/admin.types.ts
+++ b/backend/src/features/admin/domain/admin.types.ts
@@ -4,7 +4,8 @@
 */

 export interface AdminUser {
-  auth0Sub: string;
+  id: string;
+  userProfileId: string;
  email: string;
  role: 'admin' | 'super_admin';
  createdAt: Date;
@@ -19,11 +20,11 @@ export interface CreateAdminRequest {
 }

 export interface RevokeAdminRequest {
-  auth0Sub: string;
+  id: string;
 }

 export interface ReinstateAdminRequest {
-  auth0Sub: string;
+  id: string;
 }

 export interface AdminAuditLog {
@@ -71,25 +72,25 @@ export interface BulkCreateAdminResponse {
 }

 export interface BulkRevokeAdminRequest {
-  auth0Subs: string[];
+  ids: string[];
 }

 export interface BulkRevokeAdminResponse {
  revoked: AdminUser[];
  failed: Array<{
-    auth0Sub: string;
+    id: string;
    error: string;
  }>;
 }

 export interface BulkReinstateAdminRequest {
-  auth0Subs: string[];
+  ids: string[];
 }

 export interface BulkReinstateAdminResponse {
  reinstated: AdminUser[];
  failed: Array<{
-    auth0Sub: string;
+    id: string;
    error: string;
  }>;
 }
--- a/backend/src/features/admin/tests/integration/admin.integration.test.ts
+++ b/backend/src/features/admin/tests/integration/admin.integration.test.ts
@@ -4,18 +4,19 @@
 */

 import request from 'supertest';
-import { app } from '../../../../app';
+import { buildApp } from '../../../../app';
 import pool from '../../../../core/config/database';
+import { FastifyInstance } from 'fastify';
 import { readFileSync } from 'fs';
 import { join } from 'path';
 import fastifyPlugin from 'fastify-plugin';
 import { setAdminGuardPool } from '../../../../core/plugins/admin-guard.plugin';

-const DEFAULT_ADMIN_SUB = 'test-admin-123';
+const DEFAULT_ADMIN_ID = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
 const DEFAULT_ADMIN_EMAIL = 'test-admin@motovaultpro.com';

 let currentUser = {
-  sub: DEFAULT_ADMIN_SUB,
+  sub: 'auth0|test-admin-123',
  email: DEFAULT_ADMIN_EMAIL,
 };

@@ -25,11 +26,15 @@ jest.mock('../../../../core/plugins/auth.plugin', () => {
    default: fastifyPlugin(async function(fastify) {
      fastify.decorate('authenticate', async function(request, _reply) {
        // Inject dynamic test user context
+        // JWT sub is still auth0|xxx format
        request.user = { sub: currentUser.sub };
        request.userContext = {
-          userId: currentUser.sub,
+          userId: DEFAULT_ADMIN_ID,
          email: currentUser.email,
+          emailVerified: true,
+          onboardingCompleted: true,
          isAdmin: false, // Will be set by admin guard
+          subscriptionTier: 'free',
        };
      });
    }, { name: 'auth-plugin' })
@@ -37,10 +42,14 @@ jest.mock('../../../../core/plugins/auth.plugin', () => {
 });

 describe('Admin Management Integration Tests', () => {
-  let testAdminAuth0Sub: string;
-  let testNonAdminAuth0Sub: string;
+  let app: FastifyInstance;
+  let testAdminId: string;

  beforeAll(async () => {
+    // Build the app
+    app = await buildApp();
+    await app.ready();
+
    // Run the admin migration directly using the migration file
    const migrationFile = join(__dirname, '../../migrations/001_create_admin_users.sql');
    const migrationSQL = readFileSync(migrationFile, 'utf-8');
@@ -50,33 +59,31 @@ describe('Admin Management Integration Tests', () => {
    setAdminGuardPool(pool);

    // Create test admin user
-    testAdminAuth0Sub = DEFAULT_ADMIN_SUB;
+    testAdminId = DEFAULT_ADMIN_ID;
    await pool.query(`
-      INSERT INTO admin_users (auth0_sub, email, role, created_by)
-      VALUES ($1, $2, $3, $4)
-      ON CONFLICT (auth0_sub) DO NOTHING
-    `, [testAdminAuth0Sub, DEFAULT_ADMIN_EMAIL, 'admin', 'system']);
-
-    // Create test non-admin auth0Sub for permission tests
-    testNonAdminAuth0Sub = 'test-non-admin-456';
+      INSERT INTO admin_users (id, user_profile_id, email, role, created_by)
+      VALUES ($1, $2, $3, $4, $5)
+      ON CONFLICT (user_profile_id) DO NOTHING
+    `, [testAdminId, testAdminId, DEFAULT_ADMIN_EMAIL, 'admin', 'system']);
  });

  afterAll(async () => {
    // Clean up test database
    await pool.query('DROP TABLE IF EXISTS admin_audit_logs CASCADE');
    await pool.query('DROP TABLE IF EXISTS admin_users CASCADE');
+    await app.close();
    await pool.end();
  });

  beforeEach(async () => {
    // Clean up test data before each test (except the test admin)
    await pool.query(
-      'DELETE FROM admin_users WHERE auth0_sub != $1 AND auth0_sub != $2',
-      [testAdminAuth0Sub, 'system|bootstrap']
+      'DELETE FROM admin_users WHERE user_profile_id != $1',
+      [testAdminId]
    );
    await pool.query('DELETE FROM admin_audit_logs');
    currentUser = {
-      sub: DEFAULT_ADMIN_SUB,
+      sub: 'auth0|test-admin-123',
      email: DEFAULT_ADMIN_EMAIL,
    };
  });
@@ -85,11 +92,11 @@ describe('Admin Management Integration Tests', () => {
    it('should reject non-admin user trying to list admins', async () => {
      // Create mock for non-admin user
      currentUser = {
-        sub: testNonAdminAuth0Sub,
+        sub: 'auth0|test-non-admin-456',
        email: 'test-user@example.com',
      };

-      const response = await request(app)
+      const response = await request(app.server)
        .get('/api/admin/admins')
        .expect(403);

@@ -101,51 +108,51 @@ describe('Admin Management Integration Tests', () => {
  describe('GET /api/admin/verify', () => {
    it('should confirm admin access for existing admin', async () => {
      currentUser = {
-        sub: testAdminAuth0Sub,
+        sub: 'auth0|test-admin-123',
        email: DEFAULT_ADMIN_EMAIL,
      };

-      const response = await request(app)
+      const response = await request(app.server)
        .get('/api/admin/verify')
        .expect(200);

      expect(response.body.isAdmin).toBe(true);
      expect(response.body.adminRecord).toMatchObject({
-        auth0Sub: testAdminAuth0Sub,
+        id: testAdminId,
        email: DEFAULT_ADMIN_EMAIL,
      });
    });

-    it('should link admin record by email when auth0_sub differs', async () => {
-      const placeholderSub = 'auth0|placeholder-sub';
-      const realSub = 'auth0|real-admin-sub';
+    it('should link admin record by email when user_profile_id differs', async () => {
+      const placeholderId = '9b9a1234-1234-1234-1234-123456789abc';
+      const realId = 'a1b2c3d4-5678-90ab-cdef-123456789def';
      const email = 'link-admin@example.com';

      await pool.query(`
-        INSERT INTO admin_users (auth0_sub, email, role, created_by)
-        VALUES ($1, $2, $3, $4)
-      `, [placeholderSub, email, 'admin', testAdminAuth0Sub]);
+        INSERT INTO admin_users (id, user_profile_id, email, role, created_by)
+        VALUES ($1, $2, $3, $4, $5)
+      `, [placeholderId, placeholderId, email, 'admin', testAdminId]);

      currentUser = {
-        sub: realSub,
+        sub: 'auth0|real-admin-sub',
        email,
      };

-      const response = await request(app)
+      const response = await request(app.server)
        .get('/api/admin/verify')
        .expect(200);

      expect(response.body.isAdmin).toBe(true);
      expect(response.body.adminRecord).toMatchObject({
-        auth0Sub: realSub,
+        userProfileId: realId,
        email,
      });

      const record = await pool.query(
-        'SELECT auth0_sub FROM admin_users WHERE email = $1',
+        'SELECT user_profile_id FROM admin_users WHERE email = $1',
        [email]
      );
-      expect(record.rows[0].auth0_sub).toBe(realSub);
+      expect(record.rows[0].user_profile_id).toBe(realId);
    });

    it('should return non-admin response for unknown user', async () => {
@@ -154,7 +161,7 @@ describe('Admin Management Integration Tests', () => {
        email: 'non-admin@example.com',
      };

-      const response = await request(app)
+      const response = await request(app.server)
        .get('/api/admin/verify')
        .expect(200);

@@ -166,17 +173,19 @@ describe('Admin Management Integration Tests', () => {
  describe('GET /api/admin/admins', () => {
    it('should list all admin users', async () => {
      // Create additional test admins
+      const admin1Id = '6ba7b810-9dad-11d1-80b4-00c04fd430c8';
+      const admin2Id = '8f14e45f-ceea-367f-a27f-c9a6d0c67e0e';
      await pool.query(`
-        INSERT INTO admin_users (auth0_sub, email, role, created_by)
+        INSERT INTO admin_users (id, user_profile_id, email, role, created_by)
        VALUES
-        ($1, $2, $3, $4),
-        ($5, $6, $7, $8)
+        ($1, $2, $3, $4, $5),
+        ($6, $7, $8, $9, $10)
      `, [
-        'auth0|admin1', 'admin1@example.com', 'admin', testAdminAuth0Sub,
-        'auth0|admin2', 'admin2@example.com', 'super_admin', testAdminAuth0Sub
+        admin1Id, admin1Id, 'admin1@example.com', 'admin', testAdminId,
+        admin2Id, admin2Id, 'admin2@example.com', 'super_admin', testAdminId
      ]);

-      const response = await request(app)
+      const response = await request(app.server)
        .get('/api/admin/admins')
        .expect(200);

@@ -184,7 +193,7 @@ describe('Admin Management Integration Tests', () => {
      expect(response.body).toHaveProperty('admins');
      expect(response.body.admins.length).toBeGreaterThanOrEqual(3); // At least test admin + 2 created
      expect(response.body.admins[0]).toMatchObject({
-        auth0Sub: expect.any(String),
+        id: expect.any(String),
        email: expect.any(String),
        role: expect.stringMatching(/^(admin|super_admin)$/),
        createdAt: expect.any(String),
@@ -194,12 +203,13 @@ describe('Admin Management Integration Tests', () => {

    it('should include revoked admins in the list', async () => {
      // Create and revoke an admin
+      const revokedId = 'f1e2d3c4-b5a6-9788-6543-210fedcba987';
      await pool.query(`
-        INSERT INTO admin_users (auth0_sub, email, role, created_by, revoked_at)
-        VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP)
-      `, ['auth0|revoked', 'revoked@example.com', 'admin', testAdminAuth0Sub]);
+        INSERT INTO admin_users (id, user_profile_id, email, role, created_by, revoked_at)
+        VALUES ($1, $2, $3, $4, $5, CURRENT_TIMESTAMP)
+      `, [revokedId, revokedId, 'revoked@example.com', 'admin', testAdminId]);

-      const response = await request(app)
+      const response = await request(app.server)
        .get('/api/admin/admins')
        .expect(200);

@@ -218,17 +228,17 @@ describe('Admin Management Integration Tests', () => {
        role: 'admin'
      };

-      const response = await request(app)
+      const response = await request(app.server)
        .post('/api/admin/admins')
        .send(newAdminData)
        .expect(201);

      expect(response.body).toMatchObject({
-        auth0Sub: expect.any(String),
+        id: expect.any(String),
        email: 'newadmin@example.com',
        role: 'admin',
        createdAt: expect.any(String),
-        createdBy: testAdminAuth0Sub,
+        createdBy: testAdminId,
        revokedAt: null
      });

@@ -238,7 +248,7 @@ describe('Admin Management Integration Tests', () => {
        ['CREATE', 'newadmin@example.com']
      );
      expect(auditResult.rows.length).toBe(1);
-      expect(auditResult.rows[0].actor_admin_id).toBe(testAdminAuth0Sub);
+      expect(auditResult.rows[0].actor_admin_id).toBe(testAdminId);
    });

    it('should reject invalid email', async () => {
@@ -247,7 +257,7 @@ describe('Admin Management Integration Tests', () => {
        role: 'admin'
      };

-      const response = await request(app)
+      const response = await request(app.server)
        .post('/api/admin/admins')
        .send(invalidData)
        .expect(400);
@@ -263,13 +273,13 @@ describe('Admin Management Integration Tests', () => {
      };

      // Create first admin
-      await request(app)
+      await request(app.server)
        .post('/api/admin/admins')
        .send(adminData)
        .expect(201);

      // Try to create duplicate
-      const response = await request(app)
+      const response = await request(app.server)
        .post('/api/admin/admins')
        .send(adminData)
        .expect(400);
@@ -284,7 +294,7 @@ describe('Admin Management Integration Tests', () => {
        role: 'super_admin'
      };

-      const response = await request(app)
+      const response = await request(app.server)
        .post('/api/admin/admins')
        .send(superAdminData)
        .expect(201);
@@ -297,7 +307,7 @@ describe('Admin Management Integration Tests', () => {
        email: 'defaultrole@example.com'
      };

-      const response = await request(app)
+      const response = await request(app.server)
        .post('/api/admin/admins')
        .send(adminData)
        .expect(201);
@@ -306,23 +316,24 @@ describe('Admin Management Integration Tests', () => {
    });
  });

-  describe('PATCH /api/admin/admins/:auth0Sub/revoke', () => {
+  describe('PATCH /api/admin/admins/:id/revoke', () => {
    it('should revoke admin access', async () => {
      // Create admin to revoke
+      const toRevokeId = 'b1c2d3e4-f5a6-7890-1234-567890abcdef';
      const createResult = await pool.query(`
-        INSERT INTO admin_users (auth0_sub, email, role, created_by)
-        VALUES ($1, $2, $3, $4)
-        RETURNING auth0_sub
-      `, ['auth0|to-revoke', 'torevoke@example.com', 'admin', testAdminAuth0Sub]);
+        INSERT INTO admin_users (id, user_profile_id, email, role, created_by)
+        VALUES ($1, $2, $3, $4, $5)
+        RETURNING id
+      `, [toRevokeId, toRevokeId, 'torevoke@example.com', 'admin', testAdminId]);

-      const auth0Sub = createResult.rows[0].auth0_sub;
+      const adminId = createResult.rows[0].id;

-      const response = await request(app)
-        .patch(`/api/admin/admins/${auth0Sub}/revoke`)
+      const response = await request(app.server)
+        .patch(`/api/admin/admins/${adminId}/revoke`)
        .expect(200);

      expect(response.body).toMatchObject({
-        auth0Sub,
+        id: adminId,
        email: 'torevoke@example.com',
        revokedAt: expect.any(String)
      });
@@ -330,7 +341,7 @@ describe('Admin Management Integration Tests', () => {
      // Verify audit log
      const auditResult = await pool.query(
        'SELECT * FROM admin_audit_logs WHERE action = $1 AND target_admin_id = $2',
-        ['REVOKE', auth0Sub]
+        ['REVOKE', adminId]
      );
      expect(auditResult.rows.length).toBe(1);
    });
@@ -338,12 +349,12 @@ describe('Admin Management Integration Tests', () => {
    it('should prevent revoking last active admin', async () => {
      // First, ensure only one active admin exists
      await pool.query(
-        'UPDATE admin_users SET revoked_at = CURRENT_TIMESTAMP WHERE auth0_sub != $1',
-        [testAdminAuth0Sub]
+        'UPDATE admin_users SET revoked_at = CURRENT_TIMESTAMP WHERE user_profile_id != $1',
+        [testAdminId]
      );

-      const response = await request(app)
-        .patch(`/api/admin/admins/${testAdminAuth0Sub}/revoke`)
+      const response = await request(app.server)
+        .patch(`/api/admin/admins/${testAdminId}/revoke`)
        .expect(400);

      expect(response.body.error).toBe('Bad Request');
@@ -351,8 +362,8 @@ describe('Admin Management Integration Tests', () => {
    });

    it('should return 404 for non-existent admin', async () => {
-      const response = await request(app)
-        .patch('/api/admin/admins/auth0|nonexistent/revoke')
+      const response = await request(app.server)
+        .patch('/api/admin/admins/00000000-0000-0000-0000-000000000000/revoke')
        .expect(404);

      expect(response.body.error).toBe('Not Found');
@@ -360,23 +371,24 @@ describe('Admin Management Integration Tests', () => {
    });
  });

-  describe('PATCH /api/admin/admins/:auth0Sub/reinstate', () => {
+  describe('PATCH /api/admin/admins/:id/reinstate', () => {
    it('should reinstate revoked admin', async () => {
      // Create revoked admin
+      const reinstateId = 'c2d3e4f5-a6b7-8901-2345-678901bcdef0';
      const createResult = await pool.query(`
-        INSERT INTO admin_users (auth0_sub, email, role, created_by, revoked_at)
-        VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP)
-        RETURNING auth0_sub
-      `, ['auth0|to-reinstate', 'toreinstate@example.com', 'admin', testAdminAuth0Sub]);
+        INSERT INTO admin_users (id, user_profile_id, email, role, created_by, revoked_at)
+        VALUES ($1, $2, $3, $4, $5, CURRENT_TIMESTAMP)
+        RETURNING id
+      `, [reinstateId, reinstateId, 'toreinstate@example.com', 'admin', testAdminId]);

-      const auth0Sub = createResult.rows[0].auth0_sub;
+      const adminId = createResult.rows[0].id;

-      const response = await request(app)
-        .patch(`/api/admin/admins/${auth0Sub}/reinstate`)
+      const response = await request(app.server)
+        .patch(`/api/admin/admins/${adminId}/reinstate`)
        .expect(200);

      expect(response.body).toMatchObject({
-        auth0Sub,
+        id: adminId,
        email: 'toreinstate@example.com',
        revokedAt: null
      });
@@ -384,14 +396,14 @@ describe('Admin Management Integration Tests', () => {
      // Verify audit log
      const auditResult = await pool.query(
        'SELECT * FROM admin_audit_logs WHERE action = $1 AND target_admin_id = $2',
-        ['REINSTATE', auth0Sub]
+        ['REINSTATE', adminId]
      );
      expect(auditResult.rows.length).toBe(1);
    });

    it('should return 404 for non-existent admin', async () => {
-      const response = await request(app)
-        .patch('/api/admin/admins/auth0|nonexistent/reinstate')
+      const response = await request(app.server)
+        .patch('/api/admin/admins/00000000-0000-0000-0000-000000000000/reinstate')
        .expect(404);

      expect(response.body.error).toBe('Not Found');
@@ -400,16 +412,17 @@ describe('Admin Management Integration Tests', () => {

    it('should handle reinstating already active admin', async () => {
      // Create active admin
+      const activeId = 'd3e4f5a6-b7c8-9012-3456-789012cdef01';
      const createResult = await pool.query(`
-        INSERT INTO admin_users (auth0_sub, email, role, created_by)
-        VALUES ($1, $2, $3, $4)
-        RETURNING auth0_sub
-      `, ['auth0|already-active', 'active@example.com', 'admin', testAdminAuth0Sub]);
+        INSERT INTO admin_users (id, user_profile_id, email, role, created_by)
+        VALUES ($1, $2, $3, $4, $5)
+        RETURNING id
+      `, [activeId, activeId, 'active@example.com', 'admin', testAdminId]);

-      const auth0Sub = createResult.rows[0].auth0_sub;
+      const adminId = createResult.rows[0].id;

-      const response = await request(app)
-        .patch(`/api/admin/admins/${auth0Sub}/reinstate`)
+      const response = await request(app.server)
+        .patch(`/api/admin/admins/${adminId}/reinstate`)
        .expect(200);

      expect(response.body.revokedAt).toBeNull();
@@ -426,12 +439,12 @@ describe('Admin Management Integration Tests', () => {
        ($5, $6, $7, $8),
        ($9, $10, $11, $12)
      `, [
-        testAdminAuth0Sub, 'CREATE', 'admin_user', 'test1@example.com',
-        testAdminAuth0Sub, 'REVOKE', 'admin_user', 'test2@example.com',
-        testAdminAuth0Sub, 'REINSTATE', 'admin_user', 'test3@example.com'
+        testAdminId, 'CREATE', 'admin_user', 'test1@example.com',
+        testAdminId, 'REVOKE', 'admin_user', 'test2@example.com',
+        testAdminId, 'REINSTATE', 'admin_user', 'test3@example.com'
      ]);

-      const response = await request(app)
+      const response = await request(app.server)
        .get('/api/admin/audit-logs')
        .expect(200);

@@ -440,7 +453,7 @@ describe('Admin Management Integration Tests', () => {
      expect(response.body.logs.length).toBeGreaterThanOrEqual(3);
      expect(response.body.logs[0]).toMatchObject({
        id: expect.any(String),
-        actorAdminId: testAdminAuth0Sub,
+        actorAdminId: testAdminId,
        action: expect.any(String),
        resourceType: expect.any(String),
        createdAt: expect.any(String)
@@ -453,10 +466,10 @@ describe('Admin Management Integration Tests', () => {
        await pool.query(`
          INSERT INTO admin_audit_logs (actor_admin_id, action, resource_type, resource_id)
          VALUES ($1, $2, $3, $4)
-        `, [testAdminAuth0Sub, 'CREATE', 'admin_user', `test${i}@example.com`]);
+        `, [testAdminId, 'CREATE', 'admin_user', `test${i}@example.com`]);
      }

-      const response = await request(app)
+      const response = await request(app.server)
        .get('/api/admin/audit-logs?limit=5&offset=0')
        .expect(200);

@@ -473,12 +486,12 @@ describe('Admin Management Integration Tests', () => {
        ($3, $4, CURRENT_TIMESTAMP - INTERVAL '1 minute'),
        ($5, $6, CURRENT_TIMESTAMP)
      `, [
-        testAdminAuth0Sub, 'FIRST',
-        testAdminAuth0Sub, 'SECOND',
-        testAdminAuth0Sub, 'THIRD'
+        testAdminId, 'FIRST',
+        testAdminId, 'SECOND',
+        testAdminId, 'THIRD'
      ]);

-      const response = await request(app)
+      const response = await request(app.server)
        .get('/api/admin/audit-logs?limit=3')
        .expect(200);

@@ -491,45 +504,45 @@ describe('Admin Management Integration Tests', () => {
  describe('End-to-end workflow', () => {
    it('should create, revoke, and reinstate admin with full audit trail', async () => {
      // 1. Create new admin
-      const createResponse = await request(app)
+      const createResponse = await request(app.server)
        .post('/api/admin/admins')
        .send({ email: 'workflow@example.com', role: 'admin' })
        .expect(201);

-      const auth0Sub = createResponse.body.auth0Sub;
+      const adminId = createResponse.body.id;

      // 2. Verify admin appears in list
-      const listResponse = await request(app)
+      const listResponse = await request(app.server)
        .get('/api/admin/admins')
        .expect(200);

      const createdAdmin = listResponse.body.admins.find(
-        (admin: any) => admin.auth0Sub === auth0Sub
+        (admin: any) => admin.id === adminId
      );
      expect(createdAdmin).toBeDefined();
      expect(createdAdmin.revokedAt).toBeNull();

      // 3. Revoke admin
-      const revokeResponse = await request(app)
-        .patch(`/api/admin/admins/${auth0Sub}/revoke`)
+      const revokeResponse = await request(app.server)
+        .patch(`/api/admin/admins/${adminId}/revoke`)
        .expect(200);

      expect(revokeResponse.body.revokedAt).toBeTruthy();

      // 4. Reinstate admin
-      const reinstateResponse = await request(app)
-        .patch(`/api/admin/admins/${auth0Sub}/reinstate`)
+      const reinstateResponse = await request(app.server)
+        .patch(`/api/admin/admins/${adminId}/reinstate`)
        .expect(200);

      expect(reinstateResponse.body.revokedAt).toBeNull();

      // 5. Verify complete audit trail
-      const auditResponse = await request(app)
+      const auditResponse = await request(app.server)
        .get('/api/admin/audit-logs')
        .expect(200);

      const workflowLogs = auditResponse.body.logs.filter(
-        (log: any) => log.targetAdminId === auth0Sub || log.resourceId === 'workflow@example.com'
+        (log: any) => log.targetAdminId === adminId || log.resourceId === 'workflow@example.com'
      );

      expect(workflowLogs.length).toBeGreaterThanOrEqual(3);
--- a/backend/src/features/admin/tests/unit/admin.guard.test.ts
+++ b/backend/src/features/admin/tests/unit/admin.guard.test.ts
@@ -26,9 +26,12 @@ describe('admin guard plugin', () => {
    fastify = Fastify();
    authenticateMock = jest.fn(async (request: FastifyRequest) => {
      request.userContext = {
-        userId: 'auth0|admin',
+        userId: '7c9e6679-7425-40de-944b-e07fc1f90ae7',
        email: 'admin@motovaultpro.com',
+        emailVerified: true,
+        onboardingCompleted: true,
        isAdmin: false,
+        subscriptionTier: 'free',
      };
    });
    fastify.decorate('authenticate', authenticateMock);
@@ -38,7 +41,7 @@ describe('admin guard plugin', () => {
    mockPool = {
      query: jest.fn().mockResolvedValue({
        rows: [{
-          auth0_sub: 'auth0|admin',
+          user_profile_id: '7c9e6679-7425-40de-944b-e07fc1f90ae7',
          email: 'admin@motovaultpro.com',
          role: 'admin',
          revoked_at: null,
--- a/backend/src/features/admin/tests/unit/admin.service.test.ts
+++ b/backend/src/features/admin/tests/unit/admin.service.test.ts
@@ -6,13 +6,23 @@
 import { AdminService } from '../../domain/admin.service';
 import { AdminRepository } from '../../data/admin.repository';

+// Mock the audit log service
+jest.mock('../../../audit-log', () => ({
+  auditLogService: {
+    info: jest.fn().mockResolvedValue(undefined),
+    warn: jest.fn().mockResolvedValue(undefined),
+    error: jest.fn().mockResolvedValue(undefined),
+  },
+}));
+
 describe('AdminService', () => {
  let adminService: AdminService;
  let mockRepository: jest.Mocked<AdminRepository>;

  beforeEach(() => {
    mockRepository = {
-      getAdminByAuth0Sub: jest.fn(),
+      getAdminById: jest.fn(),
+      getAdminByUserProfileId: jest.fn(),
      getAdminByEmail: jest.fn(),
      getAllAdmins: jest.fn(),
      getActiveAdmins: jest.fn(),
@@ -26,30 +36,31 @@ describe('AdminService', () => {
    adminService = new AdminService(mockRepository);
  });

-  describe('getAdminByAuth0Sub', () => {
+  describe('getAdminById', () => {
    it('should return admin when found', async () => {
      const mockAdmin = {
-        auth0Sub: 'auth0|123456',
+        id: '7c9e6679-7425-40de-944b-e07fc1f90ae7',
+        userProfileId: '7c9e6679-7425-40de-944b-e07fc1f90ae7',
        email: 'admin@motovaultpro.com',
-        role: 'admin',
+        role: 'admin' as const,
        createdAt: new Date(),
-        createdBy: 'system',
+        createdBy: '550e8400-e29b-41d4-a716-446655440000',
        revokedAt: null,
        updatedAt: new Date(),
      };

-      mockRepository.getAdminByAuth0Sub.mockResolvedValue(mockAdmin);
+      mockRepository.getAdminById.mockResolvedValue(mockAdmin);

-      const result = await adminService.getAdminByAuth0Sub('auth0|123456');
+      const result = await adminService.getAdminById('7c9e6679-7425-40de-944b-e07fc1f90ae7');

      expect(result).toEqual(mockAdmin);
-      expect(mockRepository.getAdminByAuth0Sub).toHaveBeenCalledWith('auth0|123456');
+      expect(mockRepository.getAdminById).toHaveBeenCalledWith('7c9e6679-7425-40de-944b-e07fc1f90ae7');
    });

    it('should return null when admin not found', async () => {
-      mockRepository.getAdminByAuth0Sub.mockResolvedValue(null);
+      mockRepository.getAdminById.mockResolvedValue(null);

-      const result = await adminService.getAdminByAuth0Sub('auth0|unknown');
+      const result = await adminService.getAdminById('00000000-0000-0000-0000-000000000000');

      expect(result).toBeNull();
    });
@@ -57,12 +68,15 @@ describe('AdminService', () => {

  describe('createAdmin', () => {
    it('should create new admin and log audit', async () => {
+      const newAdminId = '8f14e45f-ceea-367f-a27f-c9a6d0c67e0e';
+      const creatorId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
      const mockAdmin = {
-        auth0Sub: 'auth0|newadmin',
+        id: newAdminId,
+        userProfileId: newAdminId,
        email: 'newadmin@motovaultpro.com',
-        role: 'admin',
+        role: 'admin' as const,
        createdAt: new Date(),
-        createdBy: 'auth0|existing',
+        createdBy: creatorId,
        revokedAt: null,
        updatedAt: new Date(),
      };
@@ -74,16 +88,16 @@ describe('AdminService', () => {
      const result = await adminService.createAdmin(
        'newadmin@motovaultpro.com',
        'admin',
-        'auth0|newadmin',
-        'auth0|existing'
+        newAdminId,
+        creatorId
      );

      expect(result).toEqual(mockAdmin);
      expect(mockRepository.createAdmin).toHaveBeenCalled();
      expect(mockRepository.logAuditAction).toHaveBeenCalledWith(
-        'auth0|existing',
+        creatorId,
        'CREATE',
-        mockAdmin.auth0Sub,
+        mockAdmin.id,
        'admin_user',
        mockAdmin.email,
        expect.any(Object)
@@ -91,12 +105,14 @@ describe('AdminService', () => {
    });

    it('should reject if admin already exists', async () => {
+      const existingId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
      const existingAdmin = {
-        auth0Sub: 'auth0|existing',
+        id: existingId,
+        userProfileId: existingId,
        email: 'admin@motovaultpro.com',
-        role: 'admin',
+        role: 'admin' as const,
        createdAt: new Date(),
-        createdBy: 'system',
+        createdBy: '550e8400-e29b-41d4-a716-446655440000',
        revokedAt: null,
        updatedAt: new Date(),
      };
@@ -104,39 +120,46 @@ describe('AdminService', () => {
      mockRepository.getAdminByEmail.mockResolvedValue(existingAdmin);

      await expect(
-        adminService.createAdmin('admin@motovaultpro.com', 'admin', 'auth0|new', 'auth0|existing')
+        adminService.createAdmin('admin@motovaultpro.com', 'admin', '8f14e45f-ceea-367f-a27f-c9a6d0c67e0e', existingId)
      ).rejects.toThrow('already exists');
    });
  });

  describe('revokeAdmin', () => {
    it('should revoke admin when multiple active admins exist', async () => {
+      const toRevokeId = 'a1b2c3d4-e5f6-7890-1234-567890abcdef';
+      const admin1Id = '6ba7b810-9dad-11d1-80b4-00c04fd430c8';
+      const admin2Id = '8f14e45f-ceea-367f-a27f-c9a6d0c67e0e';
+
      const revokedAdmin = {
-        auth0Sub: 'auth0|toadmin',
+        id: toRevokeId,
+        userProfileId: toRevokeId,
        email: 'toadmin@motovaultpro.com',
-        role: 'admin',
+        role: 'admin' as const,
        createdAt: new Date(),
-        createdBy: 'system',
+        createdBy: '550e8400-e29b-41d4-a716-446655440000',
        revokedAt: new Date(),
        updatedAt: new Date(),
      };

      const activeAdmins = [
        {
-          auth0Sub: 'auth0|admin1',
+          id: admin1Id,
+          userProfileId: admin1Id,
          email: 'admin1@motovaultpro.com',
-          role: 'admin',
+          role: 'admin' as const,
          createdAt: new Date(),
-          createdBy: 'system',
+          createdBy: '550e8400-e29b-41d4-a716-446655440000',
          revokedAt: null,
          updatedAt: new Date(),
        },
        {
-          auth0Sub: 'auth0|admin2',
+          id: admin2Id,
+          userProfileId: admin2Id,
          email: 'admin2@motovaultpro.com',
-          role: 'admin',
+          role: 'admin' as const,
          createdAt: new Date(),
-          createdBy: 'system',
+          createdBy: '550e8400-e29b-41d4-a716-446655440000',
          revokedAt: null,
          updatedAt: new Date(),
        },
@@ -146,20 +169,22 @@ describe('AdminService', () => {
      mockRepository.revokeAdmin.mockResolvedValue(revokedAdmin);
      mockRepository.logAuditAction.mockResolvedValue({} as any);

-      const result = await adminService.revokeAdmin('auth0|toadmin', 'auth0|admin1');
+      const result = await adminService.revokeAdmin(toRevokeId, admin1Id);

      expect(result).toEqual(revokedAdmin);
-      expect(mockRepository.revokeAdmin).toHaveBeenCalledWith('auth0|toadmin');
+      expect(mockRepository.revokeAdmin).toHaveBeenCalledWith(toRevokeId);
      expect(mockRepository.logAuditAction).toHaveBeenCalled();
    });

    it('should prevent revoking last active admin', async () => {
+      const lastAdminId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
      const lastAdmin = {
-        auth0Sub: 'auth0|lastadmin',
+        id: lastAdminId,
+        userProfileId: lastAdminId,
        email: 'last@motovaultpro.com',
-        role: 'admin',
+        role: 'admin' as const,
        createdAt: new Date(),
-        createdBy: 'system',
+        createdBy: '550e8400-e29b-41d4-a716-446655440000',
        revokedAt: null,
        updatedAt: new Date(),
      };
@@ -167,19 +192,22 @@ describe('AdminService', () => {
      mockRepository.getActiveAdmins.mockResolvedValue([lastAdmin]);

      await expect(
-        adminService.revokeAdmin('auth0|lastadmin', 'auth0|lastadmin')
+        adminService.revokeAdmin(lastAdminId, lastAdminId)
      ).rejects.toThrow('Cannot revoke the last active admin');
    });
  });

  describe('reinstateAdmin', () => {
    it('should reinstate revoked admin and log audit', async () => {
+      const reinstateId = 'b2c3d4e5-f6a7-8901-2345-678901bcdef0';
+      const adminActorId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
      const reinstatedAdmin = {
-        auth0Sub: 'auth0|reinstate',
+        id: reinstateId,
+        userProfileId: reinstateId,
        email: 'reinstate@motovaultpro.com',
-        role: 'admin',
+        role: 'admin' as const,
        createdAt: new Date(),
-        createdBy: 'system',
+        createdBy: '550e8400-e29b-41d4-a716-446655440000',
        revokedAt: null,
        updatedAt: new Date(),
      };
@@ -187,14 +215,14 @@ describe('AdminService', () => {
      mockRepository.reinstateAdmin.mockResolvedValue(reinstatedAdmin);
      mockRepository.logAuditAction.mockResolvedValue({} as any);

-      const result = await adminService.reinstateAdmin('auth0|reinstate', 'auth0|admin');
+      const result = await adminService.reinstateAdmin(reinstateId, adminActorId);

      expect(result).toEqual(reinstatedAdmin);
-      expect(mockRepository.reinstateAdmin).toHaveBeenCalledWith('auth0|reinstate');
+      expect(mockRepository.reinstateAdmin).toHaveBeenCalledWith(reinstateId);
      expect(mockRepository.logAuditAction).toHaveBeenCalledWith(
-        'auth0|admin',
+        adminActorId,
        'REINSTATE',
-        'auth0|reinstate',
+        reinstateId,
        'admin_user',
        reinstatedAdmin.email
      );
--- a/backend/src/features/audit-log/CLAUDE.md
+++ b/backend/src/features/audit-log/CLAUDE.md
@@ -0,0 +1,19 @@
+# audit-log/
+
+## Files
+
+| File | What | When to read |
+| ---- | ---- | ------------ |
+| `README.md` | Architecture, usage patterns, categories | Understanding audit log system |
+| `audit-log.instance.ts` | Singleton service instance | Cross-feature logging integration |
+
+## Subdirectories
+
+| Directory | What | When to read |
+| --------- | ---- | ------------ |
+| `api/` | HTTP endpoints for log viewing/export | API route changes |
+| `domain/` | Business logic, types, service | Core audit logging logic |
+| `data/` | Repository, database queries | Database operations |
+| `jobs/` | Scheduled cleanup job | Retention policy |
+| `migrations/` | Database schema | Schema changes |
+| `__tests__/` | Integration tests | Adding or modifying tests |
--- a/backend/src/features/audit-log/README.md
+++ b/backend/src/features/audit-log/README.md
@@ -0,0 +1,168 @@
+# Audit Log Feature
+
+Centralized audit logging system for tracking all user and system actions across MotoVaultPro.
+
+## Architecture
+
+```
+                        Frontend
+  +--------------+  +-------------------+
+  | AdminLogsPage|  | AdminLogsMobile   |
+  | (desktop)    |  | Screen (mobile)   |
+  +------+-------+  +--------+----------+
+         |                   |
+         +-------------------+
+                 |
+                 | useAuditLogs hook
+                 v
+           adminApi.unifiedAuditLogs
+                 |
+                 | HTTP
+                 v
+  GET /api/admin/audit-logs?search=X&category=Y&...
+  GET /api/admin/audit-logs/export
+                 |
+        +--------v--------+
+        | AuditLogController |
+        +--------+--------+
+                 |
+        +--------v--------+
+        |  AuditLogService  |<----- Other services call
+        |  log(category,...)|       auditLogService.info()
+        +--------+--------+
+                 |
+        +--------v--------+
+        | AuditLogRepository |
+        +--------+--------+
+                 v
+          +-------------+
+          |  audit_logs | (PostgreSQL)
+          +-------------+
+```
+
+## Data Flow
+
+```
+Feature Service (vehicles, auth, etc.)
+        |
+        | auditLogService.info(category, userId, action, resourceType?, resourceId?, details?)
+        v
+  AuditLogService
+        |
+        | INSERT INTO audit_logs
+        v
+  PostgreSQL audit_logs table
+        |
+        | GET /api/admin/audit-logs (with filters)
+        v
+  AdminLogsPage/Mobile displays filtered, paginated results
+```
+
+## Database Schema
+
+```sql
+CREATE TABLE audit_logs (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  category VARCHAR(20) NOT NULL CHECK (category IN ('auth', 'vehicle', 'user', 'system', 'admin')),
+  severity VARCHAR(10) NOT NULL CHECK (severity IN ('info', 'warning', 'error')),
+  user_id VARCHAR(255),        -- NULL for system-initiated actions
+  action VARCHAR(500) NOT NULL,
+  resource_type VARCHAR(100),
+  resource_id VARCHAR(255),
+  details JSONB,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+```
+
+## Indexes
+
+- `idx_audit_logs_category_created` - B-tree for category filtering
+- `idx_audit_logs_severity_created` - B-tree for severity filtering
+- `idx_audit_logs_user_created` - B-tree for user filtering
+- `idx_audit_logs_created` - B-tree for date ordering
+- `idx_audit_logs_action_gin` - GIN trigram for text search
+
+## API Endpoints
+
+### GET /api/admin/audit-logs
+
+Returns paginated audit logs with optional filters.
+
+**Query Parameters:**
+- `search` - Text search on action field (ILIKE)
+- `category` - Filter by category (auth, vehicle, user, system, admin)
+- `severity` - Filter by severity (info, warning, error)
+- `startDate` - ISO date string for date range start
+- `endDate` - ISO date string for date range end
+- `limit` - Page size (default 25, max 100)
+- `offset` - Pagination offset
+
+**Response:**
+```json
+{
+  "logs": [
+    {
+      "id": "uuid",
+      "category": "vehicle",
+      "severity": "info",
+      "userId": "auth0|...",
+      "action": "Vehicle created: 2024 Toyota Camry",
+      "resourceType": "vehicle",
+      "resourceId": "vehicle-uuid",
+      "details": { "vin": "...", "make": "Toyota" },
+      "createdAt": "2024-01-15T10:30:00Z"
+    }
+  ],
+  "total": 150,
+  "limit": 25,
+  "offset": 0
+}
+```
+
+### GET /api/admin/audit-logs/export
+
+Returns CSV file with filtered audit logs.
+
+**Query Parameters:** Same as list endpoint (except pagination)
+
+**Response:** CSV file download
+
+## Usage in Features
+
+```typescript
+import { auditLogService } from '../../audit-log';
+
+// In vehicles.service.ts
+await auditLogService.info(
+  'vehicle',
+  userId,
+  `Vehicle created: ${vehicleDesc}`,
+  'vehicle',
+  vehicleId,
+  { vin, make, model, year }
+).catch(err => logger.error('Failed to log audit event', { error: err }));
+```
+
+## Retention Policy
+
+- Logs older than 90 days are automatically deleted
+- Cleanup job runs daily at 3 AM
+- Implemented in `jobs/cleanup.job.ts`
+
+## Categories
+
+| Category | Description | Examples |
+|----------|-------------|----------|
+| `auth` | Authentication events | Signup, password reset |
+| `vehicle` | Vehicle CRUD | Create, update, delete |
+| `user` | User management | Profile updates |
+| `system` | System operations | Backup, restore |
+| `admin` | Admin actions | Grant/revoke admin |
+
+## Severity Levels
+
+| Level | Color (UI) | Description |
+|-------|------------|-------------|
+| `info` | Blue | Normal operations |
+| `warning` | Yellow | Potential issues |
+| `error` | Red | Failed operations |
--- a/backend/src/features/audit-log/tests/audit-log.integration.test.ts
+++ b/backend/src/features/audit-log/tests/audit-log.integration.test.ts
@@ -0,0 +1,308 @@
+/**
+ * @ai-summary Integration tests for audit log wiring across features
+ * @ai-context Verifies audit logging is properly integrated into auth, vehicle, admin, and backup features
+ */
+
+import { Pool } from 'pg';
+import { appConfig } from '../../../core/config/config-loader';
+import { AuditLogService } from '../domain/audit-log.service';
+import { AuditLogRepository } from '../data/audit-log.repository';
+
+describe('AuditLog Feature Integration', () => {
+  let pool: Pool;
+  let repository: AuditLogRepository;
+  let service: AuditLogService;
+  const createdIds: string[] = [];
+
+  beforeAll(async () => {
+    pool = new Pool({
+      connectionString: appConfig.getDatabaseUrl(),
+    });
+    repository = new AuditLogRepository(pool);
+    service = new AuditLogService(repository);
+  });
+
+  afterAll(async () => {
+    // Cleanup test data
+    if (createdIds.length > 0) {
+      await pool.query(`DELETE FROM audit_logs WHERE id = ANY($1::uuid[])`, [createdIds]);
+    }
+    await pool.end();
+  });
+
+  describe('Vehicle logging integration', () => {
+    it('should create audit log with vehicle category and correct resource', async () => {
+      const userId = '550e8400-e29b-41d4-a716-446655440000';
+      const vehicleId = 'vehicle-uuid-123';
+      const entry = await service.info(
+        'vehicle',
+        userId,
+        'Vehicle created: 2024 Toyota Camry',
+        'vehicle',
+        vehicleId,
+        { vin: '1HGBH41JXMN109186', make: 'Toyota', model: 'Camry', year: 2024 }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('vehicle');
+      expect(entry.severity).toBe('info');
+      expect(entry.userId).toBe(userId);
+      expect(entry.action).toContain('Vehicle created');
+      expect(entry.resourceType).toBe('vehicle');
+      expect(entry.resourceId).toBe(vehicleId);
+      expect(entry.details).toHaveProperty('vin');
+      expect(entry.details).toHaveProperty('make', 'Toyota');
+    });
+
+    it('should log vehicle update with correct fields', async () => {
+      const userId = '6ba7b810-9dad-11d1-80b4-00c04fd430c8';
+      const vehicleId = 'vehicle-uuid-456';
+      const entry = await service.info(
+        'vehicle',
+        userId,
+        'Vehicle updated: 2024 Toyota Camry',
+        'vehicle',
+        vehicleId,
+        { updatedFields: ['color', 'licensePlate'] }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('vehicle');
+      expect(entry.action).toContain('Vehicle updated');
+      expect(entry.details).toHaveProperty('updatedFields');
+    });
+
+    it('should log vehicle deletion with vehicle info', async () => {
+      const userId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
+      const vehicleId = 'vehicle-uuid-789';
+      const entry = await service.info(
+        'vehicle',
+        userId,
+        'Vehicle deleted: 2024 Toyota Camry',
+        'vehicle',
+        vehicleId,
+        { vin: '1HGBH41JXMN109186', make: 'Toyota', model: 'Camry', year: 2024 }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('vehicle');
+      expect(entry.action).toContain('Vehicle deleted');
+      expect(entry.resourceId).toBe(vehicleId);
+    });
+  });
+
+  describe('Auth logging integration', () => {
+    it('should create audit log with auth category for signup', async () => {
+      const userId = '550e8400-e29b-41d4-a716-446655440000';
+      const entry = await service.info(
+        'auth',
+        userId,
+        'User signup: test@example.com',
+        'user',
+        userId,
+        { email: 'test@example.com', ipAddress: '192.168.1.1' }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('auth');
+      expect(entry.severity).toBe('info');
+      expect(entry.userId).toBe(userId);
+      expect(entry.action).toContain('signup');
+      expect(entry.resourceType).toBe('user');
+    });
+
+    it('should create audit log for password reset request', async () => {
+      const userId = '6ba7b810-9dad-11d1-80b4-00c04fd430c8';
+      const entry = await service.info(
+        'auth',
+        userId,
+        'Password reset requested',
+        'user',
+        userId
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('auth');
+      expect(entry.action).toBe('Password reset requested');
+    });
+  });
+
+  describe('Admin logging integration', () => {
+    it('should create audit log for admin user creation', async () => {
+      const adminId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
+      const targetAdminId = '8f14e45f-ceea-367f-a27f-c9a6d0c67e0e';
+      const entry = await service.info(
+        'admin',
+        adminId,
+        'Admin user created: newadmin@example.com',
+        'admin_user',
+        targetAdminId,
+        { email: 'newadmin@example.com', role: 'admin' }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('admin');
+      expect(entry.severity).toBe('info');
+      expect(entry.userId).toBe(adminId);
+      expect(entry.action).toContain('Admin user created');
+      expect(entry.resourceType).toBe('admin_user');
+      expect(entry.details).toHaveProperty('role', 'admin');
+    });
+
+    it('should create audit log for admin revocation', async () => {
+      const adminId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
+      const targetAdminId = 'a1b2c3d4-e5f6-7890-1234-567890abcdef';
+      const entry = await service.info(
+        'admin',
+        adminId,
+        'Admin user revoked: revoked@example.com',
+        'admin_user',
+        targetAdminId,
+        { email: 'revoked@example.com' }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('admin');
+      expect(entry.action).toContain('Admin user revoked');
+    });
+
+    it('should create audit log for admin reinstatement', async () => {
+      const adminId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
+      const targetAdminId = 'b2c3d4e5-f6a7-8901-2345-678901bcdef0';
+      const entry = await service.info(
+        'admin',
+        adminId,
+        'Admin user reinstated: reinstated@example.com',
+        'admin_user',
+        targetAdminId,
+        { email: 'reinstated@example.com' }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('admin');
+      expect(entry.action).toContain('Admin user reinstated');
+    });
+  });
+
+  describe('Backup/System logging integration', () => {
+    it('should create audit log for backup creation', async () => {
+      const adminId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
+      const backupId = 'backup-uuid-123';
+      const entry = await service.info(
+        'system',
+        adminId,
+        'Backup created: Manual backup',
+        'backup',
+        backupId,
+        { name: 'Manual backup', includeDocuments: true }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('system');
+      expect(entry.severity).toBe('info');
+      expect(entry.action).toContain('Backup created');
+      expect(entry.resourceType).toBe('backup');
+      expect(entry.resourceId).toBe(backupId);
+    });
+
+    it('should create audit log for backup restore', async () => {
+      const adminId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
+      const backupId = 'backup-uuid-456';
+      const entry = await service.info(
+        'system',
+        adminId,
+        'Backup restored: backup-uuid-456',
+        'backup',
+        backupId,
+        { safetyBackupId: 'safety-backup-uuid' }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('system');
+      expect(entry.action).toContain('Backup restored');
+    });
+
+    it('should create error-level audit log for backup failure', async () => {
+      const adminId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
+      const backupId = 'backup-uuid-789';
+      const entry = await service.error(
+        'system',
+        adminId,
+        'Backup failed: Daily backup',
+        'backup',
+        backupId,
+        { error: 'Disk full' }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('system');
+      expect(entry.severity).toBe('error');
+      expect(entry.action).toContain('Backup failed');
+      expect(entry.details).toHaveProperty('error', 'Disk full');
+    });
+
+    it('should create error-level audit log for restore failure', async () => {
+      const adminId = '7c9e6679-7425-40de-944b-e07fc1f90ae7';
+      const backupId = 'backup-uuid-restore-fail';
+      const entry = await service.error(
+        'system',
+        adminId,
+        'Backup restore failed: backup-uuid-restore-fail',
+        'backup',
+        backupId,
+        { error: 'Corrupted archive', safetyBackupId: 'safety-uuid' }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.category).toBe('system');
+      expect(entry.severity).toBe('error');
+      expect(entry.action).toContain('restore failed');
+    });
+  });
+
+  describe('Cross-feature audit log queries', () => {
+    it('should be able to filter logs by category', async () => {
+      // Search for vehicle logs
+      const vehicleResult = await service.search(
+        { category: 'vehicle' },
+        { limit: 100, offset: 0 }
+      );
+
+      expect(vehicleResult.logs.length).toBeGreaterThan(0);
+      expect(vehicleResult.logs.every((log) => log.category === 'vehicle')).toBe(true);
+    });
+
+    it('should be able to search across all categories', async () => {
+      const result = await service.search(
+        { search: 'created' },
+        { limit: 100, offset: 0 }
+      );
+
+      expect(result.logs.length).toBeGreaterThan(0);
+      // Should find logs from vehicle and admin categories
+      const categories = new Set(result.logs.map((log) => log.category));
+      expect(categories.size).toBeGreaterThanOrEqual(1);
+    });
+
+    it('should be able to filter by severity across categories', async () => {
+      const errorResult = await service.search(
+        { severity: 'error' },
+        { limit: 100, offset: 0 }
+      );
+
+      expect(errorResult.logs.every((log) => log.severity === 'error')).toBe(true);
+    });
+  });
+});
--- a/backend/src/features/audit-log/tests/audit-log.routes.test.ts
+++ b/backend/src/features/audit-log/tests/audit-log.routes.test.ts
@@ -0,0 +1,126 @@
+/**
+ * @ai-summary Integration tests for audit log API routes
+ * @ai-context Tests endpoints with authentication, filtering, and export
+ */
+
+import { FastifyInstance } from 'fastify';
+import { Pool } from 'pg';
+import { appConfig } from '../../../core/config/config-loader';
+
+// Mock the authentication for testing
+const mockAdminUser = {
+  userId: 'admin-test-user',
+  email: 'admin@test.com',
+  isAdmin: true,
+};
+
+describe('Audit Log Routes', () => {
+  let app: FastifyInstance;
+  let pool: Pool;
+  const createdIds: string[] = [];
+
+  beforeAll(async () => {
+    // Import and build app
+    const { default: buildApp } = await import('../../../app');
+    app = await buildApp();
+
+    pool = new Pool({
+      connectionString: appConfig.getDatabaseUrl(),
+    });
+
+    // Create test data
+    const testLogs = [
+      { category: 'auth', severity: 'info', action: 'User logged in', user_id: 'user-1' },
+      { category: 'auth', severity: 'warning', action: 'Failed login attempt', user_id: 'user-2' },
+      { category: 'vehicle', severity: 'info', action: 'Vehicle created', user_id: 'user-1' },
+      { category: 'admin', severity: 'error', action: 'Admin action failed', user_id: 'admin-1' },
+    ];
+
+    for (const log of testLogs) {
+      const result = await pool.query(
+        `INSERT INTO audit_logs (category, severity, action, user_id)
+         VALUES ($1, $2, $3, $4) RETURNING id`,
+        [log.category, log.severity, log.action, log.user_id]
+      );
+      createdIds.push(result.rows[0].id);
+    }
+  });
+
+  afterAll(async () => {
+    // Cleanup test data
+    if (createdIds.length > 0) {
+      await pool.query(`DELETE FROM audit_logs WHERE id = ANY($1::uuid[])`, [createdIds]);
+    }
+    await pool.end();
+    await app.close();
+  });
+
+  describe('GET /api/admin/audit-logs', () => {
+    it('should return 403 for non-admin users', async () => {
+      const response = await app.inject({
+        method: 'GET',
+        url: '/api/admin/audit-logs',
+        headers: {
+          authorization: 'Bearer non-admin-token',
+        },
+      });
+
+      expect(response.statusCode).toBe(401);
+    });
+
+    it('should return paginated results for admin', async () => {
+      // This test requires proper auth mocking which depends on the app setup
+      // In a real test environment, you'd mock the auth middleware
+      const response = await app.inject({
+        method: 'GET',
+        url: '/api/admin/audit-logs',
+        // Would need proper auth headers
+      });
+
+      // Without proper auth, expect 401
+      expect([200, 401]).toContain(response.statusCode);
+    });
+
+    it('should validate category parameter', async () => {
+      const response = await app.inject({
+        method: 'GET',
+        url: '/api/admin/audit-logs?category=invalid',
+      });
+
+      // Either 400 for invalid category or 401 for no auth
+      expect([400, 401]).toContain(response.statusCode);
+    });
+
+    it('should validate severity parameter', async () => {
+      const response = await app.inject({
+        method: 'GET',
+        url: '/api/admin/audit-logs?severity=invalid',
+      });
+
+      // Either 400 for invalid severity or 401 for no auth
+      expect([400, 401]).toContain(response.statusCode);
+    });
+  });
+
+  describe('GET /api/admin/audit-logs/export', () => {
+    it('should return 401 for non-admin users', async () => {
+      const response = await app.inject({
+        method: 'GET',
+        url: '/api/admin/audit-logs/export',
+      });
+
+      expect(response.statusCode).toBe(401);
+    });
+  });
+
+  describe('AuditLogController direct tests', () => {
+    // Test the controller directly without auth
+    it('should build valid CSV output', async () => {
+      const { AuditLogController } = await import('../api/audit-log.controller');
+      const controller = new AuditLogController();
+
+      // Controller is instantiated correctly
+      expect(controller).toBeDefined();
+    });
+  });
+});
--- a/backend/src/features/audit-log/tests/audit-log.service.test.ts
+++ b/backend/src/features/audit-log/tests/audit-log.service.test.ts
@@ -0,0 +1,207 @@
+/**
+ * @ai-summary Integration tests for AuditLogService
+ * @ai-context Tests log creation, search, filtering, and cleanup
+ */
+
+import { Pool } from 'pg';
+import { appConfig } from '../../../core/config/config-loader';
+import { AuditLogService } from '../domain/audit-log.service';
+import { AuditLogRepository } from '../data/audit-log.repository';
+
+describe('AuditLogService', () => {
+  let pool: Pool;
+  let repository: AuditLogRepository;
+  let service: AuditLogService;
+  const createdIds: string[] = [];
+
+  beforeAll(async () => {
+    pool = new Pool({
+      connectionString: appConfig.getDatabaseUrl(),
+    });
+    repository = new AuditLogRepository(pool);
+    service = new AuditLogService(repository);
+  });
+
+  afterAll(async () => {
+    // Cleanup test data
+    if (createdIds.length > 0) {
+      await pool.query(`DELETE FROM audit_logs WHERE id = ANY($1::uuid[])`, [createdIds]);
+    }
+    await pool.end();
+  });
+
+  describe('log()', () => {
+    it('should create log entry with all fields', async () => {
+      const entry = await service.log(
+        'auth',
+        'info',
+        'user-123',
+        'User logged in',
+        'session',
+        'session-456',
+        { ip: '192.168.1.1', browser: 'Chrome' }
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.id).toBeDefined();
+      expect(entry.category).toBe('auth');
+      expect(entry.severity).toBe('info');
+      expect(entry.userId).toBe('user-123');
+      expect(entry.action).toBe('User logged in');
+      expect(entry.resourceType).toBe('session');
+      expect(entry.resourceId).toBe('session-456');
+      expect(entry.details).toEqual({ ip: '192.168.1.1', browser: 'Chrome' });
+      expect(entry.createdAt).toBeInstanceOf(Date);
+    });
+
+    it('should create log entry with null userId for system actions', async () => {
+      const entry = await service.log(
+        'system',
+        'info',
+        null,
+        'Scheduled backup started'
+      );
+
+      createdIds.push(entry.id);
+
+      expect(entry.id).toBeDefined();
+      expect(entry.category).toBe('system');
+      expect(entry.userId).toBeNull();
+    });
+
+    it('should throw error for invalid category', async () => {
+      await expect(
+        service.log(
+          'invalid' as any,
+          'info',
+          'user-123',
+          'Test action'
+        )
+      ).rejects.toThrow('Invalid audit log category');
+    });
+
+    it('should throw error for invalid severity', async () => {
+      await expect(
+        service.log(
+          'auth',
+          'invalid' as any,
+          'user-123',
+          'Test action'
+        )
+      ).rejects.toThrow('Invalid audit log severity');
+    });
+  });
+
+  describe('convenience methods', () => {
+    it('info() should create info-level log', async () => {
+      const entry = await service.info('vehicle', 'user-123', 'Vehicle created');
+      createdIds.push(entry.id);
+
+      expect(entry.severity).toBe('info');
+    });
+
+    it('warning() should create warning-level log', async () => {
+      const entry = await service.warning('user', 'user-123', 'Password reset requested');
+      createdIds.push(entry.id);
+
+      expect(entry.severity).toBe('warning');
+    });
+
+    it('error() should create error-level log', async () => {
+      const entry = await service.error('admin', 'admin-123', 'Failed to revoke user');
+      createdIds.push(entry.id);
+
+      expect(entry.severity).toBe('error');
+    });
+  });
+
+  describe('search()', () => {
+    beforeAll(async () => {
+      // Create test data for search
+      const testLogs = [
+        { category: 'auth', severity: 'info', action: 'Login successful' },
+        { category: 'auth', severity: 'warning', action: 'Login failed' },
+        { category: 'vehicle', severity: 'info', action: 'Vehicle created' },
+        { category: 'vehicle', severity: 'info', action: 'Vehicle updated' },
+        { category: 'admin', severity: 'error', action: 'Admin action failed' },
+      ];
+
+      for (const log of testLogs) {
+        const entry = await service.log(
+          log.category as any,
+          log.severity as any,
+          'test-user',
+          log.action
+        );
+        createdIds.push(entry.id);
+      }
+    });
+
+    it('should return paginated results', async () => {
+      const result = await service.search({}, { limit: 10, offset: 0 });
+
+      expect(result.logs).toBeInstanceOf(Array);
+      expect(result.total).toBeGreaterThan(0);
+      expect(result.limit).toBe(10);
+      expect(result.offset).toBe(0);
+    });
+
+    it('should filter by category', async () => {
+      const result = await service.search(
+        { category: 'auth' },
+        { limit: 100, offset: 0 }
+      );
+
+      expect(result.logs.length).toBeGreaterThan(0);
+      expect(result.logs.every((log) => log.category === 'auth')).toBe(true);
+    });
+
+    it('should filter by severity', async () => {
+      const result = await service.search(
+        { severity: 'error' },
+        { limit: 100, offset: 0 }
+      );
+
+      expect(result.logs.every((log) => log.severity === 'error')).toBe(true);
+    });
+
+    it('should search by action text', async () => {
+      const result = await service.search(
+        { search: 'Login' },
+        { limit: 100, offset: 0 }
+      );
+
+      expect(result.logs.length).toBeGreaterThan(0);
+      expect(result.logs.every((log) => log.action.includes('Login'))).toBe(true);
+    });
+  });
+
+  describe('cleanup()', () => {
+    it('should delete entries older than specified days', async () => {
+      // Create an old entry by directly inserting
+      await pool.query(`
+        INSERT INTO audit_logs (category, severity, action, created_at)
+        VALUES ('system', 'info', 'Old test entry', NOW() - INTERVAL '100 days')
+      `);
+
+      const deletedCount = await service.cleanup(90);
+
+      expect(deletedCount).toBeGreaterThanOrEqual(1);
+    });
+
+    it('should not delete recent entries', async () => {
+      const entry = await service.log('system', 'info', null, 'Recent entry');
+      createdIds.push(entry.id);
+
+      await service.cleanup(90);
+
+      // Verify entry still exists
+      const result = await pool.query(
+        'SELECT id FROM audit_logs WHERE id = $1',
+        [entry.id]
+      );
+      expect(result.rows.length).toBe(1);
+    });
+  });
+});
--- a/backend/src/features/audit-log/tests/migrations.test.ts
+++ b/backend/src/features/audit-log/tests/migrations.test.ts
@@ -0,0 +1,130 @@
+/**
+ * @ai-summary Integration tests for audit_logs table migration
+ * @ai-context Tests table creation, constraints, and indexes
+ */
+
+import { Pool } from 'pg';
+import { appConfig } from '../../../core/config/config-loader';
+
+describe('Audit Logs Migration', () => {
+  let pool: Pool;
+
+  beforeAll(async () => {
+    pool = new Pool({
+      connectionString: appConfig.getDatabaseUrl(),
+    });
+  });
+
+  afterAll(async () => {
+    await pool.end();
+  });
+
+  describe('Table Structure', () => {
+    it('should have audit_logs table with correct columns', async () => {
+      const result = await pool.query(`
+        SELECT column_name, data_type, is_nullable
+        FROM information_schema.columns
+        WHERE table_name = 'audit_logs'
+        ORDER BY ordinal_position
+      `);
+
+      const columns = result.rows.map((row) => row.column_name);
+      expect(columns).toContain('id');
+      expect(columns).toContain('category');
+      expect(columns).toContain('severity');
+      expect(columns).toContain('user_id');
+      expect(columns).toContain('action');
+      expect(columns).toContain('resource_type');
+      expect(columns).toContain('resource_id');
+      expect(columns).toContain('details');
+      expect(columns).toContain('created_at');
+    });
+  });
+
+  describe('CHECK Constraints', () => {
+    it('should accept valid category values', async () => {
+      const validCategories = ['auth', 'vehicle', 'user', 'system', 'admin'];
+
+      for (const category of validCategories) {
+        const result = await pool.query(
+          `INSERT INTO audit_logs (category, severity, action)
+           VALUES ($1, 'info', 'test action')
+           RETURNING id`,
+          [category]
+        );
+        expect(result.rows[0].id).toBeDefined();
+
+        // Cleanup
+        await pool.query('DELETE FROM audit_logs WHERE id = $1', [result.rows[0].id]);
+      }
+    });
+
+    it('should reject invalid category values', async () => {
+      await expect(
+        pool.query(
+          `INSERT INTO audit_logs (category, severity, action)
+           VALUES ('invalid', 'info', 'test action')`
+        )
+      ).rejects.toThrow();
+    });
+
+    it('should accept valid severity values', async () => {
+      const validSeverities = ['info', 'warning', 'error'];
+
+      for (const severity of validSeverities) {
+        const result = await pool.query(
+          `INSERT INTO audit_logs (category, severity, action)
+           VALUES ('auth', $1, 'test action')
+           RETURNING id`,
+          [severity]
+        );
+        expect(result.rows[0].id).toBeDefined();
+
+        // Cleanup
+        await pool.query('DELETE FROM audit_logs WHERE id = $1', [result.rows[0].id]);
+      }
+    });
+
+    it('should reject invalid severity values', async () => {
+      await expect(
+        pool.query(
+          `INSERT INTO audit_logs (category, severity, action)
+           VALUES ('auth', 'invalid', 'test action')`
+        )
+      ).rejects.toThrow();
+    });
+  });
+
+  describe('Nullable Columns', () => {
+    it('should allow NULL user_id for system actions', async () => {
+      const result = await pool.query(
+        `INSERT INTO audit_logs (category, severity, user_id, action)
+         VALUES ('system', 'info', NULL, 'system startup')
+         RETURNING id, user_id`
+      );
+
+      expect(result.rows[0].id).toBeDefined();
+      expect(result.rows[0].user_id).toBeNull();
+
+      // Cleanup
+      await pool.query('DELETE FROM audit_logs WHERE id = $1', [result.rows[0].id]);
+    });
+  });
+
+  describe('Indexes', () => {
+    it('should have required indexes', async () => {
+      const result = await pool.query(`
+        SELECT indexname
+        FROM pg_indexes
+        WHERE tablename = 'audit_logs'
+      `);
+
+      const indexNames = result.rows.map((row) => row.indexname);
+      expect(indexNames).toContain('idx_audit_logs_category_created');
+      expect(indexNames).toContain('idx_audit_logs_severity_created');
+      expect(indexNames).toContain('idx_audit_logs_user_created');
+      expect(indexNames).toContain('idx_audit_logs_created');
+      expect(indexNames).toContain('idx_audit_logs_action_gin');
+    });
+  });
+});
--- a/backend/src/features/audit-log/api/audit-log.controller.ts
+++ b/backend/src/features/audit-log/api/audit-log.controller.ts
@@ -0,0 +1,154 @@
+/**
+ * @ai-summary Fastify route handlers for audit log API
+ * @ai-context HTTP request/response handling for audit log search and export
+ */
+
+import { FastifyRequest, FastifyReply } from 'fastify';
+import { AuditLogService } from '../domain/audit-log.service';
+import { AuditLogRepository } from '../data/audit-log.repository';
+import { AuditLogFilters, isValidCategory, isValidSeverity } from '../domain/audit-log.types';
+import { pool } from '../../../core/config/database';
+import { logger } from '../../../core/logging/logger';
+
+interface AuditLogsQuery {
+  search?: string;
+  category?: string;
+  severity?: string;
+  startDate?: string;
+  endDate?: string;
+  limit?: string;
+  offset?: string;
+}
+
+export class AuditLogController {
+  private service: AuditLogService;
+
+  constructor() {
+    const repository = new AuditLogRepository(pool);
+    this.service = new AuditLogService(repository);
+  }
+
+  /**
+   * GET /api/admin/audit-logs - Search audit logs with filters
+   */
+  async getAuditLogs(
+    request: FastifyRequest<{ Querystring: AuditLogsQuery }>,
+    reply: FastifyReply
+  ) {
+    try {
+      const { search, category, severity, startDate, endDate, limit, offset } = request.query;
+
+      // Validate category if provided
+      if (category && !isValidCategory(category)) {
+        return reply.code(400).send({
+          error: 'Bad Request',
+          message: `Invalid category: ${category}. Valid values: auth, vehicle, user, system, admin`,
+        });
+      }
+
+      // Validate severity if provided
+      if (severity && !isValidSeverity(severity)) {
+        return reply.code(400).send({
+          error: 'Bad Request',
+          message: `Invalid severity: ${severity}. Valid values: info, warning, error`,
+        });
+      }
+
+      const filters: AuditLogFilters = {
+        search,
+        category: category as AuditLogFilters['category'],
+        severity: severity as AuditLogFilters['severity'],
+        startDate: startDate ? new Date(startDate) : undefined,
+        endDate: endDate ? new Date(endDate) : undefined,
+      };
+
+      const pagination = {
+        limit: Math.min(parseInt(limit || '50', 10), 100),
+        offset: parseInt(offset || '0', 10),
+      };
+
+      const result = await this.service.search(filters, pagination);
+
+      return reply.send(result);
+    } catch (error) {
+      logger.error('Error fetching audit logs', { error });
+      return reply.code(500).send({
+        error: 'Internal Server Error',
+        message: 'Failed to fetch audit logs',
+      });
+    }
+  }
+
+  /**
+   * GET /api/admin/audit-logs/export - Export audit logs as CSV
+   */
+  async exportAuditLogs(
+    request: FastifyRequest<{ Querystring: AuditLogsQuery }>,
+    reply: FastifyReply
+  ) {
+    try {
+      const { search, category, severity, startDate, endDate } = request.query;
+
+      // Validate category if provided
+      if (category && !isValidCategory(category)) {
+        return reply.code(400).send({
+          error: 'Bad Request',
+          message: `Invalid category: ${category}`,
+        });
+      }
+
+      // Validate severity if provided
+      if (severity && !isValidSeverity(severity)) {
+        return reply.code(400).send({
+          error: 'Bad Request',
+          message: `Invalid severity: ${severity}`,
+        });
+      }
+
+      const filters: AuditLogFilters = {
+        search,
+        category: category as AuditLogFilters['category'],
+        severity: severity as AuditLogFilters['severity'],
+        startDate: startDate ? new Date(startDate) : undefined,
+        endDate: endDate ? new Date(endDate) : undefined,
+      };
+
+      const { logs, truncated } = await this.service.getForExport(filters);
+
+      // Generate CSV
+      const headers = ['ID', 'Timestamp', 'Category', 'Severity', 'User ID', 'Action', 'Resource Type', 'Resource ID'];
+      const rows = logs.map((log) => [
+        log.id,
+        log.createdAt.toISOString(),
+        log.category,
+        log.severity,
+        log.userId || '',
+        `"${log.action.replace(/"/g, '""')}"`, // Escape quotes in CSV
+        log.resourceType || '',
+        log.resourceId || '',
+      ]);
+
+      const csv = [headers.join(','), ...rows.map((row) => row.join(','))].join('\n');
+
+      // Set headers for file download
+      const filename = `audit-logs-${new Date().toISOString().split('T')[0]}.csv`;
+      reply.header('Content-Type', 'text/csv');
+      reply.header('Content-Disposition', `attachment; filename="${filename}"`);
+
+      // Warn if results were truncated
+      if (truncated) {
+        reply.header('X-Export-Truncated', 'true');
+        reply.header('X-Export-Limit', '5000');
+        logger.warn('Audit log export was truncated', { exportedCount: logs.length });
+      }
+
+      return reply.send(csv);
+    } catch (error) {
+      logger.error('Error exporting audit logs', { error });
+      return reply.code(500).send({
+        error: 'Internal Server Error',
+        message: 'Failed to export audit logs',
+      });
+    }
+  }
+}
--- a/backend/src/features/audit-log/api/audit-log.routes.ts
+++ b/backend/src/features/audit-log/api/audit-log.routes.ts
@@ -0,0 +1,50 @@
+/**
+ * @ai-summary Audit log feature routes
+ * @ai-context Registers audit log API endpoints with admin authorization
+ */
+
+import { FastifyPluginAsync } from 'fastify';
+import { AuditLogController } from './audit-log.controller';
+
+interface AuditLogsQuery {
+  search?: string;
+  category?: string;
+  severity?: string;
+  startDate?: string;
+  endDate?: string;
+  limit?: string;
+  offset?: string;
+}
+
+export const auditLogRoutes: FastifyPluginAsync = async (fastify) => {
+  const controller = new AuditLogController();
+
+  /**
+   * GET /api/admin/audit-logs
+   * Search audit logs with filters and pagination
+   *
+   * Query params:
+   * - search: Text search on action field
+   * - category: Filter by category (auth, vehicle, user, system, admin)
+   * - severity: Filter by severity (info, warning, error)
+   * - startDate: Filter by start date (ISO string)
+   * - endDate: Filter by end date (ISO string)
+   * - limit: Number of results (default 50, max 100)
+   * - offset: Pagination offset
+   */
+  fastify.get<{ Querystring: AuditLogsQuery }>('/admin/audit-logs', {
+    preHandler: [fastify.requireAdmin],
+    handler: controller.getAuditLogs.bind(controller),
+  });
+
+  /**
+   * GET /api/admin/audit-logs/export
+   * Export filtered audit logs as CSV file
+   *
+   * Query params: same as /admin/audit-logs
+   */
+  fastify.get<{ Querystring: AuditLogsQuery }>('/admin/audit-logs/export', {
+    preHandler: [fastify.requireAdmin],
+    handler: controller.exportAuditLogs.bind(controller),
+  });
+};
--- a/backend/src/features/audit-log/audit-log.instance.ts
+++ b/backend/src/features/audit-log/audit-log.instance.ts
@@ -0,0 +1,14 @@
+/**
+ * @ai-summary Singleton audit log service instance
+ * @ai-context Provides centralized audit logging across all features
+ */
+
+import { pool } from '../../core/config/database';
+import { AuditLogRepository } from './data/audit-log.repository';
+import { AuditLogService } from './domain/audit-log.service';
+
+// Create singleton repository and service instances
+const repository = new AuditLogRepository(pool);
+export const auditLogService = new AuditLogService(repository);
+
+export default auditLogService;
--- a/backend/src/features/audit-log/data/audit-log.repository.ts
+++ b/backend/src/features/audit-log/data/audit-log.repository.ts
@@ -0,0 +1,240 @@
+/**
+ * @ai-summary Audit log data access layer
+ * @ai-context Provides parameterized SQL queries for audit log operations
+ */
+
+import { Pool } from 'pg';
+import {
+  AuditLogEntry,
+  CreateAuditLogInput,
+  AuditLogFilters,
+  AuditLogPagination,
+  AuditLogSearchResult,
+} from '../domain/audit-log.types';
+import { logger } from '../../../core/logging/logger';
+
+// Maximum records for CSV export to prevent memory exhaustion
+const MAX_EXPORT_RECORDS = 5000;
+
+export class AuditLogRepository {
+  constructor(private pool: Pool) {}
+
+  /**
+   * Escape LIKE special characters to prevent pattern injection
+   */
+  private escapeLikePattern(pattern: string): string {
+    return pattern.replace(/[%_\\]/g, (match) => `\\${match}`);
+  }
+
+  /**
+   * Build WHERE clause from filters (shared logic for search and export)
+   */
+  private buildWhereClause(filters: AuditLogFilters): {
+    whereClause: string;
+    params: unknown[];
+    nextParamIndex: number;
+  } {
+    const conditions: string[] = [];
+    const params: unknown[] = [];
+    let paramIndex = 1;
+
+    if (filters.search) {
+      conditions.push(`al.action ILIKE $${paramIndex}`);
+      params.push(`%${this.escapeLikePattern(filters.search)}%`);
+      paramIndex++;
+    }
+
+    if (filters.category) {
+      conditions.push(`al.category = $${paramIndex}`);
+      params.push(filters.category);
+      paramIndex++;
+    }
+
+    if (filters.severity) {
+      conditions.push(`al.severity = $${paramIndex}`);
+      params.push(filters.severity);
+      paramIndex++;
+    }
+
+    if (filters.userId) {
+      conditions.push(`al.user_id = $${paramIndex}`);
+      params.push(filters.userId);
+      paramIndex++;
+    }
+
+    if (filters.startDate) {
+      conditions.push(`al.created_at >= $${paramIndex}`);
+      params.push(filters.startDate);
+      paramIndex++;
+    }
+
+    if (filters.endDate) {
+      conditions.push(`al.created_at <= $${paramIndex}`);
+      params.push(filters.endDate);
+      paramIndex++;
+    }
+
+    const whereClause = conditions.length > 0 ? `WHERE ${conditions.join(' AND ')}` : '';
+
+    return { whereClause, params, nextParamIndex: paramIndex };
+  }
+
+  /**
+   * Create a new audit log entry
+   */
+  async create(input: CreateAuditLogInput): Promise<AuditLogEntry> {
+    const query = `
+      INSERT INTO audit_logs (category, severity, user_id, action, resource_type, resource_id, details)
+      VALUES ($1, $2, $3, $4, $5, $6, $7)
+      RETURNING id, category, severity, user_id, action, resource_type, resource_id, details, created_at,
+                NULL::text as user_email
+    `;
+
+    try {
+      const result = await this.pool.query(query, [
+        input.category,
+        input.severity,
+        input.userId || null,
+        input.action,
+        input.resourceType || null,
+        input.resourceId || null,
+        input.details ? JSON.stringify(input.details) : null,
+      ]);
+
+      return this.mapRow(result.rows[0]);
+    } catch (error) {
+      logger.error('Error creating audit log', { error, input });
+      throw error;
+    }
+  }
+
+  /**
+   * Search audit logs with filters and pagination
+   */
+  async search(
+    filters: AuditLogFilters,
+    pagination: AuditLogPagination
+  ): Promise<AuditLogSearchResult> {
+    const { whereClause, params, nextParamIndex } = this.buildWhereClause(filters);
+
+    // Count query
+    const countQuery = `SELECT COUNT(*) as total FROM audit_logs al ${whereClause}`;
+
+    // Data query with pagination - LEFT JOIN to get user email
+    const dataQuery = `
+      SELECT al.id, al.category, al.severity, al.user_id, al.action,
+             al.resource_type, al.resource_id, al.details, al.created_at,
+             up.email as user_email
+      FROM audit_logs al
+      LEFT JOIN user_profiles up ON al.user_id = up.id
+      ${whereClause}
+      ORDER BY al.created_at DESC
+      LIMIT $${nextParamIndex} OFFSET $${nextParamIndex + 1}
+    `;
+
+    try {
+      const [countResult, dataResult] = await Promise.all([
+        this.pool.query(countQuery, params),
+        this.pool.query(dataQuery, [...params, pagination.limit, pagination.offset]),
+      ]);
+
+      const total = parseInt(countResult.rows[0].total, 10);
+      const logs = dataResult.rows.map((row) => this.mapRow(row));
+
+      return {
+        logs,
+        total,
+        limit: pagination.limit,
+        offset: pagination.offset,
+      };
+    } catch (error) {
+      logger.error('Error searching audit logs', { error, filters, pagination });
+      throw error;
+    }
+  }
+
+  /**
+   * Get all logs matching filters for CSV export (limited to prevent memory exhaustion)
+   */
+  async getForExport(filters: AuditLogFilters): Promise<{ logs: AuditLogEntry[]; truncated: boolean }> {
+    const { whereClause, params } = this.buildWhereClause(filters);
+
+    // First, count total matching records
+    const countQuery = `SELECT COUNT(*) as total FROM audit_logs al ${whereClause}`;
+    const countResult = await this.pool.query(countQuery, params);
+    const totalCount = parseInt(countResult.rows[0].total, 10);
+    const truncated = totalCount > MAX_EXPORT_RECORDS;
+
+    const query = `
+      SELECT al.id, al.category, al.severity, al.user_id, al.action,
+             al.resource_type, al.resource_id, al.details, al.created_at,
+             up.email as user_email
+      FROM audit_logs al
+      LEFT JOIN user_profiles up ON al.user_id = up.id
+      ${whereClause}
+      ORDER BY al.created_at DESC
+      LIMIT ${MAX_EXPORT_RECORDS}
+    `;
+
+    try {
+      const result = await this.pool.query(query, params);
+      const logs = result.rows.map((row) => this.mapRow(row));
+
+      if (truncated) {
+        logger.warn('Audit log export truncated', {
+          totalCount,
+          exportedCount: logs.length,
+          limit: MAX_EXPORT_RECORDS,
+        });
+      }
+
+      return { logs, truncated };
+    } catch (error) {
+      logger.error('Error exporting audit logs', { error, filters });
+      throw error;
+    }
+  }
+
+  /**
+   * Delete logs older than specified days (retention cleanup)
+   */
+  async cleanup(olderThanDays: number): Promise<number> {
+    const query = `
+      DELETE FROM audit_logs
+      WHERE created_at < NOW() - INTERVAL '1 day' * $1
+    `;
+
+    try {
+      const result = await this.pool.query(query, [olderThanDays]);
+      const deletedCount = result.rowCount || 0;
+
+      logger.info('Audit log cleanup completed', {
+        olderThanDays,
+        deletedCount,
+      });
+
+      return deletedCount;
+    } catch (error) {
+      logger.error('Error cleaning up audit logs', { error, olderThanDays });
+      throw error;
+    }
+  }
+
+  /**
+   * Map database row to AuditLogEntry (snake_case to camelCase)
+   */
+  private mapRow(row: Record<string, unknown>): AuditLogEntry {
+    return {
+      id: row.id as string,
+      category: row.category as AuditLogEntry['category'],
+      severity: row.severity as AuditLogEntry['severity'],
+      userId: row.user_id as string | null,
+      userEmail: (row.user_email as string | null) || null,
+      action: row.action as string,
+      resourceType: row.resource_type as string | null,
+      resourceId: row.resource_id as string | null,
+      details: row.details as Record<string, unknown> | null,
+      createdAt: new Date(row.created_at as string),
+    };
+  }
+}
--- a/backend/src/features/audit-log/domain/audit-log.service.ts
+++ b/backend/src/features/audit-log/domain/audit-log.service.ts
@@ -0,0 +1,163 @@
+/**
+ * @ai-summary Centralized audit logging service
+ * @ai-context Provides simple API for all features to log audit events
+ */
+
+import { AuditLogRepository } from '../data/audit-log.repository';
+import {
+  AuditLogCategory,
+  AuditLogSeverity,
+  AuditLogEntry,
+  AuditLogFilters,
+  AuditLogPagination,
+  AuditLogSearchResult,
+  isValidCategory,
+  isValidSeverity,
+} from './audit-log.types';
+import { logger } from '../../../core/logging/logger';
+
+export class AuditLogService {
+  constructor(private repository: AuditLogRepository) {}
+
+  /**
+   * Log an audit event
+   *
+   * @param category - Event category (auth, vehicle, user, system, admin)
+   * @param severity - Event severity (info, warning, error)
+   * @param userId - User who performed the action (null for system actions)
+   * @param action - Human-readable description of the action
+   * @param resourceType - Type of resource affected (optional)
+   * @param resourceId - ID of affected resource (optional)
+   * @param details - Additional structured data (optional)
+   */
+  async log(
+    category: AuditLogCategory,
+    severity: AuditLogSeverity,
+    userId: string | null,
+    action: string,
+    resourceType?: string | null,
+    resourceId?: string | null,
+    details?: Record<string, unknown> | null
+  ): Promise<AuditLogEntry> {
+    // Validate category
+    if (!isValidCategory(category)) {
+      const error = new Error(`Invalid audit log category: ${category}`);
+      logger.error('Invalid audit log category', { category });
+      throw error;
+    }
+
+    // Validate severity
+    if (!isValidSeverity(severity)) {
+      const error = new Error(`Invalid audit log severity: ${severity}`);
+      logger.error('Invalid audit log severity', { severity });
+      throw error;
+    }
+
+    try {
+      const entry = await this.repository.create({
+        category,
+        severity,
+        userId,
+        action,
+        resourceType,
+        resourceId,
+        details,
+      });
+
+      logger.debug('Audit log created', {
+        id: entry.id,
+        category,
+        severity,
+        action,
+      });
+
+      return entry;
+    } catch (error) {
+      logger.error('Error creating audit log', { error, category, action });
+      throw error;
+    }
+  }
+
+  /**
+   * Convenience method for info-level logs
+   */
+  async info(
+    category: AuditLogCategory,
+    userId: string | null,
+    action: string,
+    resourceType?: string | null,
+    resourceId?: string | null,
+    details?: Record<string, unknown> | null
+  ): Promise<AuditLogEntry> {
+    return this.log(category, 'info', userId, action, resourceType, resourceId, details);
+  }
+
+  /**
+   * Convenience method for warning-level logs
+   */
+  async warning(
+    category: AuditLogCategory,
+    userId: string | null,
+    action: string,
+    resourceType?: string | null,
+    resourceId?: string | null,
+    details?: Record<string, unknown> | null
+  ): Promise<AuditLogEntry> {
+    return this.log(category, 'warning', userId, action, resourceType, resourceId, details);
+  }
+
+  /**
+   * Convenience method for error-level logs
+   */
+  async error(
+    category: AuditLogCategory,
+    userId: string | null,
+    action: string,
+    resourceType?: string | null,
+    resourceId?: string | null,
+    details?: Record<string, unknown> | null
+  ): Promise<AuditLogEntry> {
+    return this.log(category, 'error', userId, action, resourceType, resourceId, details);
+  }
+
+  /**
+   * Search audit logs with filters and pagination
+   */
+  async search(
+    filters: AuditLogFilters,
+    pagination: AuditLogPagination
+  ): Promise<AuditLogSearchResult> {
+    try {
+      return await this.repository.search(filters, pagination);
+    } catch (error) {
+      logger.error('Error searching audit logs', { error, filters });
+      throw error;
+    }
+  }
+
+  /**
+   * Get logs for CSV export (limited to 5000 records)
+   */
+  async getForExport(filters: AuditLogFilters): Promise<{ logs: AuditLogEntry[]; truncated: boolean }> {
+    try {
+      return await this.repository.getForExport(filters);
+    } catch (error) {
+      logger.error('Error getting audit logs for export', { error, filters });
+      throw error;
+    }
+  }
+
+  /**
+   * Run retention cleanup (delete logs older than specified days)
+   */
+  async cleanup(olderThanDays: number = 90): Promise<number> {
+    try {
+      const deletedCount = await this.repository.cleanup(olderThanDays);
+      logger.info('Audit log cleanup completed', { olderThanDays, deletedCount });
+      return deletedCount;
+    } catch (error) {
+      logger.error('Error running audit log cleanup', { error, olderThanDays });
+      throw error;
+    }
+  }
+}
--- a/backend/src/features/audit-log/domain/audit-log.types.ts
+++ b/backend/src/features/audit-log/domain/audit-log.types.ts
@@ -0,0 +1,107 @@
+/**
+ * @ai-summary Type definitions for centralized audit logging
+ * @ai-context Categories, severity levels, log entries, and filter options
+ */
+
+/**
+ * Audit log categories - maps to system domains
+ */
+export type AuditLogCategory = 'auth' | 'vehicle' | 'user' | 'system' | 'admin';
+
+/**
+ * Audit log severity levels
+ */
+export type AuditLogSeverity = 'info' | 'warning' | 'error';
+
+/**
+ * Audit log entry as stored in database
+ */
+export interface AuditLogEntry {
+  id: string;
+  category: AuditLogCategory;
+  severity: AuditLogSeverity;
+  userId: string | null;
+  userEmail: string | null;
+  action: string;
+  resourceType: string | null;
+  resourceId: string | null;
+  details: Record<string, unknown> | null;
+  createdAt: Date;
+}
+
+/**
+ * Input for creating a new audit log entry
+ */
+export interface CreateAuditLogInput {
+  category: AuditLogCategory;
+  severity: AuditLogSeverity;
+  userId?: string | null;
+  action: string;
+  resourceType?: string | null;
+  resourceId?: string | null;
+  details?: Record<string, unknown> | null;
+}
+
+/**
+ * Filters for querying audit logs
+ */
+export interface AuditLogFilters {
+  search?: string;
+  category?: AuditLogCategory;
+  severity?: AuditLogSeverity;
+  userId?: string;
+  startDate?: Date;
+  endDate?: Date;
+}
+
+/**
+ * Pagination options for audit log queries
+ */
+export interface AuditLogPagination {
+  limit: number;
+  offset: number;
+}
+
+/**
+ * Paginated result set for audit logs
+ */
+export interface AuditLogSearchResult {
+  logs: AuditLogEntry[];
+  total: number;
+  limit: number;
+  offset: number;
+}
+
+/**
+ * Valid category values for validation
+ */
+export const AUDIT_LOG_CATEGORIES: readonly AuditLogCategory[] = [
+  'auth',
+  'vehicle',
+  'user',
+  'system',
+  'admin',
+] as const;
+
+/**
+ * Valid severity values for validation
+ */
+export const AUDIT_LOG_SEVERITIES: readonly AuditLogSeverity[] = [
+  'info',
+  'warning',
+  'error',
+] as const;
+
+/**
+ * Type guard for category validation
+ */
+export function isValidCategory(value: string): value is AuditLogCategory {
+  return AUDIT_LOG_CATEGORIES.includes(value as AuditLogCategory);
+}
+
+/**
+ * Type guard for severity validation
+ */
+export function isValidSeverity(value: string): value is AuditLogSeverity {
+  return AUDIT_LOG_SEVERITIES.includes(value as AuditLogSeverity);
+}
--- a/backend/src/features/audit-log/index.ts
+++ b/backend/src/features/audit-log/index.ts
@@ -0,0 +1,28 @@
+/**
+ * @ai-summary Audit log feature exports
+ * @ai-context Re-exports types, service, and repository for external use
+ */
+
+// Types
+export {
+  AuditLogCategory,
+  AuditLogSeverity,
+  AuditLogEntry,
+  CreateAuditLogInput,
+  AuditLogFilters,
+  AuditLogPagination,
+  AuditLogSearchResult,
+  AUDIT_LOG_CATEGORIES,
+  AUDIT_LOG_SEVERITIES,
+  isValidCategory,
+  isValidSeverity,
+} from './domain/audit-log.types';
+
+// Service
+export { AuditLogService } from './domain/audit-log.service';
+
+// Repository
+export { AuditLogRepository } from './data/audit-log.repository';
+
+// Singleton instance for cross-feature use
+export { auditLogService } from './audit-log.instance';
--- a/backend/src/features/audit-log/jobs/cleanup.job.ts
+++ b/backend/src/features/audit-log/jobs/cleanup.job.ts
@@ -0,0 +1,74 @@
+/**
+ * @ai-summary Job for audit log retention cleanup
+ * @ai-context Runs daily at 3 AM to delete logs older than 90 days
+ */
+
+import { Pool } from 'pg';
+import { logger } from '../../../core/logging/logger';
+import { AuditLogService } from '../domain/audit-log.service';
+import { AuditLogRepository } from '../data/audit-log.repository';
+
+let pool: Pool | null = null;
+
+/**
+ * Sets the database pool for the job
+ */
+export function setAuditLogCleanupJobPool(dbPool: Pool): void {
+  pool = dbPool;
+}
+
+/**
+ * Retention period in days for audit logs
+ */
+const AUDIT_LOG_RETENTION_DAYS = 90;
+
+/**
+ * Result of cleanup job
+ */
+export interface AuditLogCleanupResult {
+  deletedCount: number;
+  retentionDays: number;
+  success: boolean;
+  error?: string;
+}
+
+/**
+ * Processes audit log retention cleanup
+ */
+export async function processAuditLogCleanup(): Promise<AuditLogCleanupResult> {
+  if (!pool) {
+    throw new Error('Database pool not initialized for audit log cleanup job');
+  }
+
+  const repository = new AuditLogRepository(pool);
+  const service = new AuditLogService(repository);
+
+  try {
+    logger.info('Starting audit log cleanup job', {
+      retentionDays: AUDIT_LOG_RETENTION_DAYS,
+    });
+
+    const deletedCount = await service.cleanup(AUDIT_LOG_RETENTION_DAYS);
+
+    logger.info('Audit log cleanup job completed', {
+      deletedCount,
+      retentionDays: AUDIT_LOG_RETENTION_DAYS,
+    });
+
+    return {
+      deletedCount,
+      retentionDays: AUDIT_LOG_RETENTION_DAYS,
+      success: true,
+    };
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : String(error);
+    logger.error('Audit log cleanup job failed', { error: errorMessage });
+
+    return {
+      deletedCount: 0,
+      retentionDays: AUDIT_LOG_RETENTION_DAYS,
+      success: false,
+      error: errorMessage,
+    };
+  }
+}
--- a/backend/src/features/audit-log/migrations/001_create_audit_logs.sql
+++ b/backend/src/features/audit-log/migrations/001_create_audit_logs.sql
@@ -0,0 +1,35 @@
+-- Migration: Create audit_logs table for centralized audit logging
+-- Categories: auth, vehicle, user, system, admin
+-- Severity levels: info, warning, error
+
+CREATE TABLE IF NOT EXISTS audit_logs (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  category VARCHAR(20) NOT NULL CHECK (category IN ('auth', 'vehicle', 'user', 'system', 'admin')),
+  severity VARCHAR(10) NOT NULL CHECK (severity IN ('info', 'warning', 'error')),
+  user_id VARCHAR(255),
+  action VARCHAR(500) NOT NULL,
+  resource_type VARCHAR(100),
+  resource_id VARCHAR(255),
+  details JSONB,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+-- B-tree indexes for filtered queries
+CREATE INDEX idx_audit_logs_category_created ON audit_logs(category, created_at DESC);
+CREATE INDEX idx_audit_logs_severity_created ON audit_logs(severity, created_at DESC);
+CREATE INDEX idx_audit_logs_user_created ON audit_logs(user_id, created_at DESC);
+CREATE INDEX idx_audit_logs_created ON audit_logs(created_at DESC);
+
+-- GIN index for text search on action column (requires pg_trgm extension)
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+CREATE INDEX idx_audit_logs_action_gin ON audit_logs USING gin (action gin_trgm_ops);
+
+-- Comment for documentation
+COMMENT ON TABLE audit_logs IS 'Centralized audit log for all system events across categories';
+COMMENT ON COLUMN audit_logs.category IS 'Event category: auth, vehicle, user, system, admin';
+COMMENT ON COLUMN audit_logs.severity IS 'Event severity: info, warning, error';
+COMMENT ON COLUMN audit_logs.user_id IS 'User who performed the action (null for system actions)';
+COMMENT ON COLUMN audit_logs.action IS 'Human-readable description of the action';
+COMMENT ON COLUMN audit_logs.resource_type IS 'Type of resource affected (e.g., vehicle, backup)';
+COMMENT ON COLUMN audit_logs.resource_id IS 'ID of the affected resource';
+COMMENT ON COLUMN audit_logs.details IS 'Additional structured data about the event';
--- a/backend/src/features/auth/CLAUDE.md
+++ b/backend/src/features/auth/CLAUDE.md
@@ -0,0 +1,16 @@
+# auth/
+
+## Files
+
+| File | What | When to read |
+| ---- | ---- | ------------ |
+| `README.md` | Feature documentation | Understanding auth flow |
+| `index.ts` | Feature barrel export | Importing auth services |
+
+## Subdirectories
+
+| Directory | What | When to read |
+| --------- | ---- | ------------ |
+| `api/` | HTTP endpoints and routes | API changes |
+| `domain/` | Business logic, services, types | Core auth logic |
+| `tests/` | Unit and integration tests | Adding or modifying tests |
--- a/backend/src/features/auth/api/auth.controller.ts
+++ b/backend/src/features/auth/api/auth.controller.ts
@@ -11,6 +11,7 @@ import { termsConfig } from '../../terms-agreement/domain/terms-config';
 import { pool } from '../../../core/config/database';
 import { logger } from '../../../core/logging/logger';
 import { signupSchema, resendVerificationPublicSchema } from './auth.validation';
+import { auditLogService } from '../../audit-log';

 export class AuthController {
  private authService: AuthService;
@@ -66,6 +67,16 @@ export class AuthController {

      logger.info('User signup successful', { email, userId: result.userId });

+      // Log signup to unified audit log
+      await auditLogService.info(
+        'auth',
+        result.userId,
+        `User signup: ${email}`,
+        'user',
+        result.userId,
+        { email, ipAddress: termsData.ipAddress }
+      ).catch(err => logger.error('Failed to log signup audit event', { error: err }));
+
      return reply.code(201).send(result);
    } catch (error: any) {
      logger.error('Signup failed', { error, email: (request.body as any)?.email });
@@ -99,17 +110,17 @@ export class AuthController {
   */
  async getVerifyStatus(request: FastifyRequest, reply: FastifyReply) {
    try {
-      const userId = (request as any).user.sub;
+      const auth0Sub = (request as any).user.sub;

-      const result = await this.authService.getVerifyStatus(userId);
+      const result = await this.authService.getVerifyStatus(auth0Sub);

-      logger.info('Verification status checked', { userId, emailVerified: result.emailVerified });
+      logger.info('Verification status checked', { userId: request.userContext?.userId, emailVerified: result.emailVerified });

      return reply.code(200).send(result);
    } catch (error: any) {
      logger.error('Failed to get verification status', {
        error,
-        userId: (request as any).user?.sub,
+        userId: request.userContext?.userId,
      });

      return reply.code(500).send({
@@ -126,17 +137,17 @@ export class AuthController {
   */
  async resendVerification(request: FastifyRequest, reply: FastifyReply) {
    try {
-      const userId = (request as any).user.sub;
+      const auth0Sub = (request as any).user.sub;

-      const result = await this.authService.resendVerification(userId);
+      const result = await this.authService.resendVerification(auth0Sub);

-      logger.info('Verification email resent', { userId });
+      logger.info('Verification email resent', { userId: request.userContext?.userId });

      return reply.code(200).send(result);
    } catch (error: any) {
      logger.error('Failed to resend verification email', {
        error,
-        userId: (request as any).user?.sub,
+        userId: request.userContext?.userId,
      });

      return reply.code(500).send({
@@ -182,15 +193,32 @@ export class AuthController {
   * GET /api/auth/user-status
   * Get user status for routing decisions
   * Protected endpoint - requires JWT
+   *
+   * Note: This endpoint is called once per Auth0 callback (from CallbackPage/CallbackMobileScreen).
+   * We log the login event here since it's the first authenticated request after Auth0 redirect.
   */
  async getUserStatus(request: FastifyRequest, reply: FastifyReply) {
    try {
-      const userId = (request as any).user.sub;
+      const auth0Sub = (request as any).user.sub;
+      const userId = request.userContext?.userId;

-      const result = await this.authService.getUserStatus(userId);
+      const result = await this.authService.getUserStatus(auth0Sub);
+
+      // Log login event to audit trail (called once per Auth0 callback)
+      const ipAddress = this.getClientIp(request);
+      if (userId) {
+        await auditLogService.info(
+          'auth',
+          userId,
+          'User login',
+          'user',
+          userId,
+          { ipAddress }
+        ).catch(err => logger.error('Failed to log login audit event', { error: err }));
+      }

      logger.info('User status retrieved', {
-        userId: userId.substring(0, 8) + '...',
+        userId: userId?.substring(0, 8) + '...',
        emailVerified: result.emailVerified,
        onboardingCompleted: result.onboardingCompleted,
      });
@@ -199,7 +227,7 @@ export class AuthController {
    } catch (error: any) {
      logger.error('Failed to get user status', {
        error,
-        userId: (request as any).user?.sub,
+        userId: request.userContext?.userId,
      });

      return reply.code(500).send({
@@ -216,12 +244,12 @@ export class AuthController {
   */
  async getSecurityStatus(request: FastifyRequest, reply: FastifyReply) {
    try {
-      const userId = (request as any).user.sub;
+      const auth0Sub = (request as any).user.sub;

-      const result = await this.authService.getSecurityStatus(userId);
+      const result = await this.authService.getSecurityStatus(auth0Sub);

      logger.info('Security status retrieved', {
-        userId: userId.substring(0, 8) + '...',
+        userId: request.userContext?.userId,
        emailVerified: result.emailVerified,
      });

@@ -229,7 +257,7 @@ export class AuthController {
    } catch (error: any) {
      logger.error('Failed to get security status', {
        error,
-        userId: (request as any).user?.sub,
+        userId: request.userContext?.userId,
      });

      return reply.code(500).send({
@@ -246,19 +274,31 @@ export class AuthController {
   */
  async requestPasswordReset(request: FastifyRequest, reply: FastifyReply) {
    try {
-      const userId = (request as any).user.sub;
+      const auth0Sub = (request as any).user.sub;
+      const userId = request.userContext?.userId;

-      const result = await this.authService.requestPasswordReset(userId);
+      const result = await this.authService.requestPasswordReset(auth0Sub);

      logger.info('Password reset email requested', {
-        userId: userId.substring(0, 8) + '...',
+        userId: userId?.substring(0, 8) + '...',
      });

+      // Log password reset request to unified audit log
+      if (userId) {
+        await auditLogService.info(
+          'auth',
+          userId,
+          'Password reset requested',
+          'user',
+          userId
+        ).catch(err => logger.error('Failed to log password reset audit event', { error: err }));
+      }
+
      return reply.code(200).send(result);
    } catch (error: any) {
      logger.error('Failed to request password reset', {
        error,
-        userId: (request as any).user?.sub,
+        userId: request.userContext?.userId,
      });

      return reply.code(500).send({
@@ -267,4 +307,45 @@ export class AuthController {
      });
    }
  }
+
+  /**
+   * POST /api/auth/track-logout
+   * Track user logout event for audit logging
+   * Protected endpoint - requires JWT
+   *
+   * Called by frontend before Auth0 logout to capture the logout event.
+   * Returns success even if audit logging fails (non-blocking).
+   */
+  async trackLogout(request: FastifyRequest, reply: FastifyReply) {
+    try {
+      const userId = request.userContext?.userId;
+      const ipAddress = this.getClientIp(request);
+
+      // Log logout event to audit trail
+      if (userId) {
+        await auditLogService.info(
+          'auth',
+          userId,
+          'User logout',
+          'user',
+          userId,
+          { ipAddress }
+        ).catch(err => logger.error('Failed to log logout audit event', { error: err }));
+      }
+
+      logger.info('User logout tracked', {
+        userId: userId?.substring(0, 8) + '...',
+      });
+
+      return reply.code(200).send({ success: true });
+    } catch (error: any) {
+      // Don't block logout on audit failure - always return success
+      logger.error('Failed to track logout', {
+        error,
+        userId: request.userContext?.userId,
+      });
+
+      return reply.code(200).send({ success: true });
+    }
+  }
 }
--- a/backend/src/features/auth/api/auth.routes.ts
+++ b/backend/src/features/auth/api/auth.routes.ts
@@ -48,4 +48,10 @@ export const authRoutes: FastifyPluginAsync = async (
    preHandler: [fastify.authenticate],
    handler: authController.requestPasswordReset.bind(authController),
  });
+
+  // POST /api/auth/track-logout - Track logout event for audit (requires JWT)
+  fastify.post('/auth/track-logout', {
+    preHandler: [fastify.authenticate],
+    handler: authController.trackLogout.bind(authController),
+  });
 };
--- a/backend/src/features/auth/tests/integration/auth.integration.test.ts
+++ b/backend/src/features/auth/tests/integration/auth.integration.test.ts
@@ -19,6 +19,7 @@ jest.mock('../../../../core/plugins/auth.plugin', () => {
  return {
    default: fastifyPlugin(async function (fastify) {
      fastify.decorate('authenticate', async function (request, _reply) {
+        // JWT sub is still auth0|xxx format
        request.user = { sub: 'auth0|test-user-123' };
      });
    }, { name: 'auth-plugin' }),
--- a/backend/src/features/auth/tests/unit/auth.service.test.ts
+++ b/backend/src/features/auth/tests/unit/auth.service.test.ts
@@ -103,6 +103,8 @@ describe('AuthService', () => {
        onboardingCompletedAt: null,
        deactivatedAt: null,
        deactivatedBy: null,
+        deletionRequestedAt: null,
+        deletionScheduledFor: null,
        createdAt: new Date(),
        updatedAt: new Date(),
      });
@@ -116,6 +118,8 @@ describe('AuthService', () => {
        onboardingCompletedAt: null,
        deactivatedAt: null,
        deactivatedBy: null,
+        deletionRequestedAt: null,
+        deletionScheduledFor: null,
        createdAt: new Date(),
        updatedAt: new Date(),
      });
@@ -149,6 +153,8 @@ describe('AuthService', () => {
        onboardingCompletedAt: null,
        deactivatedAt: null,
        deactivatedBy: null,
+        deletionRequestedAt: null,
+        deletionScheduledFor: null,
        createdAt: new Date(),
        updatedAt: new Date(),
      });
--- a/backend/src/features/backup/CLAUDE.md
+++ b/backend/src/features/backup/CLAUDE.md
@@ -0,0 +1,18 @@
+# backup/
+
+## Files
+
+| File | What | When to read |
+| ---- | ---- | ------------ |
+| `README.md` | Feature documentation | Understanding backup architecture |
+
+## Subdirectories
+
+| Directory | What | When to read |
+| --------- | ---- | ------------ |
+| `api/` | HTTP endpoints, validation | API changes |
+| `domain/` | Business logic, services | Core backup/retention logic |
+| `data/` | Repository, database queries | Database operations |
+| `jobs/` | Scheduled job handlers | Cron job modifications |
+| `migrations/` | Database schema | Schema changes |
+| `tests/` | Unit and integration tests | Adding or modifying tests |
--- a/backend/src/features/backup/README.md
+++ b/backend/src/features/backup/README.md
@@ -19,11 +19,12 @@ backup/
    backup.controller.ts  # Request handlers
    backup.validation.ts  # Zod schemas
  domain/                 # Business logic
-    backup.types.ts       # TypeScript types
+    backup.types.ts       # TypeScript types and constants
    backup.service.ts     # Core backup operations
-    backup-archive.service.ts    # Archive creation
-    backup-restore.service.ts    # Restore operations
-    backup-retention.service.ts  # Retention enforcement
+    backup-archive.service.ts      # Archive creation
+    backup-restore.service.ts      # Restore operations
+    backup-retention.service.ts    # Tiered retention enforcement
+    backup-classification.service.ts  # Backup category classification
  data/                   # Data access
    backup.repository.ts  # Database queries
  jobs/                   # Scheduled jobs
@@ -31,6 +32,10 @@ backup/
    backup-cleanup.job.ts    # Retention cleanup
  migrations/             # Database schema
    001_create_backup_tables.sql
+    002_add_retention_categories.sql  # Tiered retention columns
+  tests/                  # Test files
+    unit/
+      backup-classification.service.test.ts  # Classification tests
 ```

 ## API Endpoints
@@ -122,11 +127,45 @@ Scheduled backups use Redis distributed locking to prevent duplicate backups whe
 - Lock TTL: 5 minutes (auto-release if container crashes)
 - Only one container creates the backup; others skip

-**Retention cleanup:**
+**Retention cleanup (tiered):**
 - Runs immediately after each successful scheduled backup
- Deletes backups exceeding the schedule's retention count
+- Uses tiered classification: each backup can belong to multiple categories
+- A backup is only deleted when it exceeds ALL applicable category quotas
 - Also runs globally at 4 AM daily as a safety net

+## Tiered Retention System
+
+Backups are classified by their creation timestamp into categories:
+
+| Category | Qualification | Retention Count |
+|----------|--------------|-----------------|
+| hourly | All backups | 8 |
+| daily | First backup at midnight UTC | 7 |
+| weekly | First backup on Sunday at midnight UTC | 4 |
+| monthly | First backup on 1st of month at midnight UTC | 12 |
+
+**Multi-category classification:**
+- A backup can belong to multiple categories simultaneously
+- Example: Backup at midnight on Sunday, January 1st qualifies as: hourly + daily + weekly + monthly
+
+**Retention logic:**
+```
+For each category (hourly, daily, weekly, monthly):
+  1. Get all backups with this category
+  2. Keep top N (sorted by started_at DESC)
+  3. Add to protected set
+
+A backup is deleted ONLY if it's NOT in the protected set
+(i.e., exceeds quota for ALL its categories)
+```
+
+**Expiration calculation:**
+- Each backup's `expires_at` is calculated based on its longest retention period
+- Monthly backup: 12 months from creation
+- Weekly-only backup: 4 weeks from creation
+- Daily-only backup: 7 days from creation
+- Hourly-only backup: 8 hours from creation
+
 See `backend/src/core/scheduler/README.md` for the distributed locking pattern.

 ### Admin Routes
--- a/backend/src/features/backup/api/backup.controller.ts
+++ b/backend/src/features/backup/api/backup.controller.ts
@@ -18,6 +18,7 @@ import {
  ScheduleIdParam,
  UpdateSettingsBody,
 } from './backup.validation';
+import { auditLogService } from '../../audit-log';

 export class BackupController {
  private backupService: BackupService;
@@ -44,22 +45,42 @@ export class BackupController {
    request: FastifyRequest<{ Body: CreateBackupBody }>,
    reply: FastifyReply
  ): Promise<void> {
-    const adminSub = (request as any).userContext?.auth0Sub;
+    const adminUserId = request.userContext?.userId;

    const result = await this.backupService.createBackup({
      name: request.body.name,
      backupType: 'manual',
-      createdBy: adminSub,
+      createdBy: adminUserId,
      includeDocuments: request.body.includeDocuments,
    });

    if (result.success) {
+      // Log backup creation to unified audit log
+      await auditLogService.info(
+        'system',
+        adminUserId || null,
+        `Backup created: ${request.body.name || 'Manual backup'}`,
+        'backup',
+        result.backupId,
+        { name: request.body.name, includeDocuments: request.body.includeDocuments }
+      ).catch(err => logger.error('Failed to log backup create audit event', { error: err }));
+
      reply.status(201).send({
        backupId: result.backupId,
        status: 'completed',
        message: 'Backup created successfully',
      });
    } else {
+      // Log backup failure
+      await auditLogService.error(
+        'system',
+        adminUserId || null,
+        `Backup failed: ${request.body.name || 'Manual backup'}`,
+        'backup',
+        result.backupId,
+        { error: result.error }
+      ).catch(err => logger.error('Failed to log backup failure audit event', { error: err }));
+
      reply.status(500).send({
        backupId: result.backupId,
        status: 'failed',
@@ -118,7 +139,7 @@ export class BackupController {
    request: FastifyRequest,
    reply: FastifyReply
  ): Promise<void> {
-    const adminSub = (request as any).userContext?.auth0Sub;
+    const adminUserId = request.userContext?.userId;

    // Handle multipart file upload
    const data = await request.file();
@@ -152,7 +173,7 @@ export class BackupController {
      const backup = await this.backupService.importUploadedBackup(
        tempPath,
        filename,
-        adminSub
+        adminUserId
      );

      reply.status(201).send({
@@ -196,6 +217,8 @@ export class BackupController {
    request: FastifyRequest<{ Params: BackupIdParam; Body: RestoreBody }>,
    reply: FastifyReply
  ): Promise<void> {
+    const adminUserId = request.userContext?.userId;
+
    try {
      const result = await this.restoreService.executeRestore({
        backupId: request.params.id,
@@ -203,6 +226,16 @@ export class BackupController {
      });

      if (result.success) {
+        // Log successful restore to unified audit log
+        await auditLogService.info(
+          'system',
+          adminUserId || null,
+          `Backup restored: ${request.params.id}`,
+          'backup',
+          request.params.id,
+          { safetyBackupId: result.safetyBackupId }
+        ).catch(err => logger.error('Failed to log restore success audit event', { error: err }));
+
        reply.send({
          success: true,
          safetyBackupId: result.safetyBackupId,
@@ -210,6 +243,16 @@ export class BackupController {
          message: 'Restore completed successfully',
        });
      } else {
+        // Log restore failure
+        await auditLogService.error(
+          'system',
+          adminUserId || null,
+          `Backup restore failed: ${request.params.id}`,
+          'backup',
+          request.params.id,
+          { error: result.error, safetyBackupId: result.safetyBackupId }
+        ).catch(err => logger.error('Failed to log restore failure audit event', { error: err }));
+
        reply.status(500).send({
          success: false,
          safetyBackupId: result.safetyBackupId,
--- a/backend/src/features/backup/data/backup.repository.ts
+++ b/backend/src/features/backup/data/backup.repository.ts
@@ -12,6 +12,7 @@ import {
  BackupType,
  BackupStatus,
  BackupMetadata,
+  BackupCategory,
  ListBackupsParams,
  CRON_EXPRESSIONS,
 } from '../domain/backup.types';
@@ -54,6 +55,8 @@ export class BackupRepository {
      completedAt: row.completed_at ? new Date(row.completed_at) : null,
      createdBy: row.created_by,
      metadata: row.metadata as BackupMetadata,
+      categories: (row.categories || ['hourly']) as BackupCategory[],
+      expiresAt: row.expires_at ? new Date(row.expires_at) : null,
    };
  }

@@ -261,11 +264,13 @@ export class BackupRepository {
    fileSizeBytes: number;
    createdBy?: string | null;
    metadata?: BackupMetadata;
+    categories?: BackupCategory[];
+    expiresAt?: Date | null;
  }): Promise<BackupHistory> {
    const result = await this.pool.query(
      `INSERT INTO backup_history
-       (schedule_id, backup_type, filename, file_path, file_size_bytes, status, created_by, metadata)
-       VALUES ($1, $2, $3, $4, $5, 'in_progress', $6, $7)
+       (schedule_id, backup_type, filename, file_path, file_size_bytes, status, created_by, metadata, categories, expires_at)
+       VALUES ($1, $2, $3, $4, $5, 'in_progress', $6, $7, $8, $9)
       RETURNING *`,
      [
        data.scheduleId || null,
@@ -275,6 +280,8 @@ export class BackupRepository {
        data.fileSizeBytes,
        data.createdBy || null,
        JSON.stringify(data.metadata || {}),
+        data.categories || ['hourly'],
+        data.expiresAt || null,
      ]
    );
    return this.mapHistoryRow(result.rows[0]);
@@ -351,6 +358,38 @@ export class BackupRepository {
    return result.rows.map(this.mapHistoryRow);
  }

+  // ============================================
+  // Tiered Retention Operations
+  // ============================================
+
+  /**
+   * Gets all completed backups that have a specific category.
+   * Sorted by started_at DESC (newest first).
+   */
+  async getBackupsByCategory(category: BackupCategory): Promise<BackupHistory[]> {
+    const result = await this.pool.query(
+      `SELECT * FROM backup_history
+       WHERE status = 'completed'
+       AND $1 = ANY(categories)
+       ORDER BY started_at DESC`,
+      [category]
+    );
+    return result.rows.map(row => this.mapHistoryRow(row));
+  }
+
+  /**
+   * Gets all completed backups for tiered retention processing.
+   * Returns backups sorted by started_at DESC.
+   */
+  async getAllCompletedBackups(): Promise<BackupHistory[]> {
+    const result = await this.pool.query(
+      `SELECT * FROM backup_history
+       WHERE status = 'completed'
+       ORDER BY started_at DESC`
+    );
+    return result.rows.map(row => this.mapHistoryRow(row));
+  }
+
  // ============================================
  // Settings Operations
  // ============================================
--- a/backend/src/features/backup/domain/backup-classification.service.ts
+++ b/backend/src/features/backup/domain/backup-classification.service.ts
@@ -0,0 +1,106 @@
+/**
+ * @ai-summary Service for classifying backups into tiered retention categories
+ * @ai-context Pure functions for timestamp-based classification, no database dependencies
+ */
+
+import { BackupCategory, TIERED_RETENTION } from './backup.types';
+
+/**
+ * Classifies a backup by its timestamp into retention categories.
+ * A backup can belong to multiple categories simultaneously.
+ *
+ * Categories:
+ * - hourly: All backups
+ * - daily: First backup at midnight UTC (hour = 0)
+ * - weekly: First backup on Sunday at midnight UTC
+ * - monthly: First backup on 1st of month at midnight UTC
+ */
+export function classifyBackup(timestamp: Date): BackupCategory[] {
+  const categories: BackupCategory[] = ['hourly'];
+
+  const utcHour = timestamp.getUTCHours();
+  const utcDay = timestamp.getUTCDate();
+  const utcDayOfWeek = timestamp.getUTCDay(); // 0 = Sunday
+
+  // Midnight UTC qualifies for daily
+  if (utcHour === 0) {
+    categories.push('daily');
+
+    // Sunday at midnight qualifies for weekly
+    if (utcDayOfWeek === 0) {
+      categories.push('weekly');
+    }
+
+    // 1st of month at midnight qualifies for monthly
+    if (utcDay === 1) {
+      categories.push('monthly');
+    }
+  }
+
+  return categories;
+}
+
+/**
+ * Calculates the expiration date based on the backup's categories.
+ * Uses the longest retention period among all applicable categories.
+ *
+ * Retention periods are count-based in the actual cleanup, but for display
+ * we estimate based on typical backup frequency:
+ * - hourly: 8 hours (8 backups * 1 hour)
+ * - daily: 7 days (7 backups * 1 day)
+ * - weekly: 4 weeks (4 backups * 1 week)
+ * - monthly: 12 months (12 backups * 1 month)
+ */
+export function calculateExpiration(
+  categories: BackupCategory[],
+  timestamp: Date
+): Date {
+  const expirationDate = new Date(timestamp);
+
+  if (categories.includes('monthly')) {
+    expirationDate.setUTCMonth(expirationDate.getUTCMonth() + TIERED_RETENTION.monthly);
+  } else if (categories.includes('weekly')) {
+    expirationDate.setUTCDate(expirationDate.getUTCDate() + TIERED_RETENTION.weekly * 7);
+  } else if (categories.includes('daily')) {
+    expirationDate.setUTCDate(expirationDate.getUTCDate() + TIERED_RETENTION.daily);
+  } else {
+    // Hourly only - 8 hours
+    expirationDate.setUTCHours(expirationDate.getUTCHours() + TIERED_RETENTION.hourly);
+  }
+
+  return expirationDate;
+}
+
+/**
+ * Checks if a backup timestamp represents the first backup of the day (midnight UTC).
+ */
+export function isFirstBackupOfDay(timestamp: Date): boolean {
+  return timestamp.getUTCHours() === 0;
+}
+
+/**
+ * Checks if a timestamp falls on a Sunday.
+ */
+export function isSunday(timestamp: Date): boolean {
+  return timestamp.getUTCDay() === 0;
+}
+
+/**
+ * Checks if a timestamp falls on the first day of the month.
+ */
+export function isFirstDayOfMonth(timestamp: Date): boolean {
+  return timestamp.getUTCDate() === 1;
+}
+
+/**
+ * Classifies a backup and calculates its expiration in one call.
+ * Convenience function for backup creation flow.
+ */
+export function classifyAndCalculateExpiration(timestamp: Date): {
+  categories: BackupCategory[];
+  expiresAt: Date;
+} {
+  const categories = classifyBackup(timestamp);
+  const expiresAt = calculateExpiration(categories, timestamp);
+  return { categories, expiresAt };
+}
--- a/backend/src/features/backup/domain/backup-retention.service.ts
+++ b/backend/src/features/backup/domain/backup-retention.service.ts
@@ -10,6 +10,9 @@ import { BackupRepository } from '../data/backup.repository';
 import {
  RetentionCleanupResult,
  RetentionCleanupJobResult,
+  BackupCategory,
+  BackupHistory,
+  TIERED_RETENTION,
 } from './backup.types';

 export class BackupRetentionService {
@@ -20,61 +23,47 @@ export class BackupRetentionService {
  }

  /**
-   * Processes retention cleanup for all schedules
+   * Processes retention cleanup using tiered classification.
+   * A backup can only be deleted if it exceeds the quota for ALL of its categories.
   */
  async processRetentionCleanup(): Promise<RetentionCleanupJobResult> {
-    logger.info('Starting backup retention cleanup');
+    logger.info('Starting tiered backup retention cleanup');

-    const schedules = await this.repository.listSchedules();
    const results: RetentionCleanupResult[] = [];
    const errors: Array<{ scheduleId: string; error: string }> = [];
    let totalDeleted = 0;
    let totalFreedBytes = 0;

-    for (const schedule of schedules) {
-      try {
-        const result = await this.cleanupScheduleBackups(
-          schedule.id,
-          schedule.name,
-          schedule.retentionCount
-        );
-        results.push(result);
-        totalDeleted += result.deletedCount;
-        totalFreedBytes += result.freedBytes;
-      } catch (error) {
-        const errorMessage = error instanceof Error ? error.message : String(error);
-        logger.error('Retention cleanup failed for schedule', {
-          scheduleId: schedule.id,
-          scheduleName: schedule.name,
-          error: errorMessage,
-        });
-        errors.push({ scheduleId: schedule.id, error: errorMessage });
-      }
+    try {
+      const result = await this.processTieredRetentionCleanup();
+      results.push(result);
+      totalDeleted = result.deletedCount;
+      totalFreedBytes = result.freedBytes;
+    } catch (error) {
+      const errorMessage = error instanceof Error ? error.message : String(error);
+      logger.error('Tiered retention cleanup failed', { error: errorMessage });
+      errors.push({ scheduleId: 'tiered', error: errorMessage });
    }

-    // Also cleanup orphaned backups (from deleted schedules)
+    // Also cleanup failed backups older than 24 hours
    try {
-      const orphanResult = await this.cleanupOrphanedBackups();
-      if (orphanResult.deletedCount > 0) {
-        results.push(orphanResult);
-        totalDeleted += orphanResult.deletedCount;
-        totalFreedBytes += orphanResult.freedBytes;
+      const failedCount = await this.cleanupFailedBackups();
+      if (failedCount > 0) {
+        logger.info('Cleaned up failed backups', { count: failedCount });
      }
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : String(error);
-      logger.error('Orphaned backup cleanup failed', { error: errorMessage });
-      errors.push({ scheduleId: 'orphaned', error: errorMessage });
+      logger.error('Failed backup cleanup failed', { error: errorMessage });
    }

    logger.info('Backup retention cleanup completed', {
-      processed: schedules.length,
      totalDeleted,
      totalFreedBytes,
      errors: errors.length,
    });

    return {
-      processed: schedules.length,
+      processed: 1, // Single tiered process
      totalDeleted,
      totalFreedBytes,
      results,
@@ -82,6 +71,140 @@ export class BackupRetentionService {
    };
  }

+  /**
+   * Implements tiered retention: keeps N backups per category.
+   * A backup is protected if it's in the top N for ANY of its categories.
+   * Only deletes backups that exceed ALL applicable category quotas.
+   */
+  private async processTieredRetentionCleanup(): Promise<RetentionCleanupResult> {
+    const allBackups = await this.repository.getAllCompletedBackups();
+
+    if (allBackups.length === 0) {
+      logger.debug('No completed backups to process');
+      return {
+        scheduleId: 'tiered',
+        scheduleName: 'Tiered Retention',
+        deletedCount: 0,
+        retainedCount: 0,
+        freedBytes: 0,
+      };
+    }
+
+    // Build sets of protected backup IDs for each category
+    const protectedIds = new Set<string>();
+    const categoryRetained: Record<BackupCategory, string[]> = {
+      hourly: [],
+      daily: [],
+      weekly: [],
+      monthly: [],
+    };
+
+    // For each category, identify which backups to keep
+    const categories: BackupCategory[] = ['hourly', 'daily', 'weekly', 'monthly'];
+    for (const category of categories) {
+      const limit = TIERED_RETENTION[category];
+      const backupsInCategory = allBackups.filter(b =>
+        b.categories && b.categories.includes(category)
+      );
+
+      // Keep the top N (already sorted by started_at DESC)
+      const toKeep = backupsInCategory.slice(0, limit);
+      for (const backup of toKeep) {
+        protectedIds.add(backup.id);
+        categoryRetained[category].push(backup.id);
+      }
+
+      logger.debug('Category retention analysis', {
+        category,
+        limit,
+        totalInCategory: backupsInCategory.length,
+        keeping: toKeep.length,
+      });
+    }
+
+    // Find backups to delete (not protected by any category)
+    const backupsToDelete = allBackups.filter(b => !protectedIds.has(b.id));
+
+    logger.info('Tiered retention analysis complete', {
+      totalBackups: allBackups.length,
+      protected: protectedIds.size,
+      toDelete: backupsToDelete.length,
+      hourlyRetained: categoryRetained.hourly.length,
+      dailyRetained: categoryRetained.daily.length,
+      weeklyRetained: categoryRetained.weekly.length,
+      monthlyRetained: categoryRetained.monthly.length,
+    });
+
+    // Delete unprotected backups
+    let deletedCount = 0;
+    let freedBytes = 0;
+
+    for (const backup of backupsToDelete) {
+      try {
+        // Log retention decision with category reasoning
+        logger.info('Deleting backup - exceeded all category quotas', {
+          backupId: backup.id,
+          filename: backup.filename,
+          categories: backup.categories,
+          startedAt: backup.startedAt,
+          reason: this.buildDeletionReason(backup, categoryRetained),
+        });
+
+        // Delete the file
+        const filePath = (backup.metadata as any)?.archivePath || backup.filePath;
+        if (filePath) {
+          try {
+            const stats = await fsp.stat(filePath);
+            freedBytes += stats.size;
+            await fsp.unlink(filePath);
+          } catch (error) {
+            logger.warn('Failed to delete backup file', {
+              backupId: backup.id,
+              filePath,
+            });
+          }
+        }
+
+        // Delete the database record
+        await this.repository.deleteBackupRecord(backup.id);
+        deletedCount++;
+      } catch (error) {
+        logger.error('Failed to delete backup during retention cleanup', {
+          backupId: backup.id,
+          error: error instanceof Error ? error.message : String(error),
+        });
+      }
+    }
+
+    return {
+      scheduleId: 'tiered',
+      scheduleName: 'Tiered Retention',
+      deletedCount,
+      retainedCount: protectedIds.size,
+      freedBytes,
+    };
+  }
+
+  /**
+   * Builds a human-readable reason for why a backup is being deleted.
+   */
+  private buildDeletionReason(
+    backup: BackupHistory,
+    categoryRetained: Record<BackupCategory, string[]>
+  ): string {
+    const reasons: string[] = [];
+
+    for (const category of (backup.categories || ['hourly']) as BackupCategory[]) {
+      const kept = categoryRetained[category];
+      const limit = TIERED_RETENTION[category];
+      if (!kept.includes(backup.id)) {
+        reasons.push(`${category}: not in top ${limit}`);
+      }
+    }
+
+    return reasons.join('; ') || 'no categories';
+  }
+
  /**
   * Cleans up old backups for a specific schedule
   */
@@ -200,75 +323,4 @@ export class BackupRetentionService {
    return deletedCount;
  }

-  /**
-   * Cleans up orphaned backups (from deleted schedules)
-   * Keeps manual backups indefinitely
-   */
-  private async cleanupOrphanedBackups(): Promise<RetentionCleanupResult> {
-    const { items } = await this.repository.listBackups({
-      backupType: 'scheduled',
-      pageSize: 1000,
-    });
-
-    // Get all valid schedule IDs
-    const schedules = await this.repository.listSchedules();
-    const validScheduleIds = new Set(schedules.map(s => s.id));
-
-    // Find orphaned scheduled backups (schedule was deleted)
-    const orphanedBackups = items.filter(
-      backup => backup.scheduleId && !validScheduleIds.has(backup.scheduleId)
-    );
-
-    // Keep only the most recent 5 orphaned backups per deleted schedule
-    const orphansBySchedule = new Map<string, typeof orphanedBackups>();
-    for (const backup of orphanedBackups) {
-      const scheduleId = backup.scheduleId!;
-      if (!orphansBySchedule.has(scheduleId)) {
-        orphansBySchedule.set(scheduleId, []);
-      }
-      orphansBySchedule.get(scheduleId)!.push(backup);
-    }
-
-    let deletedCount = 0;
-    let freedBytes = 0;
-    let retainedCount = 0;
-
-    for (const [_scheduleId, backups] of orphansBySchedule) {
-      // Sort by date descending and keep first 5
-      backups.sort((a, b) => b.startedAt.getTime() - a.startedAt.getTime());
-      const toDelete = backups.slice(5);
-      retainedCount += Math.min(backups.length, 5);
-
-      for (const backup of toDelete) {
-        try {
-          const filePath = (backup.metadata as any)?.archivePath || backup.filePath;
-          if (filePath) {
-            try {
-              const stats = await fsp.stat(filePath);
-              freedBytes += stats.size;
-              await fsp.unlink(filePath);
-            } catch {
-              // File might not exist
-            }
-          }
-
-          await this.repository.deleteBackupRecord(backup.id);
-          deletedCount++;
-        } catch (error) {
-          logger.warn('Failed to delete orphaned backup', {
-            backupId: backup.id,
-            error: error instanceof Error ? error.message : String(error),
-          });
-        }
-      }
-    }
-
-    return {
-      scheduleId: 'orphaned',
-      scheduleName: 'Orphaned Backups',
-      deletedCount,
-      retainedCount,
-      freedBytes,
-    };
-  }
 }
--- a/backend/src/features/backup/domain/backup.service.ts
+++ b/backend/src/features/backup/domain/backup.service.ts
@@ -22,6 +22,7 @@ import {
  BackupFrequency,
  ScheduleResponse,
 } from './backup.types';
+import { classifyAndCalculateExpiration } from './backup-classification.service';

 export class BackupService {
  private repository: BackupRepository;
@@ -40,10 +41,14 @@ export class BackupService {
   * Creates a new backup
   */
  async createBackup(options: CreateBackupOptions): Promise<BackupResult> {
-    const timestamp = new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19);
+    const now = new Date();
+    const timestamp = now.toISOString().replace(/[:.]/g, '-').slice(0, 19);
    const tempFilename = `backup_${timestamp}`;

-    // Create initial backup record
+    // Classify the backup based on its creation timestamp
+    const { categories, expiresAt } = classifyAndCalculateExpiration(now);
+
+    // Create initial backup record with classification
    const backupRecord = await this.repository.createBackupRecord({
      scheduleId: options.scheduleId,
      backupType: options.backupType,
@@ -52,12 +57,16 @@ export class BackupService {
      fileSizeBytes: 0,
      createdBy: options.createdBy,
      metadata: { name: options.name },
+      categories,
+      expiresAt,
    });

    logger.info('Starting backup creation', {
      backupId: backupRecord.id,
      backupType: options.backupType,
      scheduleName: options.name,
+      categories,
+      expiresAt: expiresAt.toISOString(),
    });

    try {
--- a/backend/src/features/backup/domain/backup.types.ts
+++ b/backend/src/features/backup/domain/backup.types.ts
@@ -29,6 +29,17 @@ export const DEFAULT_RETENTION = {
  monthly: 12,
 } as const;

+/**
+ * Tiered retention counts for unified classification system.
+ * Each backup can belong to multiple categories; expiration is based on longest retention.
+ */
+export const TIERED_RETENTION = {
+  hourly: 8,
+  daily: 7,
+  weekly: 4,
+  monthly: 12,
+} as const;
+
 // ============================================
 // Enums and Union Types
 // ============================================
@@ -36,6 +47,7 @@ export const DEFAULT_RETENTION = {
 export type BackupFrequency = 'hourly' | 'daily' | 'weekly' | 'monthly';
 export type BackupType = 'scheduled' | 'manual';
 export type BackupStatus = 'in_progress' | 'completed' | 'failed';
+export type BackupCategory = 'hourly' | 'daily' | 'weekly' | 'monthly';

 // ============================================
 // Database Entity Types
@@ -69,6 +81,8 @@ export interface BackupHistory {
  completedAt: Date | null;
  createdBy: string | null;
  metadata: BackupMetadata;
+  categories: BackupCategory[];
+  expiresAt: Date | null;
 }

 export interface BackupSettings {
--- a/backend/src/features/backup/migrations/002_add_retention_categories.sql
+++ b/backend/src/features/backup/migrations/002_add_retention_categories.sql
@@ -0,0 +1,78 @@
+-- Migration: Add tiered retention classification columns
+-- Description: Adds categories array and expires_at for tiered backup retention
+-- Issue: #6 - Backup retention purges all backups
+
+-- ============================================
+-- Add new columns to backup_history
+-- ============================================
+ALTER TABLE backup_history
+ADD COLUMN IF NOT EXISTS categories TEXT[] DEFAULT '{}',
+ADD COLUMN IF NOT EXISTS expires_at TIMESTAMP WITH TIME ZONE;
+
+-- ============================================
+-- Indexes for efficient category queries
+-- ============================================
+CREATE INDEX IF NOT EXISTS idx_backup_history_categories ON backup_history USING GIN(categories);
+CREATE INDEX IF NOT EXISTS idx_backup_history_expires ON backup_history(expires_at);
+
+-- ============================================
+-- Populate categories for existing backups based on started_at
+-- Classification logic:
+--   - All backups: 'hourly'
+--   - Hour = 0 (midnight UTC): + 'daily'
+--   - Hour = 0 AND Sunday: + 'weekly'
+--   - Hour = 0 AND day = 1: + 'monthly'
+-- ============================================
+UPDATE backup_history
+SET categories = ARRAY(
+    SELECT unnest(
+        CASE
+            -- Midnight on Sunday, 1st of month: all categories
+            WHEN EXTRACT(HOUR FROM started_at AT TIME ZONE 'UTC') = 0
+                 AND EXTRACT(DOW FROM started_at AT TIME ZONE 'UTC') = 0
+                 AND EXTRACT(DAY FROM started_at AT TIME ZONE 'UTC') = 1
+            THEN ARRAY['hourly', 'daily', 'weekly', 'monthly']
+
+            -- Midnight on Sunday (not 1st): hourly + daily + weekly
+            WHEN EXTRACT(HOUR FROM started_at AT TIME ZONE 'UTC') = 0
+                 AND EXTRACT(DOW FROM started_at AT TIME ZONE 'UTC') = 0
+            THEN ARRAY['hourly', 'daily', 'weekly']
+
+            -- Midnight on 1st (not Sunday): hourly + daily + monthly
+            WHEN EXTRACT(HOUR FROM started_at AT TIME ZONE 'UTC') = 0
+                 AND EXTRACT(DAY FROM started_at AT TIME ZONE 'UTC') = 1
+            THEN ARRAY['hourly', 'daily', 'monthly']
+
+            -- Midnight (not Sunday, not 1st): hourly + daily
+            WHEN EXTRACT(HOUR FROM started_at AT TIME ZONE 'UTC') = 0
+            THEN ARRAY['hourly', 'daily']
+
+            -- Non-midnight: hourly only
+            ELSE ARRAY['hourly']
+        END
+    )
+)
+WHERE categories = '{}' OR categories IS NULL;
+
+-- ============================================
+-- Calculate expires_at based on categories
+-- Retention periods: hourly=8hrs, daily=7days, weekly=4wks, monthly=12mo
+-- Use longest applicable retention period
+-- ============================================
+UPDATE backup_history
+SET expires_at = CASE
+    WHEN 'monthly' = ANY(categories) THEN started_at + INTERVAL '12 months'
+    WHEN 'weekly' = ANY(categories) THEN started_at + INTERVAL '4 weeks'
+    WHEN 'daily' = ANY(categories) THEN started_at + INTERVAL '7 days'
+    ELSE started_at + INTERVAL '8 hours'
+END
+WHERE expires_at IS NULL;
+
+-- ============================================
+-- Add NOT NULL constraint after populating data
+-- ============================================
+ALTER TABLE backup_history
+ALTER COLUMN categories SET DEFAULT ARRAY['hourly']::TEXT[];
+
+-- Ensure all rows have categories
+UPDATE backup_history SET categories = ARRAY['hourly'] WHERE categories = '{}' OR categories IS NULL;
--- a/backend/src/features/backup/tests/unit/backup-classification.service.test.ts
+++ b/backend/src/features/backup/tests/unit/backup-classification.service.test.ts
@@ -0,0 +1,188 @@
+/**
+ * @ai-summary Unit tests for BackupClassificationService
+ * @ai-context Tests pure timestamp-based classification functions
+ */
+
+import {
+  classifyBackup,
+  calculateExpiration,
+  isFirstBackupOfDay,
+  isSunday,
+  isFirstDayOfMonth,
+  classifyAndCalculateExpiration,
+} from '../../domain/backup-classification.service';
+import { TIERED_RETENTION } from '../../domain/backup.types';
+
+describe('BackupClassificationService', () => {
+  describe('classifyBackup', () => {
+    it('should classify regular hourly backup (non-midnight)', () => {
+      // Tuesday, January 7, 2026 at 14:30 UTC
+      const timestamp = new Date('2026-01-07T14:30:00.000Z');
+      const categories = classifyBackup(timestamp);
+
+      expect(categories).toEqual(['hourly']);
+    });
+
+    it('should classify midnight backup as hourly + daily', () => {
+      // Wednesday, January 8, 2026 at 00:00 UTC
+      const timestamp = new Date('2026-01-08T00:00:00.000Z');
+      const categories = classifyBackup(timestamp);
+
+      expect(categories).toEqual(['hourly', 'daily']);
+    });
+
+    it('should classify Sunday midnight backup as hourly + daily + weekly', () => {
+      // Sunday, January 4, 2026 at 00:00 UTC
+      const timestamp = new Date('2026-01-04T00:00:00.000Z');
+      const categories = classifyBackup(timestamp);
+
+      expect(categories).toEqual(['hourly', 'daily', 'weekly']);
+    });
+
+    it('should classify 1st of month midnight backup as hourly + daily + monthly', () => {
+      // Thursday, January 1, 2026 at 00:00 UTC (not Sunday)
+      const timestamp = new Date('2026-01-01T00:00:00.000Z');
+      const categories = classifyBackup(timestamp);
+
+      expect(categories).toEqual(['hourly', 'daily', 'monthly']);
+    });
+
+    it('should classify Sunday 1st of month midnight as all categories', () => {
+      // Sunday, February 1, 2026 at 00:00 UTC
+      const timestamp = new Date('2026-02-01T00:00:00.000Z');
+      const categories = classifyBackup(timestamp);
+
+      expect(categories).toEqual(['hourly', 'daily', 'weekly', 'monthly']);
+    });
+
+    it('should not classify non-midnight on 1st as monthly', () => {
+      // Thursday, January 1, 2026 at 10:00 UTC
+      const timestamp = new Date('2026-01-01T10:00:00.000Z');
+      const categories = classifyBackup(timestamp);
+
+      expect(categories).toEqual(['hourly']);
+    });
+
+    it('should not classify non-midnight on Sunday as weekly', () => {
+      // Sunday, January 4, 2026 at 15:00 UTC
+      const timestamp = new Date('2026-01-04T15:00:00.000Z');
+      const categories = classifyBackup(timestamp);
+
+      expect(categories).toEqual(['hourly']);
+    });
+  });
+
+  describe('calculateExpiration', () => {
+    const baseTimestamp = new Date('2026-01-05T00:00:00.000Z');
+
+    it('should calculate 8 hours for hourly-only backup', () => {
+      const expiresAt = calculateExpiration(['hourly'], baseTimestamp);
+      const expectedDate = new Date('2026-01-05T08:00:00.000Z');
+
+      expect(expiresAt).toEqual(expectedDate);
+    });
+
+    it('should calculate 7 days for daily backup', () => {
+      const expiresAt = calculateExpiration(['hourly', 'daily'], baseTimestamp);
+      const expectedDate = new Date('2026-01-12T00:00:00.000Z');
+
+      expect(expiresAt).toEqual(expectedDate);
+    });
+
+    it('should calculate 4 weeks for weekly backup', () => {
+      const expiresAt = calculateExpiration(['hourly', 'daily', 'weekly'], baseTimestamp);
+      const expectedDate = new Date('2026-02-02T00:00:00.000Z');
+
+      expect(expiresAt).toEqual(expectedDate);
+    });
+
+    it('should calculate 12 months for monthly backup', () => {
+      const expiresAt = calculateExpiration(
+        ['hourly', 'daily', 'weekly', 'monthly'],
+        baseTimestamp
+      );
+      const expectedDate = new Date('2027-01-05T00:00:00.000Z');
+
+      expect(expiresAt).toEqual(expectedDate);
+    });
+
+    it('should use longest retention when monthly is present (even without weekly)', () => {
+      const expiresAt = calculateExpiration(['hourly', 'daily', 'monthly'], baseTimestamp);
+      const expectedDate = new Date('2027-01-05T00:00:00.000Z');
+
+      expect(expiresAt).toEqual(expectedDate);
+    });
+  });
+
+  describe('isFirstBackupOfDay', () => {
+    it('should return true for midnight UTC', () => {
+      const timestamp = new Date('2026-01-05T00:00:00.000Z');
+      expect(isFirstBackupOfDay(timestamp)).toBe(true);
+    });
+
+    it('should return false for non-midnight', () => {
+      const timestamp = new Date('2026-01-05T01:00:00.000Z');
+      expect(isFirstBackupOfDay(timestamp)).toBe(false);
+    });
+
+    it('should return true for midnight with minutes/seconds', () => {
+      // 00:30:45 is still hour 0
+      const timestamp = new Date('2026-01-05T00:30:45.000Z');
+      expect(isFirstBackupOfDay(timestamp)).toBe(true);
+    });
+  });
+
+  describe('isSunday', () => {
+    it('should return true for Sunday', () => {
+      // January 4, 2026 is a Sunday
+      const timestamp = new Date('2026-01-04T12:00:00.000Z');
+      expect(isSunday(timestamp)).toBe(true);
+    });
+
+    it('should return false for non-Sunday', () => {
+      // January 5, 2026 is a Monday
+      const timestamp = new Date('2026-01-05T12:00:00.000Z');
+      expect(isSunday(timestamp)).toBe(false);
+    });
+  });
+
+  describe('isFirstDayOfMonth', () => {
+    it('should return true for 1st of month', () => {
+      const timestamp = new Date('2026-01-01T12:00:00.000Z');
+      expect(isFirstDayOfMonth(timestamp)).toBe(true);
+    });
+
+    it('should return false for non-1st', () => {
+      const timestamp = new Date('2026-01-15T12:00:00.000Z');
+      expect(isFirstDayOfMonth(timestamp)).toBe(false);
+    });
+  });
+
+  describe('classifyAndCalculateExpiration', () => {
+    it('should return both categories and expiresAt', () => {
+      // Sunday, February 1, 2026 at 00:00 UTC - all categories
+      const timestamp = new Date('2026-02-01T00:00:00.000Z');
+      const result = classifyAndCalculateExpiration(timestamp);
+
+      expect(result.categories).toEqual(['hourly', 'daily', 'weekly', 'monthly']);
+      expect(result.expiresAt).toEqual(new Date('2027-02-01T00:00:00.000Z'));
+    });
+
+    it('should work for hourly-only backup', () => {
+      const timestamp = new Date('2026-01-07T14:30:00.000Z');
+      const result = classifyAndCalculateExpiration(timestamp);
+
+      expect(result.categories).toEqual(['hourly']);
+      expect(result.expiresAt).toEqual(new Date('2026-01-07T22:30:00.000Z'));
+    });
+  });
+
+  describe('TIERED_RETENTION constants', () => {
+    it('should have correct retention values', () => {
+      expect(TIERED_RETENTION.hourly).toBe(8);
+      expect(TIERED_RETENTION.daily).toBe(7);
+      expect(TIERED_RETENTION.weekly).toBe(4);
+      expect(TIERED_RETENTION.monthly).toBe(12);
+    });
+  });
+});
--- a/backend/src/features/documents/CLAUDE.md
+++ b/backend/src/features/documents/CLAUDE.md
@@ -0,0 +1,18 @@
+# documents/
+
+## Files
+
+| File | What | When to read |
+| ---- | ---- | ------------ |
+| `README.md` | Feature documentation | Understanding document management |
+| `index.ts` | Feature barrel export | Importing document services |
+
+## Subdirectories
+
+| Directory | What | When to read |
+| --------- | ---- | ------------ |
+| `api/` | HTTP endpoints and routes | API changes |
+| `domain/` | Business logic, services, types | Core document logic |
+| `data/` | Repository, database queries | Database operations |
+| `migrations/` | Database schema | Schema changes |
+| `tests/` | Unit and integration tests | Adding or modifying tests |
--- a/backend/src/features/documents/api/documents.controller.ts
+++ b/backend/src/features/documents/api/documents.controller.ts
@@ -8,12 +8,14 @@ import { Transform, TransformCallback } from 'stream';
 import crypto from 'crypto';
 import FileType from 'file-type';
 import { Readable } from 'stream';
+import { canAccessFeature, getFeatureConfig } from '../../../core/config/feature-tiers';
+import { SubscriptionTier } from '../../user-profile/domain/user-profile.types';

 export class DocumentsController {
  private readonly service = new DocumentsService();

  async list(request: FastifyRequest<{ Querystring: ListQuery }>, reply: FastifyReply) {
-    const userId = (request as any).user?.sub as string;
+    const userId = request.userContext!.userId;

    logger.info('Documents list requested', {
      operation: 'documents.list',
@@ -41,7 +43,7 @@ export class DocumentsController {
  }

  async get(request: FastifyRequest<{ Params: IdParams }>, reply: FastifyReply) {
-    const userId = (request as any).user?.sub as string;
+    const userId = request.userContext!.userId;
    const documentId = request.params.id;

    logger.info('Document get requested', {
@@ -72,7 +74,8 @@ export class DocumentsController {
  }

  async create(request: FastifyRequest<{ Body: CreateBody }>, reply: FastifyReply) {
-    const userId = (request as any).user?.sub as string;
+    const userId = request.userContext!.userId;
+    const userTier: SubscriptionTier = request.userContext?.subscriptionTier || 'free';

    logger.info('Document create requested', {
      operation: 'documents.create',
@@ -82,6 +85,26 @@ export class DocumentsController {
      title: request.body.title,
    });

+    // Tier validation: scanForMaintenance requires Pro tier
+    const featureKey = 'document.scanMaintenanceSchedule';
+    if (request.body.scanForMaintenance && !canAccessFeature(userTier, featureKey)) {
+      const config = getFeatureConfig(featureKey);
+      logger.warn('Tier required for scanForMaintenance', {
+        operation: 'documents.create.tier_required',
+        userId,
+        userTier,
+        requiredTier: config?.minTier,
+      });
+      return reply.code(403).send({
+        error: 'TIER_REQUIRED',
+        requiredTier: config?.minTier || 'pro',
+        currentTier: userTier,
+        feature: featureKey,
+        featureName: config?.name || null,
+        upgradePrompt: config?.upgradePrompt || 'Upgrade to Pro to access this feature.',
+      });
+    }
+
    const created = await this.service.createDocument(userId, request.body);

    logger.info('Document created', {
@@ -97,7 +120,8 @@ export class DocumentsController {
  }

  async update(request: FastifyRequest<{ Params: IdParams; Body: UpdateBody }>, reply: FastifyReply) {
-    const userId = (request as any).user?.sub as string;
+    const userId = request.userContext!.userId;
+    const userTier: SubscriptionTier = request.userContext?.subscriptionTier || 'free';
    const documentId = request.params.id;

    logger.info('Document update requested', {
@@ -107,6 +131,27 @@ export class DocumentsController {
      updateFields: Object.keys(request.body),
    });

+    // Tier validation: scanForMaintenance requires Pro tier
+    const featureKey = 'document.scanMaintenanceSchedule';
+    if (request.body.scanForMaintenance && !canAccessFeature(userTier, featureKey)) {
+      const config = getFeatureConfig(featureKey);
+      logger.warn('Tier required for scanForMaintenance', {
+        operation: 'documents.update.tier_required',
+        userId,
+        documentId,
+        userTier,
+        requiredTier: config?.minTier,
+      });
+      return reply.code(403).send({
+        error: 'TIER_REQUIRED',
+        requiredTier: config?.minTier || 'pro',
+        currentTier: userTier,
+        feature: featureKey,
+        featureName: config?.name || null,
+        upgradePrompt: config?.upgradePrompt || 'Upgrade to Pro to access this feature.',
+      });
+    }
+
    const updated = await this.service.updateDocument(userId, documentId, request.body);
    if (!updated) {
      logger.warn('Document not found for update', {
@@ -129,7 +174,7 @@ export class DocumentsController {
  }

  async remove(request: FastifyRequest<{ Params: IdParams }>, reply: FastifyReply) {
-    const userId = (request as any).user?.sub as string;
+    const userId = request.userContext!.userId;
    const documentId = request.params.id;

    logger.info('Document delete requested', {
@@ -176,7 +221,7 @@ export class DocumentsController {
  }

  async upload(request: FastifyRequest<{ Params: IdParams }>, reply: FastifyReply) {
-    const userId = (request as any).user?.sub as string;
+    const userId = request.userContext!.userId;
    const documentId = request.params.id;

    logger.info('Document upload requested', {
@@ -227,20 +272,15 @@ export class DocumentsController {
      });
    }

-    // Read first 4100 bytes to detect file type via magic bytes
+    // Collect ALL file chunks first (breaking early from async iterator corrupts stream state)
    const chunks: Buffer[] = [];
-    let totalBytes = 0;
-    const targetBytes = 4100;
-
    for await (const chunk of mp.file) {
      chunks.push(chunk);
-      totalBytes += chunk.length;
-      if (totalBytes >= targetBytes) {
-        break;
-      }
    }
+    const fullBuffer = Buffer.concat(chunks);

-    const headerBuffer = Buffer.concat(chunks);
+    // Use first 4100 bytes for file type detection via magic bytes
+    const headerBuffer = fullBuffer.subarray(0, Math.min(4100, fullBuffer.length));

    // Validate actual file content using magic bytes
    const detectedType = await FileType.fromBuffer(headerBuffer);
@@ -296,15 +336,9 @@ export class DocumentsController {

    const counter = new CountingStream();

-    // Create a new readable stream from the header buffer + remaining file chunks
-    const headerStream = Readable.from([headerBuffer]);
-    const remainingStream = mp.file;
-
-    // Pipe header first, then remaining content through counter
-    headerStream.pipe(counter, { end: false });
-    headerStream.on('end', () => {
-      remainingStream.pipe(counter);
-    });
+    // Create readable stream from the complete buffer and pipe through counter
+    const fileStream = Readable.from([fullBuffer]);
+    fileStream.pipe(counter);

    const storage = getStorageService();
    const bucket = 'documents';
@@ -339,7 +373,7 @@ export class DocumentsController {
  }

  async download(request: FastifyRequest<{ Params: IdParams }>, reply: FastifyReply) {
-    const userId = (request as any).user?.sub as string;
+    const userId = request.userContext!.userId;
    const documentId = request.params.id;

    logger.info('Document download requested', {
@@ -387,6 +421,165 @@ export class DocumentsController {
    const stream = await storage.getObjectStream(doc.storageBucket, doc.storageKey);
    return reply.send(stream);
  }
+
+  async listByVehicle(request: FastifyRequest<{ Params: { vehicleId: string } }>, reply: FastifyReply) {
+    const userId = request.userContext!.userId;
+    const vehicleId = request.params.vehicleId;
+
+    logger.info('Documents by vehicle requested', {
+      operation: 'documents.listByVehicle',
+      userId,
+      vehicleId,
+    });
+
+    try {
+      const docs = await this.service.getDocumentsByVehicle(userId, vehicleId);
+
+      logger.info('Documents by vehicle retrieved', {
+        operation: 'documents.listByVehicle.success',
+        userId,
+        vehicleId,
+        documentCount: docs.length,
+      });
+
+      return reply.code(200).send(docs);
+    } catch (e: any) {
+      if (e.statusCode === 403) {
+        logger.warn('Vehicle not found or not owned', {
+          operation: 'documents.listByVehicle.forbidden',
+          userId,
+          vehicleId,
+        });
+        return reply.code(403).send({ error: 'Forbidden', message: e.message });
+      }
+      throw e;
+    }
+  }
+
+  async addVehicle(request: FastifyRequest<{ Params: { id: string; vehicleId: string } }>, reply: FastifyReply) {
+    const userId = request.userContext!.userId;
+    const { id: documentId, vehicleId } = request.params;
+
+    logger.info('Add vehicle to document requested', {
+      operation: 'documents.addVehicle',
+      userId,
+      documentId,
+      vehicleId,
+    });
+
+    try {
+      const updated = await this.service.addVehicleToDocument(userId, documentId, vehicleId);
+
+      if (!updated) {
+        logger.warn('Document not updated (possibly duplicate vehicle)', {
+          operation: 'documents.addVehicle.not_updated',
+          userId,
+          documentId,
+          vehicleId,
+        });
+        return reply.code(400).send({ error: 'Bad Request', message: 'Vehicle could not be added' });
+      }
+
+      logger.info('Vehicle added to document', {
+        operation: 'documents.addVehicle.success',
+        userId,
+        documentId,
+        vehicleId,
+        sharedVehicleCount: updated.sharedVehicleIds.length,
+      });
+
+      return reply.code(200).send(updated);
+    } catch (e: any) {
+      if (e.statusCode === 404) {
+        logger.warn('Document not found for adding vehicle', {
+          operation: 'documents.addVehicle.not_found',
+          userId,
+          documentId,
+          vehicleId,
+        });
+        return reply.code(404).send({ error: 'Not Found', message: e.message });
+      }
+      if (e.statusCode === 400) {
+        logger.warn('Bad request for adding vehicle', {
+          operation: 'documents.addVehicle.bad_request',
+          userId,
+          documentId,
+          vehicleId,
+          reason: e.message,
+        });
+        return reply.code(400).send({ error: 'Bad Request', message: e.message });
+      }
+      if (e.statusCode === 403) {
+        logger.warn('Forbidden - vehicle not owned', {
+          operation: 'documents.addVehicle.forbidden',
+          userId,
+          documentId,
+          vehicleId,
+        });
+        return reply.code(403).send({ error: 'Forbidden', message: e.message });
+      }
+      throw e;
+    }
+  }
+
+  async removeVehicle(request: FastifyRequest<{ Params: { id: string; vehicleId: string } }>, reply: FastifyReply) {
+    const userId = request.userContext!.userId;
+    const { id: documentId, vehicleId } = request.params;
+
+    logger.info('Remove vehicle from document requested', {
+      operation: 'documents.removeVehicle',
+      userId,
+      documentId,
+      vehicleId,
+    });
+
+    try {
+      const updated = await this.service.removeVehicleFromDocument(userId, documentId, vehicleId);
+
+      if (!updated) {
+        // Document was soft deleted
+        logger.info('Document soft deleted (primary vehicle removed, no shared vehicles)', {
+          operation: 'documents.removeVehicle.deleted',
+          userId,
+          documentId,
+          vehicleId,
+        });
+        return reply.code(204).send();
+      }
+
+      logger.info('Vehicle removed from document', {
+        operation: 'documents.removeVehicle.success',
+        userId,
+        documentId,
+        vehicleId,
+        sharedVehicleCount: updated.sharedVehicleIds.length,
+        primaryVehicleId: updated.vehicleId,
+      });
+
+      return reply.code(200).send(updated);
+    } catch (e: any) {
+      if (e.statusCode === 404) {
+        logger.warn('Document not found for removing vehicle', {
+          operation: 'documents.removeVehicle.not_found',
+          userId,
+          documentId,
+          vehicleId,
+        });
+        return reply.code(404).send({ error: 'Not Found', message: e.message });
+      }
+      if (e.statusCode === 400) {
+        logger.warn('Bad request for removing vehicle', {
+          operation: 'documents.removeVehicle.bad_request',
+          userId,
+          documentId,
+          vehicleId,
+          reason: e.message,
+        });
+        return reply.code(400).send({ error: 'Bad Request', message: e.message });
+      }
+      throw e;
+    }
+  }
 }

 function cryptoRandom(): string {
--- a/backend/src/features/documents/api/documents.routes.ts
+++ b/backend/src/features/documents/api/documents.routes.ts
@@ -22,16 +22,6 @@ export const documentsRoutes: FastifyPluginAsync = async (
    handler: ctrl.get.bind(ctrl)
  });

-  fastify.get<{ Params: any }>('/documents/vehicle/:vehicleId', {
-    preHandler: [requireAuth],
-    handler: async (req, reply) => {
-      const userId = (req as any).user?.sub as string;
-      const query = { vehicleId: (req.params as any).vehicleId };
-      const docs = await ctrl['service'].listDocuments(userId, query);
-      return reply.code(200).send(docs);
-    }
-  });
-
  fastify.post<{ Body: any }>('/documents', {
    preHandler: [requireAuth],
    handler: ctrl.create.bind(ctrl)
@@ -56,4 +46,20 @@ export const documentsRoutes: FastifyPluginAsync = async (
    preHandler: [requireAuth],
    handler: ctrl.download.bind(ctrl)
  });
+
+  // Vehicle management routes
+  fastify.get<{ Params: any }>('/documents/by-vehicle/:vehicleId', {
+    preHandler: [requireAuth],
+    handler: ctrl.listByVehicle.bind(ctrl)
+  });
+
+  fastify.post<{ Params: any }>('/documents/:id/vehicles/:vehicleId', {
+    preHandler: [requireAuth],
+    handler: ctrl.addVehicle.bind(ctrl)
+  });
+
+  fastify.delete<{ Params: any }>('/documents/:id/vehicles/:vehicleId', {
+    preHandler: [requireAuth],
+    handler: ctrl.removeVehicle.bind(ctrl)
+  });
 };
--- a/backend/src/features/documents/api/documents.validation.ts
+++ b/backend/src/features/documents/api/documents.validation.ts
@@ -9,6 +9,10 @@ export const ListQuerySchema = z.object({

 export const IdParamsSchema = z.object({ id: z.string().uuid() });
 export const VehicleParamsSchema = z.object({ vehicleId: z.string().uuid() });
+export const DocumentVehicleParamsSchema = z.object({
+  id: z.string().uuid(),
+  vehicleId: z.string().uuid()
+});

 export const CreateBodySchema = CreateDocumentBodySchema;
 export const UpdateBodySchema = UpdateDocumentBodySchema;
@@ -16,6 +20,7 @@ export const UpdateBodySchema = UpdateDocumentBodySchema;
 export type ListQuery = z.infer<typeof ListQuerySchema>;
 export type IdParams = z.infer<typeof IdParamsSchema>;
 export type VehicleParams = z.infer<typeof VehicleParamsSchema>;
+export type DocumentVehicleParams = z.infer<typeof DocumentVehicleParamsSchema>;
 export type CreateBody = z.infer<typeof CreateBodySchema>;
 export type UpdateBody = z.infer<typeof UpdateBodySchema>;

--- a/backend/src/features/documents/data/documents.repository.ts
+++ b/backend/src/features/documents/data/documents.repository.ts
@@ -28,6 +28,7 @@ export class DocumentsRepository {
      expirationDate: row.expiration_date,
      emailNotifications: row.email_notifications,
      scanForMaintenance: row.scan_for_maintenance,
+      sharedVehicleIds: row.shared_vehicle_ids || [],
      createdAt: row.created_at,
      updatedAt: row.updated_at,
      deletedAt: row.deleted_at
@@ -50,11 +51,12 @@ export class DocumentsRepository {
    expirationDate?: string | null;
    emailNotifications?: boolean;
    scanForMaintenance?: boolean;
+    sharedVehicleIds?: string[];
  }): Promise<DocumentRecord> {
    const res = await this.db.query(
      `INSERT INTO documents (
-        id, user_id, vehicle_id, document_type, title, notes, details, issued_date, expiration_date, email_notifications, scan_for_maintenance
-      ) VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11)
+        id, user_id, vehicle_id, document_type, title, notes, details, issued_date, expiration_date, email_notifications, scan_for_maintenance, shared_vehicle_ids
+      ) VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12)
      RETURNING *`,
      [
        doc.id,
@@ -68,6 +70,7 @@ export class DocumentsRepository {
        doc.expirationDate ?? null,
        doc.emailNotifications ?? false,
        doc.scanForMaintenance ?? false,
+        doc.sharedVehicleIds ?? [],
      ]
    );
    return this.mapDocumentRecord(res.rows[0]);
@@ -90,11 +93,71 @@ export class DocumentsRepository {
    return res.rows.map(row => this.mapDocumentRecord(row));
  }

+  async batchInsert(
+    documents: Array<{
+      id: string;
+      userId: string;
+      vehicleId: string;
+      documentType: DocumentType;
+      title: string;
+      notes?: string | null;
+      details?: any;
+      issuedDate?: string | null;
+      expirationDate?: string | null;
+      emailNotifications?: boolean;
+      scanForMaintenance?: boolean;
+      sharedVehicleIds?: string[];
+    }>,
+    client?: any
+  ): Promise<DocumentRecord[]> {
+    if (documents.length === 0) {
+      return [];
+    }
+
+    // Multi-value INSERT for performance (avoids N round-trips)
+    const queryClient = client || this.db;
+    const placeholders: string[] = [];
+    const values: any[] = [];
+    let paramCount = 1;
+
+    documents.forEach((doc) => {
+      const docParams = [
+        doc.id,
+        doc.userId,
+        doc.vehicleId,
+        doc.documentType,
+        doc.title,
+        doc.notes ?? null,
+        doc.details ?? null,
+        doc.issuedDate ?? null,
+        doc.expirationDate ?? null,
+        doc.emailNotifications ?? false,
+        doc.scanForMaintenance ?? false,
+        doc.sharedVehicleIds ?? []
+      ];
+
+      const placeholder = `($${paramCount++}, $${paramCount++}, $${paramCount++}, $${paramCount++}, $${paramCount++}, $${paramCount++}, $${paramCount++}, $${paramCount++}, $${paramCount++}, $${paramCount++}, $${paramCount++}, $${paramCount++})`;
+      placeholders.push(placeholder);
+      values.push(...docParams);
+    });
+
+    const query = `
+      INSERT INTO documents (
+        id, user_id, vehicle_id, document_type, title, notes, details, issued_date, expiration_date, email_notifications, scan_for_maintenance, shared_vehicle_ids
+      )
+      VALUES ${placeholders.join(', ')}
+      RETURNING *
+    `;
+
+    const result = await queryClient.query(query, values);
+    return result.rows.map((row: any) => this.mapDocumentRecord(row));
+  }
+
  async softDelete(id: string, userId: string): Promise<void> {
    await this.db.query(`UPDATE documents SET deleted_at = NOW() WHERE id = $1 AND user_id = $2`, [id, userId]);
  }

-  async updateMetadata(id: string, userId: string, patch: Partial<Pick<DocumentRecord, 'title'|'notes'|'details'|'issuedDate'|'expirationDate'|'emailNotifications'|'scanForMaintenance'>>): Promise<DocumentRecord | null> {
+  async updateMetadata(id: string, userId: string, patch: Partial<Pick<DocumentRecord, 'title'|'notes'|'details'|'issuedDate'|'expirationDate'|'emailNotifications'|'scanForMaintenance'|'sharedVehicleIds'>>): Promise<DocumentRecord | null> {
    const fields: string[] = [];
    const params: any[] = [];
    let i = 1;
@@ -105,6 +168,7 @@ export class DocumentsRepository {
    if (patch.expirationDate !== undefined) { fields.push(`expiration_date = $${i++}`); params.push(patch.expirationDate); }
    if (patch.emailNotifications !== undefined) { fields.push(`email_notifications = $${i++}`); params.push(patch.emailNotifications); }
    if (patch.scanForMaintenance !== undefined) { fields.push(`scan_for_maintenance = $${i++}`); params.push(patch.scanForMaintenance); }
+    if (patch.sharedVehicleIds !== undefined) { fields.push(`shared_vehicle_ids = $${i++}`); params.push(patch.sharedVehicleIds); }
    if (!fields.length) return this.findById(id, userId);
    params.push(id, userId);
    const sql = `UPDATE documents SET ${fields.join(', ')} WHERE id = $${i++} AND user_id = $${i++} AND deleted_at IS NULL RETURNING *`;
@@ -129,5 +193,56 @@ export class DocumentsRepository {
    );
    return res.rows[0] ? this.mapDocumentRecord(res.rows[0]) : null;
  }
+
+  // ========================
+  // Shared Vehicle Operations (Atomic)
+  // ========================
+
+  /**
+   * Atomically add a vehicle to the shared_vehicle_ids array.
+   * Uses PostgreSQL array_append() to avoid race conditions.
+   */
+  async addSharedVehicle(docId: string, userId: string, vehicleId: string): Promise<DocumentRecord | null> {
+    const res = await this.db.query(
+      `UPDATE documents
+       SET shared_vehicle_ids = array_append(shared_vehicle_ids, $1::uuid)
+       WHERE id = $2 AND user_id = $3 AND deleted_at IS NULL
+         AND NOT ($1::uuid = ANY(shared_vehicle_ids))
+       RETURNING *`,
+      [vehicleId, docId, userId]
+    );
+    return res.rows[0] ? this.mapDocumentRecord(res.rows[0]) : null;
+  }
+
+  /**
+   * Atomically remove a vehicle from the shared_vehicle_ids array.
+   * Uses PostgreSQL array_remove() to avoid race conditions.
+   */
+  async removeSharedVehicle(docId: string, userId: string, vehicleId: string): Promise<DocumentRecord | null> {
+    const res = await this.db.query(
+      `UPDATE documents
+       SET shared_vehicle_ids = array_remove(shared_vehicle_ids, $1::uuid)
+       WHERE id = $2 AND user_id = $3 AND deleted_at IS NULL
+       RETURNING *`,
+      [vehicleId, docId, userId]
+    );
+    return res.rows[0] ? this.mapDocumentRecord(res.rows[0]) : null;
+  }
+
+  /**
+   * List all documents associated with a vehicle (either as primary or shared).
+   * Returns documents where vehicle_id = vehicleId OR vehicleId = ANY(shared_vehicle_ids).
+   */
+  async listByVehicle(userId: string, vehicleId: string): Promise<DocumentRecord[]> {
+    const res = await this.db.query(
+      `SELECT * FROM documents
+       WHERE user_id = $1
+         AND deleted_at IS NULL
+         AND (vehicle_id = $2 OR $2::uuid = ANY(shared_vehicle_ids))
+       ORDER BY created_at DESC`,
+      [userId, vehicleId]
+    );
+    return res.rows.map(row => this.mapDocumentRecord(row));
+  }
 }

--- a/backend/src/features/documents/domain/documents.service.ts
+++ b/backend/src/features/documents/domain/documents.service.ts
@@ -1,15 +1,32 @@
 import { randomUUID } from 'crypto';
 import type { CreateDocumentBody, DocumentRecord, DocumentType, UpdateDocumentBody } from './documents.types';
 import { DocumentsRepository } from '../data/documents.repository';
+import { OwnershipCostsService } from '../../ownership-costs/domain/ownership-costs.service';
+import type { OwnershipCostType } from '../../ownership-costs/domain/ownership-costs.types';
 import pool from '../../../core/config/database';

 export class DocumentsService {
  private readonly repo = new DocumentsRepository(pool);
+  private readonly ownershipCostsService = new OwnershipCostsService(pool);

  async createDocument(userId: string, body: CreateDocumentBody): Promise<DocumentRecord> {
    await this.assertVehicleOwnership(userId, body.vehicleId);
+
+    // Validate shared vehicles if provided (insurance type only)
+    if (body.sharedVehicleIds && body.sharedVehicleIds.length > 0) {
+      if (body.documentType !== 'insurance') {
+        const err: any = new Error('Shared vehicles are only supported for insurance documents');
+        err.statusCode = 400;
+        throw err;
+      }
+      // Validate ownership of all shared vehicles
+      for (const vid of body.sharedVehicleIds) {
+        await this.assertVehicleOwnership(userId, vid);
+      }
+    }
+
    const id = randomUUID();
-    return this.repo.insert({
+    const doc = await this.repo.insert({
      id,
      userId,
      vehicleId: body.vehicleId,
@@ -21,7 +38,72 @@ export class DocumentsService {
      expirationDate: body.expirationDate ?? null,
      emailNotifications: body.emailNotifications ?? false,
      scanForMaintenance: body.scanForMaintenance ?? false,
+      sharedVehicleIds: body.sharedVehicleIds ?? [],
    });
+
+    // Auto-create ownership_cost when insurance/registration has cost data
+    await this.autoCreateOwnershipCost(userId, doc, body);
+
+    return doc;
+  }
+
+  /**
+   * Auto-creates an ownership_cost record when an insurance or registration
+   * document is created with cost data (premium or cost field in details).
+   */
+  private async autoCreateOwnershipCost(
+    userId: string,
+    doc: DocumentRecord,
+    body: CreateDocumentBody
+  ): Promise<void> {
+    const costType = this.mapDocumentTypeToCostType(body.documentType);
+    if (!costType) return; // Not a cost-linkable document type
+
+    const costAmount = this.extractCostAmount(body);
+    if (!costAmount || costAmount <= 0) return; // No valid cost data
+
+    try {
+      await this.ownershipCostsService.createCost(userId, {
+        vehicleId: body.vehicleId,
+        documentId: doc.id,
+        costType,
+        amount: costAmount,
+        description: doc.title,
+        periodStart: body.issuedDate,
+        periodEnd: body.expirationDate,
+      });
+    } catch (err) {
+      // Log but don't fail document creation if cost creation fails
+      console.error('Failed to auto-create ownership cost for document:', doc.id, err);
+    }
+  }
+
+  /**
+   * Maps document types to ownership cost types.
+   * Returns null for document types that don't auto-create costs.
+   */
+  private mapDocumentTypeToCostType(documentType: string): OwnershipCostType | null {
+    const typeMap: Record<string, OwnershipCostType> = {
+      'insurance': 'insurance',
+      'registration': 'registration',
+    };
+    return typeMap[documentType] || null;
+  }
+
+  /**
+   * Extracts cost amount from document details.
+   * Insurance uses 'premium', registration uses 'cost'.
+   */
+  private extractCostAmount(body: CreateDocumentBody): number | null {
+    if (!body.details) return null;
+
+    const premium = body.details.premium;
+    const cost = body.details.cost;
+
+    if (typeof premium === 'number' && premium > 0) return premium;
+    if (typeof cost === 'number' && cost > 0) return cost;
+
+    return null;
  }

  async getDocument(userId: string, id: string): Promise<DocumentRecord | null> {
@@ -35,16 +117,184 @@ export class DocumentsService {
  async updateDocument(userId: string, id: string, patch: UpdateDocumentBody) {
    const existing = await this.repo.findById(id, userId);
    if (!existing) return null;
+
+    // Validate shared vehicles if provided (insurance type only)
+    if (patch.sharedVehicleIds !== undefined) {
+      if (existing.documentType !== 'insurance') {
+        const err: any = new Error('Shared vehicles are only supported for insurance documents');
+        err.statusCode = 400;
+        throw err;
+      }
+      // Validate ownership of all shared vehicles
+      for (const vid of patch.sharedVehicleIds) {
+        await this.assertVehicleOwnership(userId, vid);
+      }
+    }
+
    if (patch && typeof patch === 'object') {
-      return this.repo.updateMetadata(id, userId, patch as any);
+      const updated = await this.repo.updateMetadata(id, userId, patch as any);
+
+      // Sync cost changes to linked ownership_cost if applicable
+      if (updated && patch.details) {
+        await this.syncOwnershipCost(userId, updated, patch);
+      }
+
+      return updated;
    }
    return existing;
  }

+  /**
+   * Syncs cost data changes to linked ownership_cost record.
+   * If document has linked cost and details.premium/cost changed, update it.
+   */
+  private async syncOwnershipCost(
+    userId: string,
+    doc: DocumentRecord,
+    patch: UpdateDocumentBody
+  ): Promise<void> {
+    const costType = this.mapDocumentTypeToCostType(doc.documentType);
+    if (!costType) return;
+
+    const newCostAmount = this.extractCostAmountFromDetails(patch.details);
+    if (newCostAmount === null) return; // No cost in update
+
+    try {
+      // Find existing linked cost
+      const linkedCosts = await this.ownershipCostsService.getCosts(userId, { documentId: doc.id });
+
+      if (linkedCosts.length > 0 && newCostAmount > 0) {
+        // Update existing linked cost
+        await this.ownershipCostsService.updateCost(userId, linkedCosts[0].id, {
+          amount: newCostAmount,
+          periodStart: patch.issuedDate ?? undefined,
+          periodEnd: patch.expirationDate ?? undefined,
+        });
+      } else if (linkedCosts.length === 0 && newCostAmount > 0) {
+        // Create new cost if none exists
+        await this.ownershipCostsService.createCost(userId, {
+          vehicleId: doc.vehicleId,
+          documentId: doc.id,
+          costType,
+          amount: newCostAmount,
+          description: doc.title,
+          periodStart: patch.issuedDate ?? doc.issuedDate ?? undefined,
+          periodEnd: patch.expirationDate ?? doc.expirationDate ?? undefined,
+        });
+      }
+    } catch (err) {
+      console.error('Failed to sync ownership cost for document:', doc.id, err);
+    }
+  }
+
+  /**
+   * Extracts cost amount from details object (for updates).
+   */
+  private extractCostAmountFromDetails(details?: Record<string, any> | null): number | null {
+    if (!details) return null;
+
+    const premium = details.premium;
+    const cost = details.cost;
+
+    if (typeof premium === 'number') return premium;
+    if (typeof cost === 'number') return cost;
+
+    return null;
+  }
+
  async deleteDocument(userId: string, id: string): Promise<void> {
+    // Note: Linked ownership_cost records are CASCADE deleted via FK
    await this.repo.softDelete(id, userId);
  }

+  async addVehicleToDocument(userId: string, docId: string, vehicleId: string): Promise<DocumentRecord | null> {
+    // Validate document exists and is owned by user
+    const doc = await this.repo.findById(docId, userId);
+    if (!doc) {
+      const err: any = new Error('Document not found');
+      err.statusCode = 404;
+      throw err;
+    }
+
+    // Only insurance documents support shared vehicles
+    if (doc.documentType !== 'insurance') {
+      const err: any = new Error('Shared vehicles are only supported for insurance documents');
+      err.statusCode = 400;
+      throw err;
+    }
+
+    // Validate vehicle ownership
+    await this.assertVehicleOwnership(userId, vehicleId);
+
+    // Check if vehicle is already the primary vehicle
+    if (doc.vehicleId === vehicleId) {
+      const err: any = new Error('Vehicle is already the primary vehicle for this document');
+      err.statusCode = 400;
+      throw err;
+    }
+
+    // Add to shared vehicles (repository handles duplicate check)
+    return this.repo.addSharedVehicle(docId, userId, vehicleId);
+  }
+
+  async removeVehicleFromDocument(userId: string, docId: string, vehicleId: string): Promise<DocumentRecord | null> {
+    // Validate document exists and is owned by user
+    const doc = await this.repo.findById(docId, userId);
+    if (!doc) {
+      const err: any = new Error('Document not found');
+      err.statusCode = 404;
+      throw err;
+    }
+
+    // Context-aware delete logic
+    const isSharedVehicle = doc.sharedVehicleIds.includes(vehicleId);
+    const isPrimaryVehicle = doc.vehicleId === vehicleId;
+
+    if (!isSharedVehicle && !isPrimaryVehicle) {
+      const err: any = new Error('Vehicle is not associated with this document');
+      err.statusCode = 400;
+      throw err;
+    }
+
+    // Case 1: Removing from shared vehicles only
+    if (isSharedVehicle && !isPrimaryVehicle) {
+      return this.repo.removeSharedVehicle(docId, userId, vehicleId);
+    }
+
+    // Case 2: Removing primary vehicle with no shared vehicles -> soft delete document
+    if (isPrimaryVehicle && doc.sharedVehicleIds.length === 0) {
+      await this.repo.softDelete(docId, userId);
+      return null;
+    }
+
+    // Case 3: Removing primary vehicle with shared vehicles -> promote first shared to primary
+    if (isPrimaryVehicle && doc.sharedVehicleIds.length > 0) {
+      const newPrimaryId = doc.sharedVehicleIds[0];
+      const remainingShared = doc.sharedVehicleIds.slice(1);
+
+      // Update primary vehicle and remaining shared vehicles
+      return this.repo.updateMetadata(docId, userId, {
+        sharedVehicleIds: remainingShared,
+      }).then(async () => {
+        // Update vehicle_id separately as it's not part of the metadata update
+        const res = await pool.query(
+          'UPDATE documents SET vehicle_id = $1 WHERE id = $2 AND user_id = $3 AND deleted_at IS NULL RETURNING *',
+          [newPrimaryId, docId, userId]
+        );
+        if (!res.rows[0]) return null;
+        return this.repo.findById(docId, userId);
+      });
+    }
+
+    return null;
+  }
+
+  async getDocumentsByVehicle(userId: string, vehicleId: string): Promise<DocumentRecord[]> {
+    // Validate vehicle ownership
+    await this.assertVehicleOwnership(userId, vehicleId);
+    return this.repo.listByVehicle(userId, vehicleId);
+  }
+
  private async assertVehicleOwnership(userId: string, vehicleId: string) {
    const res = await pool.query('SELECT id FROM vehicles WHERE id = $1 AND user_id = $2', [vehicleId, userId]);
    if (!res.rows[0]) {
--- a/backend/src/features/documents/domain/documents.types.ts
+++ b/backend/src/features/documents/domain/documents.types.ts
@@ -22,6 +22,7 @@ export interface DocumentRecord {
  expirationDate?: string | null;
  emailNotifications?: boolean;
  scanForMaintenance?: boolean;
+  sharedVehicleIds: string[];
  createdAt: string;
  updatedAt: string;
  deletedAt?: string | null;
@@ -38,6 +39,7 @@ export const CreateDocumentBodySchema = z.object({
  expirationDate: z.string().optional(),
  emailNotifications: z.boolean().optional(),
  scanForMaintenance: z.boolean().optional(),
+  sharedVehicleIds: z.array(z.string().uuid()).optional(),
 });
 export type CreateDocumentBody = z.infer<typeof CreateDocumentBodySchema>;

@@ -49,6 +51,7 @@ export const UpdateDocumentBodySchema = z.object({
  expirationDate: z.string().nullable().optional(),
  emailNotifications: z.boolean().optional(),
  scanForMaintenance: z.boolean().optional(),
+  sharedVehicleIds: z.array(z.string().uuid()).optional(),
 });
 export type UpdateDocumentBody = z.infer<typeof UpdateDocumentBodySchema>;

--- a/backend/src/features/documents/migrations/003_reset_scan_for_maintenance_free_users.sql
+++ b/backend/src/features/documents/migrations/003_reset_scan_for_maintenance_free_users.sql
@@ -0,0 +1,10 @@
+-- Migration: Reset scanForMaintenance for free tier users
+-- This migration is part of the tier-gating feature implementation.
+-- scanForMaintenance is now a Pro feature, so existing free users with it enabled need to be reset.
+
+UPDATE documents d
+SET scan_for_maintenance = false
+FROM user_profiles u
+WHERE d.user_id = u.auth0_sub
+  AND u.subscription_tier = 'free'
+  AND d.scan_for_maintenance = true;
--- a/backend/src/features/documents/migrations/004_add_shared_vehicle_ids.sql
+++ b/backend/src/features/documents/migrations/004_add_shared_vehicle_ids.sql
@@ -0,0 +1,18 @@
+-- Migration: Add shared_vehicle_ids array column for cross-vehicle document sharing
+-- Issue: #31
+-- Allows a document to be shared with multiple vehicles beyond its primary vehicle_id
+
+-- Add shared_vehicle_ids column with default empty array
+ALTER TABLE documents
+  ADD COLUMN shared_vehicle_ids UUID[] DEFAULT '{}' NOT NULL;
+
+-- Add GIN index for efficient array membership queries
+-- This allows fast lookups of "which documents are shared with vehicle X"
+CREATE INDEX idx_documents_shared_vehicle_ids ON documents USING GIN (shared_vehicle_ids array_ops);
+
+-- Example usage:
+-- 1. Find all documents shared with a specific vehicle:
+--    SELECT * FROM documents WHERE 'vehicle-uuid-here' = ANY(shared_vehicle_ids);
+--
+-- 2. Find documents by primary OR shared vehicle:
+--    SELECT * FROM documents WHERE vehicle_id = 'uuid' OR 'uuid' = ANY(shared_vehicle_ids);
--- a/backend/src/features/documents/tests/unit/documents.controller.tier.test.ts
+++ b/backend/src/features/documents/tests/unit/documents.controller.tier.test.ts
@@ -0,0 +1,299 @@
+/**
+ * @ai-summary Unit tests for tier validation in DocumentsController
+ * @ai-context Tests that free users cannot use scanForMaintenance feature
+ */
+
+// Mock config and dependencies first (before any imports that might use them)
+jest.mock('../../../../core/config/config-loader', () => ({
+  appConfig: {
+    getDatabaseUrl: () => 'postgresql://mock:mock@localhost/mock',
+    getRedisUrl: () => 'redis://localhost',
+    get: () => ({}),
+  },
+  config: {
+    database: { connectionString: 'mock' },
+    redis: { url: 'mock' },
+    auth0: { domain: 'mock', clientId: 'mock', audience: 'mock' },
+    storage: { provider: 'filesystem', root: '/tmp' },
+    logging: { level: 'error' },
+  },
+}));
+jest.mock('../../../../core/config/database', () => ({
+  pool: {
+    query: jest.fn(),
+    connect: jest.fn(),
+    end: jest.fn(),
+  },
+  default: {
+    query: jest.fn(),
+    connect: jest.fn(),
+    end: jest.fn(),
+  },
+}));
+jest.mock('../../../../core/logging/logger', () => ({
+  logger: {
+    info: jest.fn(),
+    warn: jest.fn(),
+    error: jest.fn(),
+    debug: jest.fn(),
+  },
+}));
+jest.mock('../../../../core/storage/storage.service', () => ({
+  getStorageService: jest.fn(() => ({
+    putObject: jest.fn(),
+    getObjectStream: jest.fn(),
+    deleteObject: jest.fn(),
+    headObject: jest.fn(),
+  })),
+}));
+jest.mock('../../domain/documents.service');
+
+import { FastifyRequest, FastifyReply } from 'fastify';
+import { DocumentsController } from '../../api/documents.controller';
+import { DocumentsService } from '../../domain/documents.service';
+
+const MockedService = jest.mocked(DocumentsService);
+
+describe('DocumentsController - Tier Validation', () => {
+  let controller: DocumentsController;
+  let mockServiceInstance: jest.Mocked<DocumentsService>;
+
+  const createMockRequest = (overrides: Partial<FastifyRequest> = {}): FastifyRequest => ({
+    user: { sub: 'user-123' },
+    userContext: {
+      userId: 'user-123',
+      email: 'test@example.com',
+      emailVerified: true,
+      onboardingCompleted: true,
+      isAdmin: false,
+      subscriptionTier: 'free',
+    },
+    body: {},
+    params: {},
+    query: {},
+    ...overrides,
+  } as unknown as FastifyRequest);
+
+  const createMockReply = (): Partial<FastifyReply> & { payload?: unknown; statusCode?: number } => ({
+    sent: false,
+    code: jest.fn(function(this: any, status: number) {
+      this.statusCode = status;
+      return this;
+    }),
+    send: jest.fn(function(this: any, payload: unknown) {
+      this.payload = payload;
+      this.sent = true;
+      return this;
+    }),
+  });
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+
+    mockServiceInstance = {
+      createDocument: jest.fn(),
+      updateDocument: jest.fn(),
+      getDocument: jest.fn(),
+      listDocuments: jest.fn(),
+      deleteDocument: jest.fn(),
+    } as any;
+
+    MockedService.mockImplementation(() => mockServiceInstance);
+    controller = new DocumentsController();
+  });
+
+  describe('create - scanForMaintenance tier gating', () => {
+    const baseDocumentBody = {
+      vehicleId: 'vehicle-123',
+      documentType: 'manual',
+      title: 'Service Manual',
+    };
+
+    it('allows free user to create document without scanForMaintenance', async () => {
+      const request = createMockRequest({
+        body: { ...baseDocumentBody, scanForMaintenance: false },
+      });
+      const reply = createMockReply();
+
+      mockServiceInstance.createDocument.mockResolvedValue({
+        id: 'doc-123',
+        userId: 'user-123',
+        vehicleId: 'vehicle-123',
+        documentType: 'manual',
+        title: 'Service Manual',
+        scanForMaintenance: false,
+      } as any);
+
+      await controller.create(request as any, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(201);
+      expect(mockServiceInstance.createDocument).toHaveBeenCalled();
+    });
+
+    it('blocks free user from using scanForMaintenance=true', async () => {
+      const request = createMockRequest({
+        body: { ...baseDocumentBody, scanForMaintenance: true },
+      });
+      const reply = createMockReply();
+
+      await controller.create(request as any, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(403);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'TIER_REQUIRED',
+          requiredTier: 'pro',
+          currentTier: 'free',
+          feature: 'document.scanMaintenanceSchedule',
+          featureName: 'Scan for Maintenance Schedule',
+        })
+      );
+      expect(mockServiceInstance.createDocument).not.toHaveBeenCalled();
+    });
+
+    it('allows pro user to use scanForMaintenance=true', async () => {
+      const request = createMockRequest({
+        body: { ...baseDocumentBody, scanForMaintenance: true },
+        userContext: {
+          userId: 'user-123',
+          email: 'pro@example.com',
+          emailVerified: true,
+          onboardingCompleted: true,
+          isAdmin: false,
+          subscriptionTier: 'pro',
+        },
+      });
+      const reply = createMockReply();
+
+      mockServiceInstance.createDocument.mockResolvedValue({
+        id: 'doc-123',
+        userId: 'user-123',
+        vehicleId: 'vehicle-123',
+        documentType: 'manual',
+        title: 'Service Manual',
+        scanForMaintenance: true,
+      } as any);
+
+      await controller.create(request as any, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(201);
+      expect(mockServiceInstance.createDocument).toHaveBeenCalled();
+    });
+
+    it('allows enterprise user to use scanForMaintenance=true', async () => {
+      const request = createMockRequest({
+        body: { ...baseDocumentBody, scanForMaintenance: true },
+        userContext: {
+          userId: 'user-123',
+          email: 'enterprise@example.com',
+          emailVerified: true,
+          onboardingCompleted: true,
+          isAdmin: false,
+          subscriptionTier: 'enterprise',
+        },
+      });
+      const reply = createMockReply();
+
+      mockServiceInstance.createDocument.mockResolvedValue({
+        id: 'doc-123',
+        userId: 'user-123',
+        vehicleId: 'vehicle-123',
+        documentType: 'manual',
+        title: 'Service Manual',
+        scanForMaintenance: true,
+      } as any);
+
+      await controller.create(request as any, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(201);
+      expect(mockServiceInstance.createDocument).toHaveBeenCalled();
+    });
+
+    it('defaults to free tier when userContext is missing', async () => {
+      const request = createMockRequest({
+        body: { ...baseDocumentBody, scanForMaintenance: true },
+        userContext: undefined,
+      });
+      const reply = createMockReply();
+
+      await controller.create(request as any, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(403);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'TIER_REQUIRED',
+          currentTier: 'free',
+        })
+      );
+    });
+  });
+
+  describe('update - scanForMaintenance tier gating', () => {
+    const documentId = 'doc-123';
+
+    it('allows free user to update document without scanForMaintenance', async () => {
+      const request = createMockRequest({
+        params: { id: documentId },
+        body: { title: 'Updated Title' },
+      });
+      const reply = createMockReply();
+
+      mockServiceInstance.updateDocument.mockResolvedValue({
+        id: documentId,
+        title: 'Updated Title',
+      } as any);
+
+      await controller.update(request as any, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(200);
+      expect(mockServiceInstance.updateDocument).toHaveBeenCalled();
+    });
+
+    it('blocks free user from setting scanForMaintenance=true on update', async () => {
+      const request = createMockRequest({
+        params: { id: documentId },
+        body: { scanForMaintenance: true },
+      });
+      const reply = createMockReply();
+
+      await controller.update(request as any, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(403);
+      expect(reply.send).toHaveBeenCalledWith(
+        expect.objectContaining({
+          error: 'TIER_REQUIRED',
+          requiredTier: 'pro',
+          currentTier: 'free',
+          feature: 'document.scanMaintenanceSchedule',
+        })
+      );
+      expect(mockServiceInstance.updateDocument).not.toHaveBeenCalled();
+    });
+
+    it('allows pro user to set scanForMaintenance=true on update', async () => {
+      const request = createMockRequest({
+        params: { id: documentId },
+        body: { scanForMaintenance: true },
+        userContext: {
+          userId: 'user-123',
+          email: 'pro@example.com',
+          emailVerified: true,
+          onboardingCompleted: true,
+          isAdmin: false,
+          subscriptionTier: 'pro',
+        },
+      });
+      const reply = createMockReply();
+
+      mockServiceInstance.updateDocument.mockResolvedValue({
+        id: documentId,
+        scanForMaintenance: true,
+      } as any);
+
+      await controller.update(request as any, reply as FastifyReply);
+
+      expect(reply.code).toHaveBeenCalledWith(200);
+      expect(mockServiceInstance.updateDocument).toHaveBeenCalled();
+    });
+  });
+});
--- a/backend/src/features/email-ingestion/api/email-ingestion.controller.ts
+++ b/backend/src/features/email-ingestion/api/email-ingestion.controller.ts
@@ -0,0 +1,188 @@
+/**
+ * @ai-summary Controller for Resend inbound email webhook and user-facing pending association endpoints
+ * @ai-context Webhook handler (public) + pending association CRUD (JWT-authenticated)
+ */
+
+import { FastifyRequest, FastifyReply } from 'fastify';
+import { ResendInboundClient } from '../external/resend-inbound.client';
+import { EmailIngestionRepository } from '../data/email-ingestion.repository';
+import { EmailIngestionService } from '../domain/email-ingestion.service';
+import { logger } from '../../../core/logging/logger';
+import type { ResendWebhookEvent } from '../domain/email-ingestion.types';
+
+export class EmailIngestionController {
+  private resendClient: ResendInboundClient;
+  private repository: EmailIngestionRepository;
+  private service: EmailIngestionService;
+
+  constructor() {
+    this.resendClient = new ResendInboundClient();
+    this.repository = new EmailIngestionRepository();
+    this.service = new EmailIngestionService();
+  }
+
+  // ========================
+  // Pending Association Endpoints (JWT-authenticated)
+  // ========================
+
+  async getPendingAssociations(request: FastifyRequest, reply: FastifyReply): Promise<void> {
+    try {
+      const userId = request.userContext!.userId;
+      const associations = await this.repository.getPendingAssociations(userId);
+      return reply.code(200).send(associations);
+    } catch (error: any) {
+      logger.error('Error listing pending associations', { error: error.message, userId: request.userContext?.userId });
+      return reply.code(500).send({ error: 'Failed to list pending associations' });
+    }
+  }
+
+  async getPendingAssociationCount(request: FastifyRequest, reply: FastifyReply): Promise<void> {
+    try {
+      const userId = request.userContext!.userId;
+      const count = await this.repository.getPendingAssociationCount(userId);
+      return reply.code(200).send({ count });
+    } catch (error: any) {
+      logger.error('Error counting pending associations', { error: error.message, userId: request.userContext?.userId });
+      return reply.code(500).send({ error: 'Failed to count pending associations' });
+    }
+  }
+
+  async resolveAssociation(
+    request: FastifyRequest<{ Params: { id: string }; Body: { vehicleId: string } }>,
+    reply: FastifyReply
+  ): Promise<void> {
+    try {
+      const userId = request.userContext!.userId;
+      const { id } = request.params;
+      const { vehicleId } = request.body;
+
+      if (!vehicleId || typeof vehicleId !== 'string') {
+        return reply.code(400).send({ error: 'vehicleId is required' });
+      }
+
+      const result = await this.service.resolveAssociation(id, vehicleId, userId);
+      return reply.code(200).send(result);
+    } catch (error: any) {
+      const userId = request.userContext?.userId;
+      logger.error('Error resolving pending association', {
+        error: error.message,
+        associationId: request.params.id,
+        userId,
+      });
+
+      if (error.message === 'Pending association not found' || error.message === 'Vehicle not found') {
+        return reply.code(404).send({ error: error.message });
+      }
+      if (error.message === 'Unauthorized') {
+        return reply.code(403).send({ error: 'Not authorized' });
+      }
+      if (error.message === 'Association already resolved') {
+        return reply.code(409).send({ error: error.message });
+      }
+
+      return reply.code(500).send({ error: 'Failed to resolve association' });
+    }
+  }
+
+  async dismissAssociation(
+    request: FastifyRequest<{ Params: { id: string } }>,
+    reply: FastifyReply
+  ): Promise<void> {
+    try {
+      const userId = request.userContext!.userId;
+      const { id } = request.params;
+
+      await this.service.dismissAssociation(id, userId);
+      return reply.code(204).send();
+    } catch (error: any) {
+      const userId = request.userContext?.userId;
+      logger.error('Error dismissing pending association', {
+        error: error.message,
+        associationId: request.params.id,
+        userId,
+      });
+
+      if (error.message === 'Pending association not found') {
+        return reply.code(404).send({ error: error.message });
+      }
+      if (error.message === 'Unauthorized') {
+        return reply.code(403).send({ error: 'Not authorized' });
+      }
+      if (error.message === 'Association already resolved') {
+        return reply.code(409).send({ error: error.message });
+      }
+
+      return reply.code(500).send({ error: 'Failed to dismiss association' });
+    }
+  }
+
+  // ========================
+  // Webhook Endpoint (Public)
+  // ========================
+
+  async handleInboundWebhook(request: FastifyRequest, reply: FastifyReply): Promise<void> {
+    try {
+      const rawBody = (request as any).rawBody;
+      if (!rawBody) {
+        logger.error('Missing raw body in Resend webhook request');
+        return reply.status(400).send({ error: 'Missing raw body' });
+      }
+
+      // Extract Svix headers for signature verification
+      const headers: Record<string, string> = {
+        'svix-id': (request.headers['svix-id'] as string) || '',
+        'svix-timestamp': (request.headers['svix-timestamp'] as string) || '',
+        'svix-signature': (request.headers['svix-signature'] as string) || '',
+      };
+
+      // Verify webhook signature
+      let event: ResendWebhookEvent;
+      try {
+        event = this.resendClient.verifyWebhookSignature(rawBody, headers);
+      } catch (error: any) {
+        logger.warn('Invalid Resend webhook signature', { error: error.message });
+        return reply.status(400).send({ error: 'Invalid signature' });
+      }
+
+      const emailId = event.data.email_id;
+      const senderEmail = event.data.from;
+
+      // Idempotency check: reject if email_id already exists in queue
+      const existing = await this.repository.findByEmailId(emailId);
+      if (existing) {
+        logger.info('Duplicate email webhook received, skipping', { emailId });
+        return reply.status(200).send({ received: true, duplicate: true });
+      }
+
+      // Insert queue record with status=pending via repository
+      await this.repository.insertQueueEntry({
+        emailId,
+        senderEmail,
+        userId: senderEmail, // Resolved to auth0_sub during processing
+        receivedAt: event.data.created_at || new Date().toISOString(),
+        subject: event.data.subject,
+      });
+
+      logger.info('Inbound email queued for processing', { emailId, senderEmail });
+
+      // Return 200 immediately before processing begins
+      reply.status(200).send({ received: true });
+
+      // Trigger async processing via setImmediate
+      setImmediate(() => {
+        this.service.processEmail(emailId, event).catch((error) => {
+          logger.error('Async email processing failed', {
+            emailId,
+            error: error instanceof Error ? error.message : String(error),
+          });
+        });
+      });
+    } catch (error: any) {
+      logger.error('Resend webhook handler error', {
+        error: error.message,
+        stack: error.stack,
+      });
+      return reply.status(500).send({ error: 'Webhook processing failed' });
+    }
+  }
+}
--- a/backend/src/features/email-ingestion/api/email-ingestion.routes.ts
+++ b/backend/src/features/email-ingestion/api/email-ingestion.routes.ts
@@ -0,0 +1,60 @@
+/**
+ * @ai-summary Resend inbound webhook + user-facing pending association routes
+ * @ai-context Public webhook (no JWT) + authenticated CRUD for pending vehicle associations
+ */
+
+import { FastifyPluginAsync } from 'fastify';
+import { EmailIngestionController } from './email-ingestion.controller';
+
+/** Public webhook route - no JWT auth, uses Svix signature verification */
+export const emailIngestionWebhookRoutes: FastifyPluginAsync = async (fastify) => {
+  const controller = new EmailIngestionController();
+
+  // POST /api/webhooks/resend/inbound - PUBLIC endpoint (no JWT auth)
+  // Resend authenticates via webhook signature verification (Svix)
+  // rawBody MUST be enabled for signature verification to work
+  fastify.post(
+    '/webhooks/resend/inbound',
+    {
+      config: {
+        rawBody: true,
+      },
+    },
+    controller.handleInboundWebhook.bind(controller)
+  );
+};
+
+/** Authenticated user-facing routes for pending vehicle associations */
+export const emailIngestionRoutes: FastifyPluginAsync = async (fastify) => {
+  const controller = new EmailIngestionController();
+
+  // GET /api/email-ingestion/pending - List pending associations for authenticated user
+  fastify.get('/email-ingestion/pending', {
+    preHandler: [fastify.authenticate],
+    handler: controller.getPendingAssociations.bind(controller),
+  });
+
+  // GET /api/email-ingestion/pending/count - Get count of pending associations
+  fastify.get('/email-ingestion/pending/count', {
+    preHandler: [fastify.authenticate],
+    handler: controller.getPendingAssociationCount.bind(controller),
+  });
+
+  // POST /api/email-ingestion/pending/:id/resolve - Resolve by selecting vehicle
+  fastify.post<{ Params: { id: string }; Body: { vehicleId: string } }>(
+    '/email-ingestion/pending/:id/resolve',
+    {
+      preHandler: [fastify.authenticate],
+      handler: controller.resolveAssociation.bind(controller),
+    }
+  );
+
+  // DELETE /api/email-ingestion/pending/:id - Dismiss/discard a pending association
+  fastify.delete<{ Params: { id: string } }>(
+    '/email-ingestion/pending/:id',
+    {
+      preHandler: [fastify.authenticate],
+      handler: controller.dismissAssociation.bind(controller),
+    }
+  );
+};
--- a/backend/src/features/email-ingestion/data/email-ingestion.repository.ts
+++ b/backend/src/features/email-ingestion/data/email-ingestion.repository.ts
@@ -0,0 +1,257 @@
+/**
+ * @ai-summary Data access layer for email ingestion queue and pending vehicle associations
+ * @ai-context Provides CRUD operations with standard mapRow() snake_case -> camelCase conversion
+ */
+
+import { Pool } from 'pg';
+import pool from '../../../core/config/database';
+import { logger } from '../../../core/logging/logger';
+import type {
+  EmailIngestionQueueRecord,
+  EmailIngestionStatus,
+  EmailProcessingResult,
+  PendingVehicleAssociation,
+  PendingAssociationStatus,
+  EmailRecordType,
+  ExtractedReceiptData,
+} from '../domain/email-ingestion.types';
+
+export class EmailIngestionRepository {
+  constructor(private readonly db: Pool = pool) {}
+
+  // ========================
+  // Row Mappers
+  // ========================
+
+  private mapQueueRow(row: any): EmailIngestionQueueRecord {
+    return {
+      id: row.id,
+      emailId: row.email_id,
+      senderEmail: row.sender_email,
+      userId: row.user_id,
+      receivedAt: row.received_at,
+      subject: row.subject,
+      status: row.status,
+      processingResult: row.processing_result,
+      errorMessage: row.error_message,
+      retryCount: row.retry_count,
+      createdAt: row.created_at,
+      updatedAt: row.updated_at,
+    };
+  }
+
+  private mapPendingAssociationRow(row: any): PendingVehicleAssociation {
+    return {
+      id: row.id,
+      userId: row.user_id,
+      recordType: row.record_type,
+      extractedData: row.extracted_data,
+      documentId: row.document_id,
+      status: row.status,
+      createdAt: row.created_at,
+      resolvedAt: row.resolved_at,
+    };
+  }
+
+  // ========================
+  // Queue Operations
+  // ========================
+
+  async insertQueueEntry(entry: {
+    emailId: string;
+    senderEmail: string;
+    userId: string;
+    receivedAt: string;
+    subject: string | null;
+  }): Promise<EmailIngestionQueueRecord> {
+    try {
+      const res = await this.db.query(
+        `INSERT INTO email_ingestion_queue
+          (email_id, sender_email, user_id, received_at, subject, status)
+        VALUES ($1, $2, $3, $4, $5, 'pending')
+        RETURNING *`,
+        [
+          entry.emailId,
+          entry.senderEmail,
+          entry.userId,
+          entry.receivedAt,
+          entry.subject,
+        ]
+      );
+      return this.mapQueueRow(res.rows[0]);
+    } catch (error) {
+      logger.error('Error inserting queue entry', { error, emailId: entry.emailId });
+      throw error;
+    }
+  }
+
+  async updateQueueStatus(
+    emailId: string,
+    status: EmailIngestionStatus,
+    updates?: {
+      processingResult?: EmailProcessingResult;
+      errorMessage?: string;
+      retryCount?: number;
+      userId?: string;
+    }
+  ): Promise<EmailIngestionQueueRecord | null> {
+    try {
+      const fields: string[] = ['status = $2'];
+      const params: any[] = [emailId, status];
+      let paramIndex = 3;
+
+      if (updates?.processingResult !== undefined) {
+        fields.push(`processing_result = $${paramIndex++}`);
+        params.push(JSON.stringify(updates.processingResult));
+      }
+      if (updates?.errorMessage !== undefined) {
+        fields.push(`error_message = $${paramIndex++}`);
+        params.push(updates.errorMessage);
+      }
+      if (updates?.retryCount !== undefined) {
+        fields.push(`retry_count = $${paramIndex++}`);
+        params.push(updates.retryCount);
+      }
+      if (updates?.userId !== undefined) {
+        fields.push(`user_id = $${paramIndex++}`);
+        params.push(updates.userId);
+      }
+
+      const res = await this.db.query(
+        `UPDATE email_ingestion_queue
+        SET ${fields.join(', ')}
+        WHERE email_id = $1
+        RETURNING *`,
+        params
+      );
+      return res.rows[0] ? this.mapQueueRow(res.rows[0]) : null;
+    } catch (error) {
+      logger.error('Error updating queue status', { error, emailId, status });
+      throw error;
+    }
+  }
+
+  async getQueueEntry(emailId: string): Promise<EmailIngestionQueueRecord | null> {
+    try {
+      const res = await this.db.query(
+        `SELECT * FROM email_ingestion_queue WHERE email_id = $1`,
+        [emailId]
+      );
+      return res.rows[0] ? this.mapQueueRow(res.rows[0]) : null;
+    } catch (error) {
+      logger.error('Error fetching queue entry', { error, emailId });
+      throw error;
+    }
+  }
+
+  async findByEmailId(emailId: string): Promise<EmailIngestionQueueRecord | null> {
+    return this.getQueueEntry(emailId);
+  }
+
+  async getRetryableEntries(maxRetries: number = 3): Promise<EmailIngestionQueueRecord[]> {
+    try {
+      const res = await this.db.query(
+        `SELECT * FROM email_ingestion_queue
+        WHERE status = 'failed'
+          AND retry_count < $1
+        ORDER BY created_at ASC`,
+        [maxRetries]
+      );
+      return res.rows.map(row => this.mapQueueRow(row));
+    } catch (error) {
+      logger.error('Error fetching retryable entries', { error });
+      throw error;
+    }
+  }
+
+  // ========================
+  // Pending Association Operations
+  // ========================
+
+  async insertPendingAssociation(association: {
+    userId: string;
+    recordType: EmailRecordType;
+    extractedData: ExtractedReceiptData;
+    documentId: string | null;
+  }): Promise<PendingVehicleAssociation> {
+    try {
+      const res = await this.db.query(
+        `INSERT INTO pending_vehicle_associations
+          (user_id, record_type, extracted_data, document_id, status)
+        VALUES ($1, $2, $3, $4, 'pending')
+        RETURNING *`,
+        [
+          association.userId,
+          association.recordType,
+          JSON.stringify(association.extractedData),
+          association.documentId,
+        ]
+      );
+      return this.mapPendingAssociationRow(res.rows[0]);
+    } catch (error) {
+      logger.error('Error inserting pending association', { error, userId: association.userId });
+      throw error;
+    }
+  }
+
+  async getPendingAssociationById(associationId: string): Promise<PendingVehicleAssociation | null> {
+    try {
+      const res = await this.db.query(
+        `SELECT * FROM pending_vehicle_associations WHERE id = $1`,
+        [associationId]
+      );
+      return res.rows[0] ? this.mapPendingAssociationRow(res.rows[0]) : null;
+    } catch (error) {
+      logger.error('Error fetching pending association by id', { error, associationId });
+      throw error;
+    }
+  }
+
+  async getPendingAssociationCount(userId: string): Promise<number> {
+    try {
+      const res = await this.db.query(
+        `SELECT COUNT(*)::int AS count FROM pending_vehicle_associations
+        WHERE user_id = $1 AND status = 'pending'`,
+        [userId]
+      );
+      return res.rows[0]?.count ?? 0;
+    } catch (error) {
+      logger.error('Error counting pending associations', { error, userId });
+      throw error;
+    }
+  }
+
+  async getPendingAssociations(userId: string): Promise<PendingVehicleAssociation[]> {
+    try {
+      const res = await this.db.query(
+        `SELECT * FROM pending_vehicle_associations
+        WHERE user_id = $1 AND status = 'pending'
+        ORDER BY created_at DESC`,
+        [userId]
+      );
+      return res.rows.map(row => this.mapPendingAssociationRow(row));
+    } catch (error) {
+      logger.error('Error fetching pending associations', { error, userId });
+      throw error;
+    }
+  }
+
+  async resolvePendingAssociation(
+    associationId: string,
+    status: PendingAssociationStatus = 'resolved'
+  ): Promise<PendingVehicleAssociation | null> {
+    try {
+      const res = await this.db.query(
+        `UPDATE pending_vehicle_associations
+        SET status = $2, resolved_at = CURRENT_TIMESTAMP
+        WHERE id = $1
+        RETURNING *`,
+        [associationId, status]
+      );
+      return res.rows[0] ? this.mapPendingAssociationRow(res.rows[0]) : null;
+    } catch (error) {
+      logger.error('Error resolving pending association', { error, associationId });
+      throw error;
+    }
+  }
+}
--- a/backend/src/features/email-ingestion/domain/email-ingestion.service.ts
+++ b/backend/src/features/email-ingestion/domain/email-ingestion.service.ts
@@ -0,0 +1,844 @@
+/**
+ * @ai-summary Core processing service for the email-to-record pipeline
+ * @ai-context Orchestrates sender validation, OCR extraction, record classification,
+ *   vehicle association, status tracking, and retry logic. Delegates all notifications
+ *   (emails, in-app, logging) to EmailIngestionNotificationHandler.
+ */
+
+import { Pool } from 'pg';
+import pool from '../../../core/config/database';
+import { logger } from '../../../core/logging/logger';
+import { EmailIngestionRepository } from '../data/email-ingestion.repository';
+import { ResendInboundClient, type ParsedEmailAttachment } from '../external/resend-inbound.client';
+import { UserProfileRepository } from '../../user-profile/data/user-profile.repository';
+import { VehiclesRepository } from '../../vehicles/data/vehicles.repository';
+import { NotificationsRepository } from '../../notifications/data/notifications.repository';
+import { TemplateService } from '../../notifications/domain/template.service';
+import { EmailService } from '../../notifications/domain/email.service';
+import { ocrService } from '../../ocr/domain/ocr.service';
+import type { ReceiptExtractionResponse } from '../../ocr/domain/ocr.types';
+import { ReceiptClassifier } from './receipt-classifier';
+import { EmailIngestionNotificationHandler } from './notification-handler';
+import { FuelLogsService } from '../../fuel-logs/domain/fuel-logs.service';
+import { FuelLogsRepository } from '../../fuel-logs/data/fuel-logs.repository';
+import { FuelType } from '../../fuel-logs/domain/fuel-logs.types';
+import type { EnhancedCreateFuelLogRequest } from '../../fuel-logs/domain/fuel-logs.types';
+import { MaintenanceService } from '../../maintenance/domain/maintenance.service';
+import type { MaintenanceCategory } from '../../maintenance/domain/maintenance.types';
+import { validateSubtypes, getSubtypesForCategory } from '../../maintenance/domain/maintenance.types';
+import type {
+  ResendWebhookEvent,
+  EmailProcessingResult,
+  ExtractedReceiptData,
+  EmailRecordType,
+} from './email-ingestion.types';
+
+/** Supported attachment MIME types */
+const SUPPORTED_ATTACHMENT_TYPES = new Set([
+  'application/pdf',
+  'image/png',
+  'image/jpeg',
+  'image/heic',
+  'image/heif',
+]);
+
+/** Image types that work with receipt-specific OCR */
+const OCR_RECEIPT_IMAGE_TYPES = new Set([
+  'image/jpeg',
+  'image/png',
+  'image/heic',
+  'image/heif',
+]);
+
+const MAX_ATTACHMENT_SIZE = 10 * 1024 * 1024; // 10MB
+const MAX_RETRY_COUNT = 3;
+
+export class EmailIngestionService {
+  private repository: EmailIngestionRepository;
+  private resendClient: ResendInboundClient;
+  private userProfileRepository: UserProfileRepository;
+  private vehiclesRepository: VehiclesRepository;
+  private notificationHandler: EmailIngestionNotificationHandler;
+  private classifier: ReceiptClassifier;
+  private fuelLogsService: FuelLogsService;
+  private maintenanceService: MaintenanceService;
+
+  constructor(dbPool?: Pool) {
+    const p = dbPool || pool;
+    this.repository = new EmailIngestionRepository(p);
+    this.resendClient = new ResendInboundClient();
+    this.userProfileRepository = new UserProfileRepository(p);
+    this.vehiclesRepository = new VehiclesRepository(p);
+    const notificationsRepository = new NotificationsRepository(p);
+    this.notificationHandler = new EmailIngestionNotificationHandler(
+      notificationsRepository,
+      new TemplateService(),
+      new EmailService(),
+    );
+    this.classifier = new ReceiptClassifier();
+    this.fuelLogsService = new FuelLogsService(new FuelLogsRepository(p));
+    this.maintenanceService = new MaintenanceService();
+  }
+
+  // ========================
+  // Main Processing Pipeline
+  // ========================
+
+  /**
+   * Process an inbound email through the full pipeline.
+   * Called asynchronously after webhook receipt is acknowledged.
+   */
+  async processEmail(emailId: string, event: ResendWebhookEvent): Promise<void> {
+    const senderEmail = event.data.from;
+    const subject = event.data.subject;
+
+    try {
+      // 1. Mark as processing
+      await this.repository.updateQueueStatus(emailId, 'processing');
+
+      // 2. Validate sender
+      const userProfile = await this.validateSender(senderEmail);
+      if (!userProfile) {
+        await this.handleUnregisteredSender(emailId, senderEmail);
+        return;
+      }
+
+      const userId = userProfile.auth0Sub;
+      const userName = userProfile.displayName || userProfile.email;
+
+      // Update queue with resolved user_id
+      await this.repository.updateQueueStatus(emailId, 'processing', { userId });
+
+      // 3. Get attachments (from webhook data or by fetching raw email)
+      const attachments = await this.getAttachments(emailId, event);
+
+      // 4. Filter valid attachments
+      const validAttachments = this.filterAttachments(attachments);
+      if (validAttachments.length === 0) {
+        await this.handleNoValidAttachments(emailId, userId, userName, senderEmail);
+        return;
+      }
+
+      // 5. Classify receipt from email text first
+      const emailClassification = this.classifier.classifyFromText(subject, event.data.text);
+      logger.info('Email text classification result', {
+        emailId,
+        type: emailClassification.type,
+        confidence: emailClassification.confidence,
+      });
+
+      // 6. Process attachments through OCR using classification
+      const ocrResult = await this.processAttachmentsWithClassification(
+        userId, validAttachments, emailClassification, emailId
+      );
+      if (!ocrResult) {
+        await this.handleOcrFailure(emailId, userId, userName, senderEmail, 'No receipt data could be extracted from attachments');
+        return;
+      }
+
+      // 7. Build extracted data from OCR result
+      const extractedData = this.mapOcrToExtractedData(ocrResult.response);
+      const recordType = ocrResult.recordType;
+
+      // 8. Handle vehicle association
+      const processingResult = await this.handleVehicleAssociation(
+        userId, userName, senderEmail, recordType, extractedData
+      );
+
+      // 9. Mark as completed
+      await this.repository.updateQueueStatus(emailId, 'completed', {
+        processingResult,
+      });
+
+      logger.info('Email processing completed successfully', {
+        emailId,
+        userId,
+        recordType,
+        vehicleId: processingResult.vehicleId,
+        pendingAssociationId: processingResult.pendingAssociationId,
+      });
+    } catch (error) {
+      await this.handleProcessingError(emailId, senderEmail, subject, error);
+    }
+  }
+
+  // ========================
+  // Sender Validation
+  // ========================
+
+  private async validateSender(senderEmail: string): Promise<{
+    auth0Sub: string;
+    email: string;
+    displayName: string | null;
+  } | null> {
+    // Case-insensitive lookup by lowercasing the sender email
+    const profile = await this.userProfileRepository.getByEmail(senderEmail.toLowerCase());
+    if (profile) {
+      return {
+        auth0Sub: profile.auth0Sub,
+        email: profile.email,
+        displayName: profile.displayName ?? null,
+      };
+    }
+
+    // Try original case as fallback
+    if (senderEmail !== senderEmail.toLowerCase()) {
+      const fallback = await this.userProfileRepository.getByEmail(senderEmail);
+      if (fallback) {
+        return {
+          auth0Sub: fallback.auth0Sub,
+          email: fallback.email,
+          displayName: fallback.displayName ?? null,
+        };
+      }
+    }
+
+    return null;
+  }
+
+  // ========================
+  // Attachment Handling
+  // ========================
+
+  /**
+   * Get attachments from webhook data or by fetching the raw email
+   */
+  private async getAttachments(
+    emailId: string,
+    event: ResendWebhookEvent
+  ): Promise<ParsedEmailAttachment[]> {
+    // If webhook includes attachments with content, use those
+    if (event.data.attachments && event.data.attachments.length > 0) {
+      return event.data.attachments.map(att => ({
+        filename: att.filename,
+        contentType: att.content_type,
+        content: Buffer.from(att.content, 'base64'),
+        size: Buffer.from(att.content, 'base64').length,
+      }));
+    }
+
+    // Otherwise fetch and parse the raw email
+    try {
+      const { downloadUrl } = await this.resendClient.getEmail(emailId);
+      const rawEmail = await this.resendClient.downloadRawEmail(downloadUrl);
+      const parsed = await this.resendClient.parseEmail(rawEmail);
+      return parsed.attachments;
+    } catch (error) {
+      logger.warn('Failed to fetch raw email for attachments', {
+        emailId,
+        error: error instanceof Error ? error.message : String(error),
+      });
+      return [];
+    }
+  }
+
+  /**
+   * Filter attachments by supported type and size
+   */
+  private filterAttachments(attachments: ParsedEmailAttachment[]): ParsedEmailAttachment[] {
+    return attachments.filter(att => {
+      if (!SUPPORTED_ATTACHMENT_TYPES.has(att.contentType)) {
+        logger.info('Skipping unsupported attachment type', {
+          filename: att.filename,
+          contentType: att.contentType,
+        });
+        return false;
+      }
+
+      if (att.size > MAX_ATTACHMENT_SIZE) {
+        logger.info('Skipping oversized attachment', {
+          filename: att.filename,
+          size: att.size,
+          maxSize: MAX_ATTACHMENT_SIZE,
+        });
+        return false;
+      }
+
+      return true;
+    });
+  }
+
+  // ========================
+  // OCR Processing
+  // ========================
+
+  /**
+   * Process attachments using classifier-driven OCR extraction.
+   * If email text classification is confident, calls the specific OCR endpoint.
+   * If not, performs general OCR and classifies from rawText.
+   * Returns null if no usable result or receipt is unclassified.
+   */
+  private async processAttachmentsWithClassification(
+    userId: string,
+    attachments: ParsedEmailAttachment[],
+    emailClassification: { type: string; confidence: number },
+    emailId: string
+  ): Promise<{ response: ReceiptExtractionResponse; recordType: EmailRecordType } | null> {
+    const imageAttachments = attachments.filter(att => OCR_RECEIPT_IMAGE_TYPES.has(att.contentType));
+
+    for (const attachment of imageAttachments) {
+      // If email text gave a confident classification, call the specific OCR endpoint first
+      if (emailClassification.type === 'fuel') {
+        const result = await this.extractFuelReceipt(userId, attachment);
+        if (result?.success) return { response: result, recordType: 'fuel_log' };
+        // Fuel OCR failed, try maintenance as fallback
+        const fallbackResult = await this.extractMaintenanceReceipt(userId, attachment);
+        if (fallbackResult?.success) return { response: fallbackResult, recordType: 'maintenance_record' };
+        continue;
+      }
+
+      if (emailClassification.type === 'maintenance') {
+        const result = await this.extractMaintenanceReceipt(userId, attachment);
+        if (result?.success) return { response: result, recordType: 'maintenance_record' };
+        // Maintenance OCR failed, try fuel as fallback
+        const fallbackResult = await this.extractFuelReceipt(userId, attachment);
+        if (fallbackResult?.success) return { response: fallbackResult, recordType: 'fuel_log' };
+        continue;
+      }
+
+      // Email text was not confident - try both OCR endpoints and classify from rawText
+      const fuelResult = await this.extractFuelReceipt(userId, attachment);
+      const maintenanceResult = await this.extractMaintenanceReceipt(userId, attachment);
+
+      // Use rawText from whichever succeeded for secondary classification
+      const rawText = fuelResult?.rawText || maintenanceResult?.rawText || '';
+      if (rawText) {
+        const ocrClassification = this.classifier.classifyFromOcrRawText(rawText);
+        logger.info('OCR rawText classification result', {
+          emailId,
+          type: ocrClassification.type,
+          confidence: ocrClassification.confidence,
+        });
+
+        if (ocrClassification.type === 'fuel' && fuelResult?.success) {
+          return { response: fuelResult, recordType: 'fuel_log' };
+        }
+        if (ocrClassification.type === 'maintenance' && maintenanceResult?.success) {
+          return { response: maintenanceResult, recordType: 'maintenance_record' };
+        }
+      }
+
+      // Both classifiers failed - fall back to field-count heuristic
+      const fallback = this.selectBestResultByFields(fuelResult, maintenanceResult);
+      if (fallback) return fallback;
+    }
+
+    return null;
+  }
+
+  /**
+   * Extract fuel receipt via OCR. Returns null on failure.
+   */
+  private async extractFuelReceipt(
+    userId: string,
+    attachment: ParsedEmailAttachment
+  ): Promise<ReceiptExtractionResponse | null> {
+    try {
+      return await ocrService.extractReceipt(userId, {
+        fileBuffer: attachment.content,
+        contentType: attachment.contentType,
+        receiptType: 'fuel',
+      });
+    } catch (error) {
+      logger.info('Fuel receipt extraction failed', {
+        filename: attachment.filename,
+        error: error instanceof Error ? error.message : String(error),
+      });
+      return null;
+    }
+  }
+
+  /**
+   * Extract maintenance receipt via OCR. Returns null on failure.
+   */
+  private async extractMaintenanceReceipt(
+    userId: string,
+    attachment: ParsedEmailAttachment
+  ): Promise<ReceiptExtractionResponse | null> {
+    try {
+      return await ocrService.extractMaintenanceReceipt(userId, {
+        fileBuffer: attachment.content,
+        contentType: attachment.contentType,
+      });
+    } catch (error) {
+      logger.info('Maintenance receipt extraction failed', {
+        filename: attachment.filename,
+        error: error instanceof Error ? error.message : String(error),
+      });
+      return null;
+    }
+  }
+
+  /**
+   * Last-resort fallback: select the better OCR result based on domain-specific
+   * fields and field count when keyword classifiers could not decide.
+   */
+  private selectBestResultByFields(
+    fuelResult: ReceiptExtractionResponse | null,
+    maintenanceResult: ReceiptExtractionResponse | null
+  ): { response: ReceiptExtractionResponse; recordType: EmailRecordType } | null {
+    const fuelFieldCount = fuelResult?.success
+      ? Object.keys(fuelResult.extractedFields).length
+      : 0;
+    const maintenanceFieldCount = maintenanceResult?.success
+      ? Object.keys(maintenanceResult.extractedFields).length
+      : 0;
+
+    if (fuelFieldCount === 0 && maintenanceFieldCount === 0) {
+      return null;
+    }
+
+    const hasFuelFields = fuelResult?.extractedFields['gallons'] ||
+      fuelResult?.extractedFields['price_per_gallon'] ||
+      fuelResult?.extractedFields['fuel_type'];
+
+    const hasMaintenanceFields = maintenanceResult?.extractedFields['category'] ||
+      maintenanceResult?.extractedFields['shop_name'] ||
+      maintenanceResult?.extractedFields['description'];
+
+    if (hasFuelFields && !hasMaintenanceFields) {
+      return { response: fuelResult!, recordType: 'fuel_log' };
+    }
+    if (hasMaintenanceFields && !hasFuelFields) {
+      return { response: maintenanceResult!, recordType: 'maintenance_record' };
+    }
+
+    if (fuelFieldCount >= maintenanceFieldCount && fuelResult?.success) {
+      return { response: fuelResult, recordType: 'fuel_log' };
+    }
+    if (maintenanceResult?.success) {
+      return { response: maintenanceResult, recordType: 'maintenance_record' };
+    }
+
+    return null;
+  }
+
+  /**
+   * Map OCR extracted fields to our ExtractedReceiptData format
+   */
+  private mapOcrToExtractedData(response: ReceiptExtractionResponse): ExtractedReceiptData {
+    const fields = response.extractedFields;
+    const getFieldValue = (key: string): string | null =>
+      fields[key]?.value || null;
+    const getFieldNumber = (key: string): number | null => {
+      const val = fields[key]?.value;
+      if (!val) return null;
+      const num = parseFloat(val);
+      return isNaN(num) ? null : num;
+    };
+
+    return {
+      vendor: getFieldValue('vendor') || getFieldValue('shop_name'),
+      date: getFieldValue('date'),
+      total: getFieldNumber('total'),
+      odometerReading: getFieldNumber('odometer') || getFieldNumber('odometer_reading'),
+      gallons: getFieldNumber('gallons'),
+      pricePerGallon: getFieldNumber('price_per_gallon'),
+      fuelType: getFieldValue('fuel_type'),
+      category: getFieldValue('category'),
+      subtypes: fields['subtypes']?.value ? fields['subtypes'].value.split(',').map(s => s.trim()) : null,
+      shopName: getFieldValue('shop_name'),
+      description: getFieldValue('description'),
+    };
+  }
+
+  // ========================
+  // Vehicle Association
+  // ========================
+
+  /**
+   * Handle vehicle association based on user's vehicle count.
+   * No vehicles: send error email.
+   * Single vehicle: auto-associate and create record.
+   * Multiple vehicles: create pending association for user selection.
+   */
+  private async handleVehicleAssociation(
+    userId: string,
+    userName: string,
+    userEmail: string,
+    recordType: EmailRecordType,
+    extractedData: ExtractedReceiptData
+  ): Promise<EmailProcessingResult> {
+    const vehicles = await this.vehiclesRepository.findByUserId(userId);
+
+    // No vehicles: user must add a vehicle first
+    if (vehicles.length === 0) {
+      await this.notificationHandler.notifyNoVehicles(userId, userName, userEmail);
+      return {
+        recordType,
+        vehicleId: null,
+        recordId: null,
+        documentId: null,
+        pendingAssociationId: null,
+        extractedData,
+      };
+    }
+
+    // Single vehicle: auto-associate and create record
+    if (vehicles.length === 1) {
+      const vehicle = vehicles[0];
+      let recordId: string | null = null;
+
+      try {
+        recordId = await this.createRecord(userId, vehicle.id, recordType, extractedData);
+      } catch (error) {
+        logger.error('Failed to create record from email receipt', {
+          userId,
+          vehicleId: vehicle.id,
+          recordType,
+          error: error instanceof Error ? error.message : String(error),
+        });
+      }
+
+      const vehicleName = vehicle.nickname
+        || [vehicle.year, vehicle.make, vehicle.model].filter(Boolean).join(' ')
+        || 'your vehicle';
+
+      await this.notificationHandler.notifyReceiptProcessed({
+        userId,
+        userName,
+        userEmail,
+        vehicleName,
+        recordType,
+        recordId,
+        vehicleId: vehicle.id,
+        extractedData,
+      });
+
+      return {
+        recordType,
+        vehicleId: vehicle.id,
+        recordId,
+        documentId: null,
+        pendingAssociationId: null,
+        extractedData,
+      };
+    }
+
+    // Multiple vehicles: create pending association for user selection
+    const pendingAssociation = await this.repository.insertPendingAssociation({
+      userId,
+      recordType,
+      extractedData,
+      documentId: null,
+    });
+
+    await this.notificationHandler.notifyPendingVehicleSelection({
+      userId,
+      userName,
+      userEmail,
+      recordType,
+      pendingAssociationId: pendingAssociation.id,
+      extractedData,
+    });
+
+    return {
+      recordType,
+      vehicleId: null,
+      recordId: null,
+      documentId: null,
+      pendingAssociationId: pendingAssociation.id,
+      extractedData,
+    };
+  }
+
+  // ========================
+  // Public Resolution API
+  // ========================
+
+  /**
+   * Resolve a pending vehicle association by creating the record with the selected vehicle.
+   * Called from the user-facing API when a multi-vehicle user picks a vehicle.
+   */
+  async resolveAssociation(
+    associationId: string,
+    vehicleId: string,
+    userId: string
+  ): Promise<{ recordId: string; recordType: EmailRecordType }> {
+    const association = await this.repository.getPendingAssociationById(associationId);
+    if (!association) {
+      throw new Error('Pending association not found');
+    }
+    if (association.userId !== userId) {
+      throw new Error('Unauthorized');
+    }
+    if (association.status !== 'pending') {
+      throw new Error('Association already resolved');
+    }
+
+    // Verify vehicle belongs to user
+    const vehicles = await this.vehiclesRepository.findByUserId(userId);
+    const vehicle = vehicles.find(v => v.id === vehicleId);
+    if (!vehicle) {
+      throw new Error('Vehicle not found');
+    }
+
+    // Create the record
+    const recordId = await this.createRecord(userId, vehicleId, association.recordType, association.extractedData);
+
+    // Mark as resolved
+    await this.repository.resolvePendingAssociation(associationId, 'resolved');
+
+    logger.info('Pending association resolved', { associationId, vehicleId, userId, recordType: association.recordType, recordId });
+
+    return { recordId, recordType: association.recordType };
+  }
+
+  /**
+   * Dismiss a pending vehicle association without creating a record.
+   */
+  async dismissAssociation(associationId: string, userId: string): Promise<void> {
+    const association = await this.repository.getPendingAssociationById(associationId);
+    if (!association) {
+      throw new Error('Pending association not found');
+    }
+    if (association.userId !== userId) {
+      throw new Error('Unauthorized');
+    }
+    if (association.status !== 'pending') {
+      throw new Error('Association already resolved');
+    }
+
+    await this.repository.resolvePendingAssociation(associationId, 'expired');
+    logger.info('Pending association dismissed', { associationId, userId });
+  }
+
+  // ========================
+  // Record Creation
+  // ========================
+
+  /**
+   * Create a fuel log or maintenance record from extracted receipt data.
+   * Returns the created record ID.
+   */
+  private async createRecord(
+    userId: string,
+    vehicleId: string,
+    recordType: EmailRecordType,
+    extractedData: ExtractedReceiptData
+  ): Promise<string> {
+    if (recordType === 'fuel_log') {
+      return this.createFuelLogRecord(userId, vehicleId, extractedData);
+    }
+    return this.createMaintenanceRecord(userId, vehicleId, extractedData);
+  }
+
+  /**
+   * Map extracted receipt data to EnhancedCreateFuelLogRequest and create fuel log.
+   */
+  private async createFuelLogRecord(
+    userId: string,
+    vehicleId: string,
+    data: ExtractedReceiptData
+  ): Promise<string> {
+    const fuelUnits = data.gallons ?? 0;
+    const costPerUnit = data.pricePerGallon ?? (data.total && fuelUnits > 0 ? data.total / fuelUnits : 0);
+
+    const request: EnhancedCreateFuelLogRequest = {
+      vehicleId,
+      dateTime: data.date || new Date().toISOString(),
+      fuelType: this.mapFuelType(data.fuelType),
+      fuelUnits,
+      costPerUnit,
+      odometerReading: data.odometerReading ?? undefined,
+      locationData: data.vendor ? { stationName: data.vendor } : undefined,
+      notes: 'Created from emailed receipt',
+    };
+
+    logger.info('Creating fuel log from email receipt', { userId, vehicleId, fuelUnits, costPerUnit });
+    const result = await this.fuelLogsService.createFuelLog(request, userId);
+    return result.id;
+  }
+
+  /**
+   * Map extracted receipt data to CreateMaintenanceRecordRequest and create maintenance record.
+   */
+  private async createMaintenanceRecord(
+    userId: string,
+    vehicleId: string,
+    data: ExtractedReceiptData
+  ): Promise<string> {
+    const category = this.mapMaintenanceCategory(data.category);
+    const subtypes = this.resolveMaintenanceSubtypes(category, data.subtypes);
+
+    const record = await this.maintenanceService.createRecord(userId, {
+      vehicleId,
+      category,
+      subtypes,
+      date: data.date || new Date().toISOString().split('T')[0],
+      odometerReading: data.odometerReading ?? undefined,
+      cost: data.total ?? undefined,
+      shopName: data.shopName || data.vendor || undefined,
+      notes: data.description
+        ? `${data.description}\n\nCreated from emailed receipt`
+        : 'Created from emailed receipt',
+    });
+
+    logger.info('Created maintenance record from email receipt', { userId, vehicleId, recordId: record.id, category });
+    return record.id;
+  }
+
+  /**
+   * Map OCR fuel type string to FuelType enum. Defaults to gasoline.
+   */
+  private mapFuelType(fuelTypeStr: string | null): FuelType {
+    if (!fuelTypeStr) return FuelType.GASOLINE;
+
+    const normalized = fuelTypeStr.toLowerCase().trim();
+    if (normalized.includes('diesel') || normalized === '#1' || normalized === '#2') {
+      return FuelType.DIESEL;
+    }
+    if (normalized.includes('electric') || normalized.includes('ev')) {
+      return FuelType.ELECTRIC;
+    }
+    return FuelType.GASOLINE;
+  }
+
+  /**
+   * Map OCR category string to MaintenanceCategory. Defaults to routine_maintenance.
+   */
+  private mapMaintenanceCategory(categoryStr: string | null): MaintenanceCategory {
+    if (!categoryStr) return 'routine_maintenance';
+
+    const normalized = categoryStr.toLowerCase().trim();
+    if (normalized.includes('repair')) return 'repair';
+    if (normalized.includes('performance') || normalized.includes('upgrade')) return 'performance_upgrade';
+    return 'routine_maintenance';
+  }
+
+  /**
+   * Validate and resolve maintenance subtypes. Falls back to first valid
+   * subtype for the category if OCR subtypes are invalid or missing.
+   */
+  private resolveMaintenanceSubtypes(
+    category: MaintenanceCategory,
+    ocrSubtypes: string[] | null
+  ): string[] {
+    if (ocrSubtypes && ocrSubtypes.length > 0 && validateSubtypes(category, ocrSubtypes)) {
+      return ocrSubtypes;
+    }
+
+    // Attempt to match OCR subtypes against valid options (case-insensitive)
+    if (ocrSubtypes && ocrSubtypes.length > 0) {
+      const validOptions = getSubtypesForCategory(category);
+      const matched = ocrSubtypes
+        .map(s => validOptions.find(v => v.toLowerCase() === s.toLowerCase().trim()))
+        .filter((v): v is string => v !== undefined);
+      if (matched.length > 0) return matched;
+    }
+
+    // Default to first subtype of category
+    const defaults = getSubtypesForCategory(category);
+    return [defaults[0] as string];
+  }
+
+  // ========================
+  // Error Handling & Retries
+  // ========================
+
+  private async handleProcessingError(
+    emailId: string,
+    senderEmail: string,
+    _subject: string | null,
+    error: unknown
+  ): Promise<void> {
+    const errorMessage = error instanceof Error ? error.message : String(error);
+    logger.error('Email processing pipeline error', { emailId, error: errorMessage });
+
+    // Get current queue entry for retry count and userId
+    const queueEntry = await this.repository.getQueueEntry(emailId);
+    const currentRetryCount = queueEntry?.retryCount || 0;
+    const newRetryCount = currentRetryCount + 1;
+
+    if (newRetryCount < MAX_RETRY_COUNT) {
+      // Mark for retry
+      await this.repository.updateQueueStatus(emailId, 'failed', {
+        errorMessage,
+        retryCount: newRetryCount,
+      });
+
+      logger.info('Email queued for retry', {
+        emailId,
+        retryCount: newRetryCount,
+        maxRetries: MAX_RETRY_COUNT,
+      });
+    } else {
+      // Max retries exceeded - permanently failed
+      await this.repository.updateQueueStatus(emailId, 'failed', {
+        errorMessage: `Max retries (${MAX_RETRY_COUNT}) exceeded. Last error: ${errorMessage}`,
+        retryCount: newRetryCount,
+      });
+
+      // Send failure notification (email + in-app if userId available)
+      await this.notificationHandler.notifyProcessingFailure({
+        userId: queueEntry?.userId,
+        userEmail: senderEmail,
+        errorReason: errorMessage,
+      }).catch(notifyErr => {
+        logger.error('Failed to send failure notification', {
+          emailId,
+          error: notifyErr instanceof Error ? notifyErr.message : String(notifyErr),
+        });
+      });
+    }
+  }
+
+  private async handleUnregisteredSender(
+    emailId: string,
+    senderEmail: string
+  ): Promise<void> {
+    logger.info('Unregistered sender rejected', { emailId, senderEmail });
+
+    await this.repository.updateQueueStatus(emailId, 'failed', {
+      errorMessage: 'Sender email is not registered with MotoVaultPro',
+    });
+
+    await this.notificationHandler.notifyUnregisteredSender(senderEmail).catch(error => {
+      logger.error('Failed to send unregistered sender notification', {
+        emailId,
+        error: error instanceof Error ? error.message : String(error),
+      });
+    });
+  }
+
+  private async handleNoValidAttachments(
+    emailId: string,
+    userId: string,
+    userName: string,
+    userEmail: string
+  ): Promise<void> {
+    logger.info('No valid attachments found', { emailId });
+
+    await this.repository.updateQueueStatus(emailId, 'failed', {
+      errorMessage: 'No valid attachments found. Supported types: PDF, PNG, JPG, JPEG, HEIC (max 10MB each)',
+    });
+
+    await this.notificationHandler.notifyNoValidAttachments(userId, userName, userEmail).catch(error => {
+      logger.error('Failed to send no-attachments notification', {
+        emailId,
+        error: error instanceof Error ? error.message : String(error),
+      });
+    });
+  }
+
+  private async handleOcrFailure(
+    emailId: string,
+    userId: string,
+    userName: string,
+    userEmail: string,
+    reason: string
+  ): Promise<void> {
+    logger.info('OCR extraction failed for all attachments', { emailId, reason });
+
+    await this.repository.updateQueueStatus(emailId, 'failed', {
+      errorMessage: reason,
+    });
+
+    await this.notificationHandler.notifyOcrFailure(userId, userName, userEmail, reason).catch(error => {
+      logger.error('Failed to send OCR failure notification', {
+        emailId,
+        error: error instanceof Error ? error.message : String(error),
+      });
+    });
+  }
+}
--- a/Show More
+++ b/Show More