---
phase: 29
plan: 01
subsystem: backend
tags: [schema, image-processing, sharp]
key-files:
  created: []
  modified:
    - src/db/schema.ts
    - src/shared/schemas.ts
    - src/server/services/image.service.ts
    - src/server/routes/images.ts
    - package.json
metrics:
  tasks: 7
  commits: 5
  files-changed: 6
---

# Plan 29-01 Summary: Schema + Dominant Color Extraction

## What was built
- Installed Sharp image processing library for server-side color extraction
- Added `dominant_color`, `crop_zoom`, `crop_x`, `crop_y` columns to items, global_items, and thread_candidates tables
- Created `extractDominantColor()` function that resizes image to 1x1 pixel for weighted average color
- Integrated color extraction into both image upload endpoints (direct and from-url)
- Updated Zod schemas for items, candidates, and global items to accept new fields
- Generated Drizzle migration (db:push deferred — requires running database)

## Commits

| Task | Commit | Description |
|------|--------|-------------|
| 1 | cee1500 | Install Sharp for image processing |
| 2 | 36363a8 | Add dominantColor and crop fields to schema |
| 3 | b637b10 | Generate migration for image presentation fields |
| 4 | e305fa7 | Add dominant color extraction via Sharp |
| 5 | 2696b78 | Extract dominant color in image upload endpoints |
| 6 | 3480473 | Add image presentation fields to Zod schemas |
| 7 | — | No changes needed (storage service already spreads fields) |

## Deviations
- Task 3 (db:push): Database not accessible in dev environment — migration generated but push deferred to deployment. This is non-blocking for frontend work.

## Self-Check: PASSED
- Sharp installed: YES
- dominant_color in 3 tables: YES (grep confirms 3 occurrences)
- Zod schemas updated: YES (3 schemas)
- Upload returns dominantColor: YES
- Lint passes: YES
