feat: expand documents to include manuals

backend/src/features/documents/migrations/002_add_manual_document_type.sql

@@ -0,0 +1,17 @@
+-- Migration: Add 'manual' document type and scan_for_maintenance column
+-- Purpose: Support vehicle/equipment manuals with future maintenance schedule scanning
+
+-- Step 1: Extend document_type CHECK constraint to include 'manual'
+-- Note: Must drop and recreate since PostgreSQL doesn't support ALTER CONSTRAINT
+ALTER TABLE documents DROP CONSTRAINT IF EXISTS documents_document_type_check;
+ALTER TABLE documents ADD CONSTRAINT documents_document_type_check
+  CHECK (document_type IN ('insurance', 'registration', 'manual'));
+
+-- Step 2: Add scan_for_maintenance boolean column
+-- Only applicable to 'manual' type, defaults to false
+ALTER TABLE documents ADD COLUMN IF NOT EXISTS scan_for_maintenance BOOLEAN DEFAULT false;
+
+-- Step 3: Create partial index for future maintenance scanning queries
+CREATE INDEX IF NOT EXISTS idx_documents_scan_for_maintenance
+  ON documents(scan_for_maintenance)
+  WHERE scan_for_maintenance = true AND deleted_at IS NULL AND document_type = 'manual';