diff --git a/.ai/context.json b/.ai/context.json
index 1b5edf4..c343144 100644
--- a/.ai/context.json
+++ b/.ai/context.json
@@ -115,12 +115,29 @@
       "description": "Admin role management, platform catalog CRUD, station oversight",
       "status": "implemented"
     },
-    "vehicles": {
-      "path": "backend/src/features/vehicles/",
+    "auth": {
+      "path": "backend/src/features/auth/",
       "type": "core_feature",
       "self_contained": true,
-      "database_tables": ["vehicles"],
-      "cache_strategy": "User vehicle lists: 5 minutes",
+      "database_tables": [],
+      "description": "User signup, email verification workflow using Auth0",
+      "status": "implemented"
+    },
+    "backup": {
+      "path": "backend/src/features/backup/",
+      "type": "admin_feature",
+      "self_contained": true,
+      "database_tables": ["backup_schedules", "backup_history", "backup_settings"],
+      "storage": "/app/data/backups/",
+      "description": "Manual and scheduled database/document backups with retention policies",
+      "status": "implemented"
+    },
+    "documents": {
+      "path": "backend/src/features/documents/",
+      "type": "independent_feature",
+      "self_contained": true,
+      "database_tables": ["documents"],
+      "storage": "/app/data/documents/",
       "status": "implemented"
     },
     "fuel-logs": {
@@ -141,21 +158,23 @@
       "cache_strategy": "Upcoming maintenance: 1 hour",
       "status": "implemented"
     },
-    "stations": {
-      "path": "backend/src/features/stations/",
-      "type": "independent_feature",
+    "notifications": {
+      "path": "backend/src/features/notifications/",
+      "type": "dependent_feature",
       "self_contained": true,
-      "external_apis": ["Google Maps API"],
-      "database_tables": ["stations", "community_stations"],
-      "cache_strategy": "Station searches: 1 hour",
+      "depends_on": ["maintenance", "documents"],
+      "database_tables": ["email_templates", "notification_logs", "sent_notification_tracker", "user_notifications"],
+      "external_apis": ["Resend"],
+      "description": "Email and toast notifications for maintenance due/overdue and expiring documents",
       "status": "implemented"
     },
-    "documents": {
-      "path": "backend/src/features/documents/",
-      "type": "independent_feature",
+    "onboarding": {
+      "path": "backend/src/features/onboarding/",
+      "type": "dependent_feature",
       "self_contained": true,
-      "database_tables": ["documents"],
-      "storage": "/app/data/documents/",
+      "depends_on": ["user-profile", "user-preferences"],
+      "database_tables": [],
+      "description": "User onboarding flow after email verification (preferences, first vehicle)",
       "status": "implemented"
     },
     "platform": {
@@ -166,11 +185,61 @@
       "cache_strategy": "Vehicle hierarchical data: 6 hours",
       "description": "Vehicle hierarchical data lookups (years, makes, models, trims, engines). VIN decoding is planned/future.",
       "status": "implemented_vin_decode_planned"
+    },
+    "stations": {
+      "path": "backend/src/features/stations/",
+      "type": "independent_feature",
+      "self_contained": true,
+      "external_apis": ["Google Maps API"],
+      "database_tables": ["stations", "community_stations"],
+      "cache_strategy": "Station searches: 1 hour",
+      "status": "implemented"
+    },
+    "terms-agreement": {
+      "path": "backend/src/features/terms-agreement/",
+      "type": "core_feature",
+      "self_contained": true,
+      "database_tables": ["terms_agreements"],
+      "description": "Legal audit trail for Terms & Conditions acceptance at signup",
+      "status": "implemented"
+    },
+    "user-export": {
+      "path": "backend/src/features/user-export/",
+      "type": "independent_feature",
+      "self_contained": true,
+      "depends_on": ["vehicles", "fuel-logs", "documents", "maintenance"],
+      "database_tables": [],
+      "description": "GDPR-compliant user data export (vehicles, logs, documents as TAR.GZ)",
+      "status": "implemented"
+    },
+    "user-preferences": {
+      "path": "backend/src/features/user-preferences/",
+      "type": "core_feature",
+      "self_contained": true,
+      "database_tables": ["user_preferences"],
+      "description": "User preference management (unit system, currency, timezone)",
+      "status": "implemented"
+    },
+    "user-profile": {
+      "path": "backend/src/features/user-profile/",
+      "type": "core_feature",
+      "self_contained": true,
+      "database_tables": ["user_profiles"],
+      "description": "User profile management (email, display name, notification email)",
+      "status": "implemented"
+    },
+    "vehicles": {
+      "path": "backend/src/features/vehicles/",
+      "type": "core_feature",
+      "self_contained": true,
+      "database_tables": ["vehicles"],
+      "cache_strategy": "User vehicle lists: 5 minutes",
+      "status": "implemented"
     }
   },
   "feature_dependencies": {
     "explanation": "Logical dependencies within single application service - all deploy together",
-    "sequence": ["admin", "platform", "vehicles", "fuel-logs", "maintenance", "stations", "documents"]
+    "sequence": ["admin", "auth", "user-profile", "user-preferences", "terms-agreement", "onboarding", "platform", "vehicles", "fuel-logs", "maintenance", "stations", "documents", "notifications", "backup", "user-export"]
   },
   "development_environment": {
     "type": "production_only_docker",
@@ -206,7 +275,8 @@
     },
     "external_apis": [
       "Google Maps API",
-      "Auth0"
+      "Auth0",
+      "Resend"
     ]
   },
   "network_topology": {
diff --git a/backend/src/features/user-preferences/README.md b/backend/src/features/user-preferences/README.md
new file mode 100644
index 0000000..fe60eea
--- /dev/null
+++ b/backend/src/features/user-preferences/README.md
@@ -0,0 +1,135 @@
+# User Preferences Feature
+
+User preference management for unit system, currency, timezone, and dark mode settings.
+
+## Overview
+
+This feature provides API endpoints for retrieving and updating user preferences. Preferences are automatically created with defaults on first access.
+
+## Architecture
+
+- **API Layer**: Routes and controller for HTTP request/response handling
+- **Core Integration**: Uses shared `core/user-preferences/` for repository and types
+- **Auto-Creation**: Default preferences created on first GET if none exist
+
+## API Endpoints
+
+### GET /api/user/preferences (Protected)
+Retrieve user preferences. Creates default preferences if none exist.
+
+**Authentication:** Requires JWT
+
+**Response (200 OK):**
+```json
+{
+  "id": "uuid",
+  "userId": "auth0|123456",
+  "unitSystem": "imperial",
+  "currencyCode": "USD",
+  "timeZone": "UTC",
+  "darkMode": null,
+  "createdAt": "2025-01-01T00:00:00.000Z",
+  "updatedAt": "2025-01-01T00:00:00.000Z"
+}
+```
+
+**Error Responses:**
+- 401: Unauthorized (no JWT or invalid JWT)
+- 500: Database error
+
+---
+
+### PUT /api/user/preferences (Protected)
+Update user preferences. Creates preferences if none exist.
+
+**Authentication:** Requires JWT
+
+**Request:**
+```json
+{
+  "unitSystem": "metric",
+  "currencyCode": "EUR",
+  "timeZone": "America/New_York",
+  "darkMode": true
+}
+```
+
+All fields are optional. Only provided fields are updated.
+
+**Validation:**
+- `unitSystem`: Must be `"imperial"` or `"metric"`
+- `currencyCode`: Must be a 3-letter ISO currency code (e.g., `"USD"`, `"EUR"`)
+- `timeZone`: IANA timezone string (e.g., `"America/New_York"`)
+- `darkMode`: Boolean or `null` (null = system default)
+
+**Response (200 OK):**
+```json
+{
+  "id": "uuid",
+  "userId": "auth0|123456",
+  "unitSystem": "metric",
+  "currencyCode": "EUR",
+  "timeZone": "America/New_York",
+  "darkMode": true,
+  "createdAt": "2025-01-01T00:00:00.000Z",
+  "updatedAt": "2025-01-01T12:00:00.000Z"
+}
+```
+
+**Error Responses:**
+- 400: Invalid unitSystem, currencyCode, or darkMode value
+- 401: Unauthorized (no JWT or invalid JWT)
+- 500: Database error
+
+## Default Values
+
+When preferences are auto-created:
+- `unitSystem`: `"imperial"`
+- `currencyCode`: `"USD"`
+- `timeZone`: `"UTC"`
+- `darkMode`: `null` (system default)
+
+## Integration Points
+
+- **Core User Preferences**: Shared repository and types in `core/user-preferences/`
+- **Database**: `user_preferences` table
+- **Auth**: JWT authentication via Fastify auth plugin
+- **Onboarding**: Preferences set during user onboarding flow
+
+## Testing
+
+### Unit Tests
+Location: `tests/unit/`
+
+Tests controller logic with mocked repository:
+- Get preferences with and without existing record
+- Update preferences with valid and invalid inputs
+- Validation error handling
+
+Run tests:
+```bash
+npm test -- features/user-preferences
+```
+
+## Dependencies
+
+- UserPreferencesRepository (`core/user-preferences/data/user-preferences.repository.ts`)
+- Core logger (`core/logging/logger.ts`)
+- Database pool (`core/config/database.ts`)
+
+## Database Table
+
+Table: `user_preferences`
+
+| Column | Type | Description |
+|--------|------|-------------|
+| id | UUID | Primary key |
+| user_id | VARCHAR(255) | Auth0 user ID (unique) |
+| unit_system | VARCHAR(20) | `imperial` or `metric` |
+| currency_code | VARCHAR(3) | ISO currency code |
+| time_zone | VARCHAR(100) | IANA timezone |
+| dark_mode | BOOLEAN | Dark mode preference (nullable) |
+| created_at | TIMESTAMP | Creation timestamp |
+| updated_at | TIMESTAMP | Last update timestamp |
+
+See `docs/DATABASE-SCHEMA.md` for complete schema details.
diff --git a/docs/ARCHITECTURE-OVERVIEW.md b/docs/ARCHITECTURE-OVERVIEW.md
index baf01a4..55af73c 100644
--- a/docs/ARCHITECTURE-OVERVIEW.md
+++ b/docs/ARCHITECTURE-OVERVIEW.md
@@ -240,12 +240,21 @@ Features are **self-contained modules** within the backend service at `backend/s
 
 ```
 backend/src/features/
-├── vehicles/          # Vehicle management
-├── fuel-logs/         # Fuel tracking
-├── maintenance/       # Service records
-├── stations/          # Gas station locations
+├── admin/             # Admin role management
+├── auth/              # User authentication
+├── backup/            # Database backup/restore
 ├── documents/         # Document storage
-└── platform/          # Vehicle data + VIN decoding
+├── fuel-logs/         # Fuel tracking
+├── maintenance/       # Service records and schedules
+├── notifications/     # Email and toast notifications
+├── onboarding/        # User onboarding flow
+├── platform/          # Vehicle data + VIN decoding
+├── stations/          # Gas station locations
+├── terms-agreement/   # T&C acceptance audit
+├── user-export/       # GDPR data export
+├── user-preferences/  # User settings
+├── user-profile/      # User profile management
+└── vehicles/          # Vehicle management
 ```
 
 ### Feature Structure
@@ -262,13 +271,30 @@ feature-name/
 └── external/          # External service integrations (optional)
 ```
 
-### Current Features
+### Current Features (15)
 
-#### Vehicles
-- **Purpose**: Vehicle inventory management
-- **Tables**: `vehicles` (user-scoped)
-- **Integration**: Platform service for make/model/trim data
-- **Endpoints**: CRUD + dropdown data
+#### Admin
+- **Purpose**: Admin role management and oversight
+- **Tables**: `admin_users`, `admin_audit_logs`
+- **Endpoints**: Admin CRUD, catalog management, station oversight
+
+#### Auth
+- **Purpose**: User authentication and signup
+- **Tables**: None (uses Auth0)
+- **Integration**: Auth0 for identity management
+- **Endpoints**: Signup, verify email, resend verification
+
+#### Backup
+- **Purpose**: Database and document backup/restore
+- **Tables**: `backup_schedules`, `backup_history`, `backup_settings`
+- **Storage**: `/app/data/backups/`
+- **Endpoints**: Admin backup CRUD, restore, schedules
+
+#### Documents
+- **Purpose**: Document storage and retrieval
+- **Tables**: `documents` (user-scoped)
+- **Storage**: Filesystem (`/app/data/documents/`)
+- **Endpoints**: Upload + download + delete
 
 #### Fuel Logs
 - **Purpose**: Fuel purchase and efficiency tracking
@@ -278,21 +304,61 @@ feature-name/
 
 #### Maintenance
 - **Purpose**: Service and maintenance record tracking
-- **Tables**: `maintenance_records` (user-scoped)
-- **Integration**: Vehicles feature for vehicle data
-- **Endpoints**: CRUD + reminders
+- **Tables**: `maintenance_logs`, `maintenance_schedules` (user-scoped)
+- **Integration**: Vehicles feature, notifications
+- **Endpoints**: CRUD + schedules + reminders
+
+#### Notifications
+- **Purpose**: Email and toast notifications
+- **Tables**: `email_templates`, `notification_logs`
+- **Integration**: Resend API for email delivery
+- **Endpoints**: User summary, admin template management
+
+#### Onboarding
+- **Purpose**: User onboarding after signup
+- **Tables**: Uses `user_profiles`, `user_preferences`
+- **Integration**: User profile and preferences features
+- **Endpoints**: Preferences, complete, status
+
+#### Platform
+- **Purpose**: Vehicle data and VIN decoding
+- **Tables**: `engines`, `transmissions`, `vehicle_options`
+- **Integration**: Backend dropdown cascade queries
+- **Endpoints**: Years, makes, models, trims, engines
 
 #### Stations
 - **Purpose**: Gas station location and pricing
-- **Tables**: `stations` (user-scoped)
+- **Tables**: `stations`, `community_stations`
 - **Integration**: Google Maps API
-- **Endpoints**: Search + favorites
+- **Endpoints**: Search + favorites + community reports
 
-#### Documents
-- **Purpose**: Document storage and retrieval
-- **Tables**: `documents` (user-scoped)
-- **Storage**: Filesystem (`/app/data/documents/`)
-- **Endpoints**: Upload + download + delete
+#### Terms Agreement
+- **Purpose**: Legal audit trail for T&C acceptance
+- **Tables**: `terms_agreements`
+- **Integration**: Created during signup flow
+- **Endpoints**: None (internal use)
+
+#### User Export
+- **Purpose**: GDPR-compliant data export
+- **Tables**: None (reads from all user data)
+- **Storage**: Temporary TAR.GZ archives
+- **Endpoints**: Export download
+
+#### User Preferences
+- **Purpose**: User preference management
+- **Tables**: `user_preferences` (user-scoped)
+- **Endpoints**: GET/PUT preferences
+
+#### User Profile
+- **Purpose**: User profile management
+- **Tables**: `user_profiles` (user-scoped)
+- **Endpoints**: GET/PUT profile
+
+#### Vehicles
+- **Purpose**: Vehicle inventory management
+- **Tables**: `vehicles` (user-scoped)
+- **Integration**: Platform service for make/model/trim data
+- **Endpoints**: CRUD + dropdown data + images
 
 ## Data Flow
 
diff --git a/docs/CLAUDE.md b/docs/CLAUDE.md
index 4af9023..0a33a36 100644
--- a/docs/CLAUDE.md
+++ b/docs/CLAUDE.md
@@ -19,8 +19,3 @@
 | `MVP-COLOR-SCHEME.md` | Color scheme reference | UI styling decisions |
 | `UX-DEBUGGING.md` | UX debugging techniques | Debugging UI issues |
 
-## Subdirectories
-
-| Directory | What | When to read |
-| --------- | ---- | ------------ |
-| `changes/` | Change logs and migration notes | Understanding historical changes |
diff --git a/docs/DATABASE-SCHEMA.md b/docs/DATABASE-SCHEMA.md
index 4c65538..ced6224 100644
--- a/docs/DATABASE-SCHEMA.md
+++ b/docs/DATABASE-SCHEMA.md
@@ -1,23 +1,133 @@
 # Database Schema Overview
 
-Complete database schema for MotoVaultPro Modified Feature Capsule architecture.
+Complete database schema for MotoVaultPro 5-container architecture with 15 feature capsules.
 
 ## Migration System
 
 ### Migration Order (Dependencies)
-1. **vehicles** - Primary entity, no dependencies
-2. **fuel-logs** - Depends on vehicles (vehicle_id FK)
-3. **maintenance** - Depends on vehicles (vehicle_id FK)  
-4. **stations** - Independent feature
+1. **admin** - Admin users and audit logs, no dependencies
+2. **user-profile** - User profiles, no dependencies
+3. **user-preferences** - User preferences, depends on user-profile
+4. **terms-agreement** - Terms acceptance audit, no dependencies
+5. **platform** - Vehicle lookup data (engines, transmissions, vehicle_options)
+6. **vehicles** - Primary vehicle entity, no dependencies
+7. **fuel-logs** - Depends on vehicles (vehicle_id FK)
+8. **maintenance** - Depends on vehicles (vehicle_id FK)
+9. **stations** - Independent feature (includes community_stations)
+10. **documents** - Depends on vehicles (vehicle_id FK)
+11. **notifications** - Email templates and logs, depends on maintenance/documents
+12. **backup** - Backup schedules, history, settings
+
+Features without migrations: auth, onboarding, user-export
 
 ### Migration Tracking
 - **Table**: `_migrations`
 - **Purpose**: Tracks executed migration files to prevent re-execution
 - **Behavior**: Migration system is **idempotent at the file level** - will skip already executed files
-- **SQL Statement Level**: Individual SQL statements within files may fail on re-run if they don't use `IF NOT EXISTS` clauses
 - **Safety**: Safe to re-run the migration system; unsafe to manually re-run individual SQL files
 
-## Core Tables
+## Admin Tables
+
+### admin_users
+Admin role-based access control.
+
+```sql
+admin_users (
+  auth0_sub VARCHAR(255) PRIMARY KEY,
+  email VARCHAR(255) NOT NULL UNIQUE,
+  role VARCHAR(50) NOT NULL DEFAULT 'admin',
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+  created_by VARCHAR(255) NOT NULL,
+  revoked_at TIMESTAMP WITH TIME ZONE,
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Indexes**: email, created_at, revoked_at
+**Triggers**: auto-update updated_at
+
+### admin_audit_logs
+Audit trail for admin actions.
+
+```sql
+admin_audit_logs (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  actor_admin_id VARCHAR(255) NOT NULL,
+  target_admin_id VARCHAR(255),
+  action VARCHAR(100) NOT NULL,
+  resource_type VARCHAR(100),
+  resource_id VARCHAR(255),
+  context JSONB,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Indexes**: actor_admin_id, target_admin_id, action, created_at
+
+## User Tables
+
+### user_profiles
+User profile information with Auth0 integration.
+
+```sql
+user_profiles (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  auth0_sub VARCHAR(255) NOT NULL UNIQUE,
+  email VARCHAR(255) NOT NULL,
+  display_name VARCHAR(100),
+  notification_email VARCHAR(255),
+  email_verified BOOLEAN DEFAULT false,
+  onboarding_completed_at TIMESTAMP WITH TIME ZONE,
+  subscription_tier VARCHAR(50) DEFAULT 'free',
+  deactivated_at TIMESTAMP WITH TIME ZONE,
+  deletion_requested_at TIMESTAMP WITH TIME ZONE,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Indexes**: auth0_sub
+**Triggers**: auto-update updated_at
+
+### user_preferences
+User preference settings.
+
+```sql
+user_preferences (
+  id UUID PRIMARY KEY,
+  user_id VARCHAR(255) NOT NULL UNIQUE,
+  unit_system VARCHAR(20) DEFAULT 'imperial',
+  currency_code VARCHAR(3) DEFAULT 'USD',
+  time_zone VARCHAR(100) DEFAULT 'America/New_York',
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Indexes**: user_id
+
+### terms_agreements
+Legal audit trail for T&C acceptance.
+
+```sql
+terms_agreements (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  user_id VARCHAR(255) NOT NULL,
+  agreed_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  ip_address VARCHAR(45) NOT NULL,
+  user_agent TEXT NOT NULL,
+  terms_version VARCHAR(50) NOT NULL,
+  terms_url VARCHAR(255) NOT NULL,
+  terms_content_hash VARCHAR(64) NOT NULL,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Indexes**: user_id
+**Invariant**: One record per user, created at signup
+
+## Vehicle Tables
 
 ### vehicles
 Primary entity for all vehicle data.
@@ -26,44 +136,29 @@ Primary entity for all vehicle data.
 vehicles (
   id UUID PRIMARY KEY,
   user_id VARCHAR(255) NOT NULL,
-  vin VARCHAR(17) NOT NULL,
+  vin VARCHAR(17),
   make VARCHAR(100),
-  model VARCHAR(100), 
+  model VARCHAR(100),
   year INTEGER,
+  trim VARCHAR(100),
+  engine VARCHAR(100),
+  transmission VARCHAR(100),
   nickname VARCHAR(100),
   color VARCHAR(50),
   license_plate VARCHAR(20),
   odometer_reading INTEGER DEFAULT 0,
+  image_bucket VARCHAR(128),
+  image_key VARCHAR(512),
   is_active BOOLEAN DEFAULT true,
-  deleted_at TIMESTAMP WITH TIME ZONE, -- Soft delete
+  deleted_at TIMESTAMP WITH TIME ZONE,
   created_at TIMESTAMP WITH TIME ZONE,
-  updated_at TIMESTAMP WITH TIME ZONE,
-  
-  CONSTRAINT unique_user_vin UNIQUE(user_id, vin)
+  updated_at TIMESTAMP WITH TIME ZONE
 )
 ```
 
 **Indexes**: user_id, vin, is_active, created_at
-**Triggers**: auto-update updated_at column
-
-### vin_cache
-Caches NHTSA vPIC API responses for 30 days.
-
-```sql
-vin_cache (
-  vin VARCHAR(17) PRIMARY KEY,
-  make VARCHAR(100),
-  model VARCHAR(100),
-  year INTEGER,
-  engine_type VARCHAR(100),
-  body_type VARCHAR(100),
-  raw_data JSONB,
-  cached_at TIMESTAMP WITH TIME ZONE
-)
-```
-
-**Indexes**: cached_at (for cleanup)
-**TTL**: 30 days (application-managed)
+**Triggers**: auto-update updated_at
+**Constraints**: VIN nullable (license plate can be used instead)
 
 ### fuel_logs
 Tracks fuel purchases and efficiency metrics.
@@ -74,8 +169,8 @@ fuel_logs (
   user_id VARCHAR(255) NOT NULL,
   vehicle_id UUID NOT NULL REFERENCES vehicles(id) ON DELETE CASCADE,
   date_time TIMESTAMP WITH TIME ZONE NOT NULL,
-  odometer INTEGER,
-  trip_distance DECIMAL(10,2),
+  odometer NUMERIC,
+  trip_distance NUMERIC,
   fuel_type VARCHAR(50),
   fuel_grade VARCHAR(50),
   fuel_units DECIMAL(10,3) NOT NULL,
@@ -88,11 +183,92 @@ fuel_logs (
 )
 ```
 
-**Foreign Keys**: vehicle_id → vehicles.id (ON DELETE CASCADE)
+**Foreign Keys**: vehicle_id -> vehicles.id (ON DELETE CASCADE)
 **Indexes**: user_id, vehicle_id, date_time, created_at
 
+### maintenance_logs
+Completed maintenance records.
+
+```sql
+maintenance_logs (
+  id UUID PRIMARY KEY,
+  user_id VARCHAR(255) NOT NULL,
+  vehicle_id UUID NOT NULL REFERENCES vehicles(id) ON DELETE CASCADE,
+  category VARCHAR(50) NOT NULL,
+  subtypes TEXT[],
+  service_date DATE NOT NULL,
+  odometer INTEGER,
+  cost DECIMAL(10,2),
+  shop_name VARCHAR(200),
+  notes TEXT,
+  created_at TIMESTAMP WITH TIME ZONE,
+  updated_at TIMESTAMP WITH TIME ZONE
+)
+```
+
+**Foreign Keys**: vehicle_id -> vehicles.id (ON DELETE CASCADE)
+**Indexes**: user_id, vehicle_id, service_date
+
+### maintenance_schedules
+Recurring maintenance schedules with notification settings.
+
+```sql
+maintenance_schedules (
+  id UUID PRIMARY KEY,
+  user_id VARCHAR(255) NOT NULL,
+  vehicle_id UUID NOT NULL REFERENCES vehicles(id) ON DELETE CASCADE,
+  category VARCHAR(50) NOT NULL,
+  subtypes TEXT[],
+  interval_months INTEGER,
+  interval_miles INTEGER,
+  last_service_date DATE,
+  last_service_mileage INTEGER,
+  next_due_date DATE,
+  next_due_mileage INTEGER,
+  email_notifications BOOLEAN DEFAULT false,
+  notes TEXT,
+  created_at TIMESTAMP WITH TIME ZONE,
+  updated_at TIMESTAMP WITH TIME ZONE
+)
+```
+
+**Foreign Keys**: vehicle_id -> vehicles.id (ON DELETE CASCADE)
+**Indexes**: user_id, vehicle_id, next_due_date
+
+### documents
+Vehicle document storage (insurance, registration, etc.).
+
+```sql
+documents (
+  id UUID PRIMARY KEY,
+  user_id VARCHAR(255) NOT NULL,
+  vehicle_id UUID NOT NULL REFERENCES vehicles(id) ON DELETE CASCADE,
+  document_type VARCHAR(32) NOT NULL CHECK (document_type IN ('insurance','registration','manual')),
+  title VARCHAR(200) NOT NULL,
+  notes TEXT,
+  details JSONB,
+  storage_bucket VARCHAR(128),
+  storage_key VARCHAR(512),
+  file_name VARCHAR(255),
+  content_type VARCHAR(128),
+  file_size BIGINT,
+  file_hash VARCHAR(128),
+  issued_date DATE,
+  expiration_date DATE,
+  email_notifications BOOLEAN DEFAULT false,
+  created_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(),
+  deleted_at TIMESTAMP WITHOUT TIME ZONE
+)
+```
+
+**Foreign Keys**: vehicle_id -> vehicles.id (ON DELETE CASCADE)
+**Indexes**: user_id, vehicle_id, document_type, expiration_date
+
+## Station Tables
+
 ### stations
-Gas station locations and details.
+Gas station locations from Google Maps.
 
 ```sql
 stations (
@@ -104,51 +280,225 @@ stations (
   longitude DECIMAL(11,8),
   phone VARCHAR(20),
   website VARCHAR(255),
+  has_93_octane BOOLEAN,
+  photo_reference VARCHAR(500),
   created_at TIMESTAMP WITH TIME ZONE,
   updated_at TIMESTAMP WITH TIME ZONE
 )
 ```
 
 **External Source**: Google Maps Places API
-**Storage**: Persisted in PostgreSQL with station_cache table
 **Cache Strategy**: Postgres-based cache with TTL management
 
-### maintenance
-Vehicle maintenance records and scheduling.
+### community_stations
+User-reported station information.
 
 ```sql
-maintenance (
+community_stations (
   id UUID PRIMARY KEY,
+  station_id UUID REFERENCES stations(id),
   user_id VARCHAR(255) NOT NULL,
-  vehicle_id UUID NOT NULL REFERENCES vehicles(id) ON DELETE CASCADE,
-  type VARCHAR(100) NOT NULL,
-  category VARCHAR(50),
-  description TEXT,
-  due_date DATE,
-  due_mileage INTEGER,
-  completed_date DATE,
-  completed_mileage INTEGER,
-  cost DECIMAL(8,2),
-  service_location VARCHAR(200),
-  notes TEXT,
-  is_completed BOOLEAN DEFAULT false,
-  created_at TIMESTAMP WITH TIME ZONE,
-  updated_at TIMESTAMP WITH TIME ZONE
+  has_93_octane BOOLEAN,
+  reported_at TIMESTAMP WITH TIME ZONE,
+  removed_at TIMESTAMP WITH TIME ZONE,
+  removal_reason VARCHAR(100)
 )
 ```
 
-**Foreign Keys**: vehicle_id → vehicles.id (ON DELETE CASCADE)
-**Indexes**: user_id, vehicle_id, due_date, is_completed
-**Constraints**: Unique(vehicle_id, type), Check(category IN valid values)
+**Foreign Keys**: station_id -> stations.id
+**Purpose**: Track user reports of 93 octane availability
+
+## Platform Tables
+
+### engines
+Engine specifications for vehicle catalog.
+
+```sql
+engines (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(255) NOT NULL,
+  displacement VARCHAR(50),
+  configuration VARCHAR(50),
+  horsepower VARCHAR(100),
+  torque VARCHAR(100),
+  fuel_type VARCHAR(100),
+  fuel_system VARCHAR(255),
+  aspiration VARCHAR(100),
+  specs_json JSONB,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Unique Index**: LOWER(name) - case-insensitive uniqueness
+**Indexes**: displacement, configuration
+
+### transmissions
+Transmission specifications for vehicle catalog.
+
+```sql
+transmissions (
+  id SERIAL PRIMARY KEY,
+  type VARCHAR(100) NOT NULL,
+  speeds VARCHAR(50),
+  drive_type VARCHAR(100),
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Unique Index**: LOWER(type) - case-insensitive uniqueness
+
+### vehicle_options
+Denormalized vehicle lookup data for dropdown cascades.
+
+```sql
+vehicle_options (
+  id SERIAL PRIMARY KEY,
+  year INTEGER NOT NULL,
+  make VARCHAR(100) NOT NULL,
+  model VARCHAR(255) NOT NULL,
+  trim VARCHAR(255) NOT NULL,
+  engine_id INTEGER REFERENCES engines(id) ON DELETE SET NULL,
+  transmission_id INTEGER REFERENCES transmissions(id) ON DELETE SET NULL,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Foreign Keys**: engine_id -> engines.id, transmission_id -> transmissions.id
+**Unique Index**: (year, make, model, trim, engine_id, transmission_id)
+**Indexes**: Optimized for cascade queries (year, year+make, year+make+model, etc.)
+
+## Notification Tables
+
+### email_templates
+Admin-editable email templates.
+
+```sql
+email_templates (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  template_key VARCHAR(50) NOT NULL UNIQUE CHECK (template_key IN (
+    'maintenance_due_soon', 'maintenance_overdue',
+    'document_expiring', 'document_expired'
+  )),
+  name VARCHAR(100) NOT NULL,
+  description TEXT,
+  subject VARCHAR(255) NOT NULL,
+  body TEXT NOT NULL,
+  variables JSONB DEFAULT '[]'::jsonb,
+  is_active BOOLEAN DEFAULT true,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Seeded Templates**: 4 predefined templates for maintenance and document notifications
+
+### notification_logs
+Track sent email notifications.
+
+```sql
+notification_logs (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  user_id VARCHAR(255) NOT NULL,
+  notification_type VARCHAR(20) NOT NULL CHECK (notification_type IN ('email', 'toast')),
+  template_key VARCHAR(50) NOT NULL,
+  recipient_email VARCHAR(255),
+  subject VARCHAR(255),
+  reference_type VARCHAR(50),
+  reference_id UUID,
+  status VARCHAR(20) DEFAULT 'sent' CHECK (status IN ('pending', 'sent', 'failed')),
+  error_message TEXT,
+  sent_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+)
+```
+
+**Indexes**: user_id, reference_type+reference_id, sent_at
+
+## Backup Tables
+
+### backup_schedules
+Scheduled backup configurations.
+
+```sql
+backup_schedules (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  name VARCHAR(100) NOT NULL,
+  frequency VARCHAR(20) NOT NULL CHECK (frequency IN ('hourly', 'daily', 'weekly', 'monthly')),
+  cron_expression VARCHAR(50) NOT NULL,
+  retention_count INTEGER NOT NULL DEFAULT 7,
+  is_enabled BOOLEAN DEFAULT true,
+  last_run_at TIMESTAMP WITH TIME ZONE,
+  next_run_at TIMESTAMP WITH TIME ZONE,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+)
+```
+
+**Indexes**: is_enabled, next_run_at
+
+### backup_history
+Record of all backup operations.
+
+```sql
+backup_history (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  schedule_id UUID REFERENCES backup_schedules(id) ON DELETE SET NULL,
+  backup_type VARCHAR(20) NOT NULL CHECK (backup_type IN ('scheduled', 'manual')),
+  filename VARCHAR(255) NOT NULL,
+  file_path VARCHAR(500) NOT NULL,
+  file_size_bytes BIGINT NOT NULL,
+  database_tables_count INTEGER,
+  documents_count INTEGER,
+  status VARCHAR(20) NOT NULL CHECK (status IN ('in_progress', 'completed', 'failed')),
+  error_message TEXT,
+  started_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  completed_at TIMESTAMP WITH TIME ZONE,
+  created_by VARCHAR(255),
+  metadata JSONB DEFAULT '{}'
+)
+```
+
+**Foreign Keys**: schedule_id -> backup_schedules.id (ON DELETE SET NULL)
+**Indexes**: status, started_at, schedule_id
+
+### backup_settings
+Global backup configuration.
+
+```sql
+backup_settings (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  setting_key VARCHAR(50) UNIQUE NOT NULL,
+  setting_value TEXT NOT NULL,
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+)
+```
+
+**Default Settings**: email_on_success, email_on_failure, admin_email, max_backup_size_mb, compression_enabled
 
 ## Relationships
 
 ```
-vehicles (1) ──── (many) fuel_logs
-    │
-    └──── (many) maintenance
+user_profiles (1) ---- (1) user_preferences
+      |
+      +---- (1) terms_agreements
 
-stations (independent - no FK relationships)
+vehicles (1) ---- (many) fuel_logs
+    |
+    +---- (many) maintenance_logs
+    |
+    +---- (many) maintenance_schedules
+    |
+    +---- (many) documents
+
+stations (1) ---- (many) community_stations
+
+vehicle_options (many) ---- (1) engines
+       |
+       +---- (1) transmissions
+
+backup_schedules (1) ---- (many) backup_history
 ```
 
 ## Data Constraints
@@ -159,16 +509,16 @@ stations (independent - no FK relationships)
 - No cross-user data access possible
 
 ### Referential Integrity
-- fuel_logs.vehicle_id → vehicles.id (ON DELETE CASCADE)
-- maintenance.vehicle_id → vehicles.id (ON DELETE CASCADE)
-- Cascading deletes ensure related logs/maintenance are removed when vehicle is deleted
-- Soft deletes on vehicles (deleted_at) may result in orphaned hard-deleted related records
+- fuel_logs, maintenance_logs, maintenance_schedules, documents -> vehicles.id (ON DELETE CASCADE)
+- community_stations -> stations.id
+- vehicle_options -> engines.id, transmissions.id (ON DELETE SET NULL)
+- backup_history -> backup_schedules.id (ON DELETE SET NULL)
 
 ### VIN Validation
-- Exactly 17 characters
+- 17 characters when provided (now optional)
 - Cannot contain letters I, O, or Q
 - Application-level checksum validation
-- Unique per user (same VIN can exist for different users)
+- Either VIN or license_plate required
 
 ## Caching Strategy
 
@@ -177,13 +527,8 @@ stations (independent - no FK relationships)
 - **VIN decodes**: 7 days (key: `vin:decode:{vin}`)
 - **User vehicle lists**: 5 minutes (key: `vehicles:user:{userId}`)
 - **Fuel logs per vehicle**: 5 minutes (key: `fuel-logs:vehicle:{vehicleId}:{unitSystem}`)
-- **Vehicle statistics**: Real-time (no caching, fresh queries)
 - **Maintenance data**: Unit system-aware caching where applicable
 
-### Database-Level Caching
-- **vin_cache table**: Persistent cache for VIN decodes
-- **Cleanup**: Application-managed based on TTL strategy
-
 ## Migration Commands
 
 ### Run All Migrations
@@ -194,7 +539,6 @@ npm run migrate:all
 # Via Docker
 make migrate
 ```
-Single-feature migration is not implemented yet.
 
 ### Migration Files
 - **Location**: `backend/src/features/[feature]/migrations/`
@@ -205,29 +549,13 @@ Single-feature migration is not implemented yet.
 
 ### Development (Docker)
 - **Host**: mvp-postgres (container name)
-- **Port**: 5432 (internal), 5432 (external)
+- **Port**: 5432
 - **Database**: motovaultpro
 - **User**: postgres
 - **Password**: Loaded from secrets file `/run/secrets/postgres-password`
 
-**Password Management**: All database passwords are managed via Docker secrets, mounted from host files:
-- Application DB: `./secrets/app/postgres-password.txt`
-
 ### Connection Pool
 - **Implementation**: pg (node-postgres)
 - **Pool Size**: Default (10 connections)
 - **Idle Timeout**: 30 seconds
 - **Location**: `backend/src/core/config/database.ts`
-
-## Backup Strategy
-
-### Development
-- **Docker Volume**: `postgres_data`
-- **Persistence**: Survives container restarts
-- **Reset**: `make clean` removes all data
-
-### Production Considerations
-- Regular pg_dump backups
-- Point-in-time recovery
-- Read replicas for analytics
-- Connection pooling (PgBouncer)
diff --git a/docs/README.md b/docs/README.md
index 4f3bdeb..77d4298 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -10,18 +10,25 @@ Project documentation hub for the 5-container single-tenant architecture with in
 - Database schema: `docs/DATABASE-SCHEMA.md`
 - Testing (containers only): `docs/TESTING.md`
 - Database Migration: `docs/DATABASE-MIGRATION.md`
-- Admin feature: `docs/ADMIN.md` - Role management, APIs, catalog CRUD, station oversight
 - Development Environment: `docker-compose.yml`
 - Application features (start at each README):
   - `backend/src/features/admin/README.md` - Admin role management and oversight
-  - `backend/src/features/platform/README.md` - Vehicle data and VIN decoding
-  - `backend/src/features/vehicles/README.md` - User vehicle management
+  - `backend/src/features/auth/README.md` - User signup and email verification
+  - `backend/src/features/backup/README.md` - Database backup and restore
+  - `backend/src/features/documents/README.md` - Document storage and management
   - `backend/src/features/fuel-logs/README.md` - Fuel consumption tracking
   - `backend/src/features/maintenance/README.md` - Maintenance records
+  - `backend/src/features/notifications/README.md` - Email and toast notifications
+  - `backend/src/features/onboarding/README.md` - User onboarding flow
+  - `backend/src/features/platform/README.md` - Vehicle data and VIN decoding
   - `backend/src/features/stations/README.md` - Gas station search and favorites (Google Maps integration)
-  - `backend/src/features/documents/README.md` - Document storage and management
+  - `backend/src/features/terms-agreement/README.md` - Terms & Conditions acceptance audit
+  - `backend/src/features/user-export/README.md` - User data export (GDPR)
+  - `backend/src/features/user-preferences/README.md` - User preference settings
+  - `backend/src/features/user-profile/README.md` - User profile management
+  - `backend/src/features/vehicles/README.md` - User vehicle management
 
 ## Notes
 
 - Canonical URLs: Frontend `https://motovaultpro.com`, Backend health `https://motovaultpro.com/api/health`.
-- All 7 features have comprehensive test suites (unit + integration tests).
\ No newline at end of file
+- All 15 features have comprehensive test suites (unit + integration tests).
diff --git a/docs/TESTING.md b/docs/TESTING.md
index 7605b16..a3a3cd0 100644
--- a/docs/TESTING.md
+++ b/docs/TESTING.md
@@ -176,13 +176,21 @@ make clean && make start
 - **Seeding**: Use feature-level fixtures when needed
 
 ### Coverage and Availability
-All features have comprehensive test suites with unit and integration tests:
+All 15 features have test suites with unit and/or integration tests:
 - `admin` - Unit + integration tests
+- `auth` - Unit + integration tests
+- `backup` - Unit + integration tests
 - `documents` - Unit + integration tests
 - `fuel-logs` - Unit + integration tests
 - `maintenance` - Unit + integration tests
+- `notifications` - Unit + integration tests
+- `onboarding` - Unit tests
 - `platform` - Unit + integration tests
 - `stations` - Unit + integration tests (including community stations)
+- `terms-agreement` - Unit tests
+- `user-export` - Unit tests
+- `user-preferences` - Unit tests
+- `user-profile` - Unit + integration tests
 - `vehicles` - Unit + integration tests
 
 ### Mock Strategy
diff --git a/docs/VEHICLES-API.md b/docs/VEHICLES-API.md
index 4e90e7d..1ae466c 100644
--- a/docs/VEHICLES-API.md
+++ b/docs/VEHICLES-API.md
@@ -1,167 +1,434 @@
-# Vehicles API – Platform Rebuild, App Integration, and Operations
+# Vehicles API Reference
 
-This document explains the end‑to‑end Vehicles API architecture after the platform service rebuild, how the MotoVaultPro app consumes it, how migrations/seeding work, and how to operate the stack in production‑only development.
+Complete API documentation for the vehicles feature in MotoVaultPro.
 
 ## Overview
-- Architecture: MotoVaultPro backend (Fastify + TypeScript) includes an integrated platform module that shares Postgres and Redis with the rest of the stack.
-- Goal: Predictable year→make→model→trim→engine cascades, production‑only workflow, AI‑friendly code layout and docs.
 
-## Platform Vehicles Module
+The Vehicles API provides endpoints for managing user vehicles, including CRUD operations, image management, and hierarchical dropdown data for vehicle selection forms.
 
-### Database Schema (Postgres schema: `vehicles`)
-- `make(id, name)`
-- `model(id, make_id → make.id, name)`
-- `model_year(id, model_id → model.id, year)`
-- `trim(id, model_year_id → model_year.id, name)`
-- `engine(id, name, code, displacement_l, cylinders, fuel_type, aspiration)`
-- `trim_engine(trim_id → trim.id, engine_id → engine.id)`
-- Optional (present, not exposed yet): `transmission`, `trim_transmission`, `performance`
+**Authentication**: All endpoints require JWT authentication via `Authorization: Bearer <token>` header.
 
-Idempotent constraints/indexes added where applicable (e.g., unique lower(name), unique(model_id, year), guarded `CREATE INDEX IF NOT EXISTS`, guarded trigger).
+## Base URL
 
-### Dropdown API (Bearer auth required)
-Prefix: `/api/vehicles/dropdown`
-- `GET /years` → `[number]` (latest to oldest model years)
-- `GET /makes?year={year}` → `{ id, name }[]` (makes available in that year)
-- `GET /models?year={year}&make_id={make}` → `{ id, name }[]` (models filtered by year + make)
-- `GET /trims?year={year}&make_id={make}&model_id={model}` → `{ id, name }[]` (trims for the selection)
-- `GET /engines?year={year}&make_id={make}&model_id={model}&trim_id={trim}` → `{ id, name }[]` (engines for the trim)
-- `GET /transmissions?year={year}&make_id={make}&model_id={model}` → `{ id, name }[]` (`Automatic`, `Manual`)
+```
+https://motovaultpro.com/api
+```
 
-Selection order is enforced: each endpoint requires the IDs returned by the previous stage, so users never see invalid combinations (e.g., 2023 Chevrolet excludes the S-10, 1999 GMC trims exclude AT4X, etc.).
+## Vehicle CRUD Operations
 
-### Platform module (internal bridge)
-Prefix: `/api/platform`
-- Same hierarchical endpoints as above, but responses are wrapped (`{ makes: [...] }`, `{ models: [...] }`) for service-to-service integrations.
-- VIN decode endpoint: `GET /api/platform/vehicle?vin={vin}`
+### List User Vehicles
 
-### Authentication
-- Auth0 JWT via `Authorization: Bearer ${JWT_TOKEN}` (required for both `/api/vehicles/*` and `/api/platform/*`)
-- Configured in backend: `src/core/plugins/auth.plugin.ts` with JWKS validation
+Returns all vehicles for the authenticated user.
 
-### Caching (Redis)
-- Keys: `platform:years`, `platform:vehicle-data:makes:{year}`, `platform:vehicle-data:models:{year}:{make}`, `platform:vehicle-data:trims:{year}:{model}`, `platform:vehicle-data:engines:{year}:{model}:{trim}`
-- Dropdown TTL: 6 hours (`21600s`)
-- VIN decode TTL: 7 days (`604800s`) via `platform:vin-decode:{vin}`
-- Implementation: `backend/src/features/platform/domain/platform-cache.service.ts`
+```
+GET /api/vehicles
+```
 
-### Seeds & Specific Examples
-Platform seed migrations (TypeScript backend):
-- Schema definition (`backend/src/features/platform/migrations/001_create_platform_schema.sql`)
-- Constraints and indexes (`backend/src/features/platform/migrations/002_create_indexes.sql`)
-- Sample vehicle data (`backend/src/features/platform/migrations/003_seed_vehicles.sql`)
-Seeds are auto-migrated on backend container start via `backend/src/_system/migrations/run-all.ts`.
+**Response** (200):
+```json
+[
+  {
+    "id": "uuid",
+    "userId": "auth0|123456",
+    "vin": "1HGBH41JXMN109186",
+    "make": "Honda",
+    "model": "Civic",
+    "year": 2021,
+    "engine": "2.0L 4-Cylinder",
+    "transmission": "CVT Automatic",
+    "trimLevel": "EX",
+    "driveType": "FWD",
+    "fuelType": "Gasoline",
+    "nickname": "My Honda",
+    "color": "Blue",
+    "licensePlate": "ABC123",
+    "odometerReading": 15000,
+    "isActive": true,
+    "createdAt": "2025-01-01T00:00:00.000Z",
+    "updatedAt": "2025-01-01T00:00:00.000Z",
+    "imageUrl": "/api/vehicles/{id}/image"
+  }
+]
+```
 
-Clear platform cache:
-- `docker compose exec -T mvp-redis sh -lc "redis-cli FLUSHALL"`
-- Or restart containers: `make rebuild`
+### Get Single Vehicle
 
-## MotoVaultPro Backend (Application Service)
+```
+GET /api/vehicles/:id
+```
 
-### Proxy Dropdown Endpoints
-Vehicles service simply re-emits the data returned by `Platform VehicleDataService`, normalizing it to `{ id, name }[]` arrays for frontend consumption. Redis caching and Postgres lookups all remain centralized in the platform module.
+**Parameters**:
+- `id` (path): Vehicle UUID
 
-### Platform Integration
-- `VehiclesService` lazily instantiates `VehicleDataService` via `getVehicleDataService()`, guaranteeing a shared cache.
-- Each dropdown call passes the shared Postgres pool (`getPool()`) and propagates selection context (year/make/model/trim).
-- Transmission dropdown is intentionally static (`Automatic`, `Manual`) until richer metadata is available.
+**Response** (200): Single vehicle object (same structure as list item)
 
-### Authentication (App)
-- Auth0 JWT enforced via Fastify + JWKS. No mock users.
+**Errors**:
+- `404`: Vehicle not found or not owned by user
 
-### Migrations (Production‑Quality)
-- Migrations packaged in image under `/app/migrations/features/[feature]/migrations`.
-- Runner (`backend/src/_system/migrations/run-all.ts`):
-  - Reads base dir from `MIGRATIONS_DIR` (env in Dockerfile)
-  - Tracks executed files in `_migrations` table and skips already executed files
-  - **Idempotent at file level**: Safe to re-run migration system multiple times
-  - Wait/retry for DB readiness to avoid flapping on cold starts
-- Auto‑migrate on backend container start: `node dist/_system/migrations/run-all.js && npm start`
-- Manual: `make migrate` (runs runner inside the container)
+### Create Vehicle
 
-## Frontend Changes
-- Vehicles form cascades: year → make → model → trim → engine.
-  - Engines load only after a trim is selected (requires `trim_id`).
-- Validation updated: user must provide either a 17‑char VIN or a non‑empty license plate.
-  - VIN Decode button still requires a valid 17‑char VIN.
-- APIs used:
-  - `/api/vehicles/dropdown/years`
-  - `/api/vehicles/dropdown/makes|models|trims|engines`
-  - `/api/vehicles/dropdown/transmissions`
+```
+POST /api/vehicles
+```
 
-## Add Vehicle Form – Change/Add/Modify/Delete Fields (Fast Track)
+**Request Body**:
+```json
+{
+  "vin": "1HGBH41JXMN109186",
+  "year": 2021,
+  "make": "Honda",
+  "model": "Civic",
+  "engine": "2.0L 4-Cylinder",
+  "transmission": "CVT Automatic",
+  "trimLevel": "EX",
+  "driveType": "FWD",
+  "fuelType": "Gasoline",
+  "nickname": "My Honda",
+  "color": "Blue",
+  "licensePlate": "ABC123",
+  "odometerReading": 15000
+}
+```
 
-Where to edit
-- UI + validation: `frontend/src/features/vehicles/components/VehicleForm.tsx`
-- Frontend types: `frontend/src/features/vehicles/types/vehicles.types.ts`
-- Backend controller/service/repo: `backend/src/features/vehicles/api/vehicles.controller.ts`, `domain/vehicles.service.ts`, `data/vehicles.repository.ts`, types in `domain/vehicles.types.ts`
-- App DB migrations: `backend/src/features/vehicles/migrations/*.sql` (auto‑migrated on backend start)
+**Required**: Either `vin` OR `licensePlate` must be provided (not both required).
 
-Add a new field (example: bodyStyle)
-1) DB: `ALTER TABLE vehicles ADD COLUMN IF NOT EXISTS body_style VARCHAR(100);` in a new migration file.
-2) Backend: add `bodyStyle?: string;` to types; include in repository insert/update mapping as `body_style`.
-3) Frontend: add `bodyStyle` to Zod schema and a new input bound via `register('bodyStyle')`.
-4) Rebuild frontend/backend and verify in Network + logs.
+**Response** (201): Created vehicle object
 
-Modify an existing field
-- Update labels/placeholders in VehicleForm.
-- Update Zod schema for new validation rules; mirror on the server if desired.
-- Adjust service logic only if business behavior changes.
+### Update Vehicle
 
-Delete a field (safe path)
-- Remove from VehicleForm and frontend types.
-- Remove from backend types/repository mapping.
-- Optional migration to drop the column later.
+```
+PUT /api/vehicles/:id
+```
 
-Dropdown ordering
-- Implemented in VehicleForm; current order is Year → Make → Model → Trim → Engine → Transmission (static).
-- Engine select is enabled only after a Trim is selected.
+**Parameters**:
+- `id` (path): Vehicle UUID
 
-VIN/License rule
-- Frontend Zod: either 17‑char VIN or non‑empty license plate; if no plate, VIN must be 17.
-- Backend controller enforces the same rule; service decodes/validates only when VIN is present.
-- Repository normalizes empty VIN to NULL to avoid unique collisions.
+**Request Body**: Same fields as create (all optional, only provided fields are updated)
 
-## Operations
+**Response** (200): Updated vehicle object
 
-### Rebuild a single service
-- Frontend: `docker compose up -d --build frontend`
-- Backend (includes platform module): `docker compose up -d --build backend`
+### Delete Vehicle
 
-### Logs & Health
-- Backend: `https://motovaultpro.com/api/health` – shows status/feature list, including platform readiness
-- Logs: `make logs-backend`, `make logs-frontend`
+Soft-deletes a vehicle (sets `deleted_at` timestamp).
 
-### Common Reset Sequences
-- Platform seed reapply (non‑destructive): apply `005_seed_specific_vehicles.sql` and flush Redis cache.
-- Platform reset (WARNING - DESTRUCTIVE to shared resources):
-  - `docker compose rm -sf mvp-postgres mvp-redis`
-  - `docker volume rm motovaultpro_postgres_data motovaultpro_redis_data`
-  - `docker compose up -d mvp-postgres mvp-redis mvp-backend`
-  - Note: This will destroy ALL application data, not just platform data, as database and cache are shared
+```
+DELETE /api/vehicles/:id
+```
 
-## Security Summary
-- Platform Module: Auth0 JWT via `Authorization: Bearer ${JWT_TOKEN}` required on all `/api/platform/*` endpoints.
-- Vehicles Feature: Auth0 JWT required on all protected `/api/vehicles/*` routes.
-- Health Check: `/api/health` is unauthenticated (Traefik readiness probe).
+**Parameters**:
+- `id` (path): Vehicle UUID
 
-## CI Summary
-- Workflow `.github/workflows/ci.yml` builds backend/frontend/platform API.
-- Runs backend lint/tests in a builder image on a stable network.
+**Response** (204): No content
 
-## Troubleshooting
-- Frontend shows generic “Server error” right after login:
-  - Check backend `/api/vehicles` 500s (migrations not run or DB unavailable).
-  - Run `make migrate` or ensure backend container auto‑migrate is succeeding; check `docker compose logs backend`.
-- Dropdowns not updating after seed:
-  - Run specific seed SQL (see above) and `redis-cli FLUSHALL` on shared Redis (mvp-redis).
-- Backend flapping on start after rebuild:
-  - Ensure Postgres is up; the runner now waits/retries, but confirm logs.
+## Vehicle Images
 
-## Notable Files
-- Platform schema & seeds: maintained by database admins (legacy FastAPI scripts available on request)
-- Platform API integration: `backend/src/features/platform/api/*`
-- Backend dropdown proxy: `backend/src/features/vehicles/api/*`
-- Backend platform module: `backend/src/features/platform/*`
-- Backend migrations runner: `backend/src/_system/migrations/run-all.ts`
-- Frontend vehicles UI: `frontend/src/features/vehicles/*`
+### Upload Image
+
+Upload or replace the vehicle's image.
+
+```
+POST /api/vehicles/:id/image
+Content-Type: multipart/form-data
+```
+
+**Parameters**:
+- `id` (path): Vehicle UUID
+
+**Form Data**:
+- `image`: Image file (JPEG, PNG, WebP; max 5MB)
+
+**Response** (200):
+```json
+{
+  "success": true,
+  "imageUrl": "/api/vehicles/{id}/image"
+}
+```
+
+### Download Image
+
+```
+GET /api/vehicles/:id/image
+```
+
+**Parameters**:
+- `id` (path): Vehicle UUID
+
+**Response**: Image binary with appropriate `Content-Type` header
+
+**Errors**:
+- `404`: No image exists for vehicle
+
+### Delete Image
+
+```
+DELETE /api/vehicles/:id/image
+```
+
+**Parameters**:
+- `id` (path): Vehicle UUID
+
+**Response** (204): No content
+
+## Dropdown Cascade API
+
+Hierarchical endpoints for vehicle selection dropdowns. Each level filters based on previous selections.
+
+### Get Years
+
+Returns available model years in descending order.
+
+```
+GET /api/vehicles/dropdown/years
+```
+
+**Response** (200):
+```json
+{
+  "years": [2025, 2024, 2023, 2022, ...]
+}
+```
+
+### Get Makes
+
+Returns makes available for a specific year.
+
+```
+GET /api/vehicles/dropdown/makes?year={year}
+```
+
+**Query Parameters**:
+- `year` (required): Model year (e.g., 2024)
+
+**Response** (200):
+```json
+{
+  "makes": ["Acura", "Audi", "BMW", "Chevrolet", "Ford", ...]
+}
+```
+
+### Get Models
+
+Returns models available for a specific year and make.
+
+```
+GET /api/vehicles/dropdown/models?year={year}&make={make}
+```
+
+**Query Parameters**:
+- `year` (required): Model year
+- `make` (required): Make name (e.g., "Ford")
+
+**Response** (200):
+```json
+{
+  "models": ["Bronco", "Edge", "Explorer", "F-150", "Mustang", ...]
+}
+```
+
+### Get Trims
+
+Returns trims available for a specific year, make, and model.
+
+```
+GET /api/vehicles/dropdown/trims?year={year}&make={make}&model={model}
+```
+
+**Query Parameters**:
+- `year` (required): Model year
+- `make` (required): Make name
+- `model` (required): Model name (e.g., "F-150")
+
+**Response** (200):
+```json
+{
+  "trims": ["XL", "XLT", "Lariat", "King Ranch", "Platinum", ...]
+}
+```
+
+### Get Engines
+
+Returns engines available for a specific year, make, model, and trim.
+
+```
+GET /api/vehicles/dropdown/engines?year={year}&make={make}&model={model}&trim={trim}
+```
+
+**Query Parameters**:
+- `year` (required): Model year
+- `make` (required): Make name
+- `model` (required): Model name
+- `trim` (required): Trim level (e.g., "XLT")
+
+**Response** (200):
+```json
+{
+  "engines": [
+    "3.3L V6 Ti-VCT",
+    "2.7L V6 EcoBoost",
+    "5.0L V8 Ti-VCT",
+    "3.5L V6 EcoBoost"
+  ]
+}
+```
+
+### Get Transmissions
+
+Returns transmissions available for a specific year, make, model, and trim.
+
+```
+GET /api/vehicles/dropdown/transmissions?year={year}&make={make}&model={model}&trim={trim}
+```
+
+**Query Parameters**:
+- `year` (required): Model year
+- `make` (required): Make name
+- `model` (required): Model name
+- `trim` (required): Trim level
+
+**Response** (200):
+```json
+{
+  "transmissions": [
+    "10-Speed Automatic",
+    "6-Speed Automatic"
+  ]
+}
+```
+
+### Get Pair-Safe Options
+
+Returns valid engine/transmission combinations, ensuring only compatible pairs are shown.
+
+```
+GET /api/vehicles/dropdown/options?year={year}&make={make}&model={model}&trim={trim}[&engine={engine}][&transmission={transmission}]
+```
+
+**Query Parameters**:
+- `year` (required): Model year
+- `make` (required): Make name
+- `model` (required): Model name
+- `trim` (required): Trim level
+- `engine` (optional): If provided, returns only transmissions compatible with this engine
+- `transmission` (optional): If provided, returns only engines compatible with this transmission
+
+**Response** (200):
+```json
+{
+  "engines": ["3.3L V6 Ti-VCT", "2.7L V6 EcoBoost"],
+  "transmissions": ["10-Speed Automatic"]
+}
+```
+
+## Platform API
+
+Direct platform endpoints for vehicle data lookups (alternative to dropdown cascade).
+
+```
+GET /api/platform/years
+GET /api/platform/makes?year={year}
+GET /api/platform/models?year={year}&make={make}
+GET /api/platform/trims?year={year}&make={make}&model={model}
+GET /api/platform/engines?year={year}&make={make}&model={model}&trim={trim}
+GET /api/platform/transmissions?year={year}&make={make}&model={model}&trim={trim}
+```
+
+Same functionality as dropdown cascade API but with `/api/platform/` prefix.
+
+## Error Responses
+
+All endpoints return standard error responses:
+
+```json
+{
+  "error": "Error message",
+  "statusCode": 400
+}
+```
+
+**Common Status Codes**:
+- `400`: Bad request (validation error)
+- `401`: Unauthorized (missing or invalid JWT)
+- `404`: Resource not found
+- `500`: Internal server error
+
+## Data Model
+
+### Vehicle Fields
+
+| Field | Type | Required | Description |
+|-------|------|----------|-------------|
+| id | UUID | Auto | Primary key |
+| userId | string | Auto | Auth0 user ID (from JWT) |
+| vin | string | No* | Vehicle Identification Number (17 chars) |
+| make | string | No | Manufacturer (e.g., "Ford") |
+| model | string | No | Model name (e.g., "F-150") |
+| year | integer | No | Model year |
+| engine | string | No | Engine specification |
+| transmission | string | No | Transmission type |
+| trimLevel | string | No | Trim level (e.g., "XLT") |
+| driveType | string | No | Drive type (e.g., "4WD", "FWD") |
+| fuelType | string | No | Fuel type (e.g., "Gasoline", "Diesel") |
+| nickname | string | No | User-defined name |
+| color | string | No | Vehicle color |
+| licensePlate | string | No* | License plate number |
+| odometerReading | integer | No | Current odometer (default: 0) |
+| isActive | boolean | Auto | Active status (default: true) |
+| createdAt | datetime | Auto | Creation timestamp |
+| updatedAt | datetime | Auto | Last update timestamp |
+| imageUrl | string | Auto | URL to vehicle image (if uploaded) |
+
+*Either `vin` OR `licensePlate` should be provided for vehicle identification.
+
+### VIN Validation
+
+When a VIN is provided:
+- Must be exactly 17 characters
+- Cannot contain letters I, O, or Q
+- Check digit validation is performed
+
+## Database Schema
+
+### Platform Tables
+
+Vehicle lookup data is stored in three denormalized tables optimized for dropdown cascade queries:
+
+- **engines**: Engine specifications (name, displacement, horsepower, fuel_type, etc.)
+- **transmissions**: Transmission types (type, speeds, drive_type)
+- **vehicle_options**: Denormalized year/make/model/trim combinations with engine/transmission references
+
+See `docs/DATABASE-SCHEMA.md` for complete table definitions.
+
+### Migration Location
+
+Platform migrations: `backend/src/features/platform/migrations/001_create_vehicle_lookup_schema.sql`
+
+## Caching
+
+- **Dropdown data**: Cached in Redis for 6 hours (key: `dropdown:{dataType}:{params}`)
+- **User vehicle lists**: Cached for 5 minutes (key: `vehicles:user:{userId}`)
+- Cache is invalidated on vehicle create/update/delete operations
+
+## Frontend Integration
+
+### Form Cascade Order
+
+The vehicle form uses cascading dropdowns in this order:
+1. Year (loads makes)
+2. Make (loads models)
+3. Model (loads trims)
+4. Trim (loads engines and transmissions)
+5. Engine and Transmission (pair-safe filtering via `/dropdown/options`)
+
+### Files
+
+- Form component: `frontend/src/features/vehicles/components/VehicleForm.tsx`
+- Types: `frontend/src/features/vehicles/types/vehicles.types.ts`
+- API hooks: `frontend/src/features/vehicles/hooks/`
+
+## Related Documentation
+
+- Feature README: `backend/src/features/vehicles/README.md`
+- Platform README: `backend/src/features/platform/README.md`
+- Database Schema: `docs/DATABASE-SCHEMA.md`
+- Architecture: `docs/ARCHITECTURE-OVERVIEW.md`