docs(03-01): complete image infrastructure plan

Tasks completed: 3/3
- Database schema and repository for images
- File storage and thumbnail generation utilities
- API endpoints for serving images

SUMMARY: .planning/phases/03-images/03-01-SUMMARY.md

.planning/phases/03-images/03-01-SUMMARY.md

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+---
+phase: 03-images
+plan: 01
+subsystem: images
+tags: [sharp, thumbnails, file-storage, api-endpoints, sqlite]
+
+# Dependency graph
+requires:
+  - phase: 01-foundation
+    provides: database schema patterns, repository pattern
+  - phase: 02-core-crud
+    provides: entries table for foreign key relationship
+provides:
+  - images table with entry relationship
+  - imageRepository for CRUD operations
+  - File storage utilities for originals and thumbnails
+  - Sharp-based thumbnail generation with EXIF rotation
+  - API endpoints for serving images
+affects: [03-02-upload-api, 03-03-ui-components]
+
+# Tech tracking
+tech-stack:
+  added: [sharp]
+  patterns: [image storage in data/uploads, thumbnails always jpg, immutable cache headers]
+
+key-files:
+  created:
+    - src/lib/server/images/storage.ts
+    - src/lib/server/images/thumbnails.ts
+    - src/routes/api/images/[id]/+server.ts
+    - src/routes/api/images/[id]/thumbnail/+server.ts
+  modified:
+    - src/lib/server/db/schema.ts
+    - src/lib/server/db/repository.ts
+
+key-decisions:
+  - "Thumbnails always stored as JPEG regardless of original format"
+  - "EXIF rotation handled via sharp.rotate() before resize"
+  - "Immutable cache headers (1 year) since image IDs never change"
+  - "Cascade delete on entry deletion"
+
+patterns-established:
+  - "Image storage: data/uploads/originals/{id}.{ext}, data/uploads/thumbnails/{id}.jpg"
+  - "Repository pattern extended for images with same singleton approach"
+
+# Metrics
+duration: 4min
+completed: 2026-01-29
+---
+
+# Phase 03 Plan 01: Image Infrastructure Summary
+
+**Sharp-based image storage with thumbnails, EXIF auto-rotation, and API endpoints for serving images**
+
+## Performance
+
+- **Duration:** 4 min
+- **Started:** 2026-01-29T14:21:57Z
+- **Completed:** 2026-01-29T14:26:00Z
+- **Tasks:** 3
+- **Files modified:** 6
+
+## Accomplishments
+- Images table with entryId foreign key and cascade delete
+- ImageRepository with full CRUD (create, getById, getByEntryId, delete, deleteByEntryId)
+- File storage utilities with directory management
+- Thumbnail generation with EXIF auto-rotation for mobile photos
+- GET endpoints for original images and thumbnails with proper caching
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Database schema and repository for images** - `f5b5034` (feat)
+2. **Task 2: File storage and thumbnail generation utilities** - `0987d16` (feat)
+3. **Task 3: API endpoints for serving images** - `b3640e7` (feat)
+
+## Files Created/Modified
+- `src/lib/server/db/schema.ts` - Added images table with entryId FK
+- `src/lib/server/db/repository.ts` - Added imageRepository singleton
+- `src/lib/server/images/storage.ts` - File I/O utilities for originals/thumbnails
+- `src/lib/server/images/thumbnails.ts` - Sharp thumbnail generation with EXIF rotation
+- `src/routes/api/images/[id]/+server.ts` - GET endpoint for original images
+- `src/routes/api/images/[id]/thumbnail/+server.ts` - GET endpoint for thumbnails
+
+## Decisions Made
+- **Thumbnails always JPEG:** Regardless of original format, thumbnails saved as .jpg for consistency and size optimization
+- **EXIF rotation first:** Call sharp.rotate() before resize to handle mobile photo orientation
+- **Immutable caching:** Cache-Control: public, max-age=31536000, immutable since image content never changes by ID
+- **Cascade delete:** ON DELETE CASCADE on entryId so deleting entry removes images from DB (files handled separately)
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Image infrastructure ready for upload API (03-02)
+- Repository and storage utilities available for upload processing
+- API endpoints ready to serve uploaded images
+
+---
+*Phase: 03-images*
+*Completed: 2026-01-29*