Add checkup review flags, duplicate detection, and corrected painting images.

Introduce checkup_checked/checkup_fixed on paintings with Checkup page filters and API. Fixed paintings auto-mark as reviewed. Add find-duplicates tooling and document debug/checkup workflow. Include Botticelli and Michelangelo image fixes from checkup.

Co-authored-by: Cursor <cursoragent@cursor.com>

Documentation/setup.md

@@ -65,6 +65,7 @@ After a fresh seed, run these to match a fully populated local install:
 npm run fetch-artist-bios          # bio_short / bio_full from Wikipedia
 npm run expand-catalog             # famous works for artists below MIN_PAINTINGS
 npm run update-influences          # painting influence graph for detail view + hall exits
+npm run migrate:checkup-flags      # optional: review/fixed flags for Checkup page
 npm run fetch-images -- --limit=50                # random sample; 10s max per painting (default)
 npm run fetch-images -- --limit=50 --max-wait=120 # same batch size, longer lookup per work
 cd client && npm run build && cd ..
@@ -112,6 +113,8 @@ Open http://localhost:3001 (or your configured `PORT`).
 | `npm run fetch-artist-images` | `scripts/fetch-artist-images.js` | Backfill portrait files *(if present)* |
 | `npm run sync-image-paths` | `scripts/sync-image-paths.js` | Align DB paths with disk *(if present)* |
 | `npm run migrate:influence-sources` | `scripts/migrate-influence-sources.js` | Create `painting_influence_sources` + backfill legacy edges |
+| `npm run migrate:checkup-flags` | `scripts/migrate-checkup-flags.js` | Add `checkup_checked` / `checkup_fixed` on `paintings` |
+| `npm run find-duplicates` | `scripts/find-duplicate-paintings.js` | Report duplicate and near-duplicate painting rows |
 | `npm run update-influences` | `scripts/update-influences.js` | Insert influence links (painting / artist / movement) from `art-influences-data.js` |
 | `npm run update-influences -- --fetch-images` | ↑ | Also download images for newly created works |
 | `npm run update-influences -- --discover` | ↑ | Curated pass + web discovery (Wikipedia, Wikidata, Met, art-history sites) |
@@ -127,6 +130,8 @@ These are checked in and maintained:
 - `update-influences.js` + `art-influences-data.js` — influence graph (paintings, artists, movements)
 - `influence-discovery.js` + `influence-resolver.js` — web discovery and polymorphic source resolution
 - `fetch-missing-images.js` — batch image backfill
+- `find-duplicate-paintings.js` — duplicate catalog audit
+- `migrate-checkup-flags.js` — checkup workflow columns
 - `regenerate-thumbnails.js`, `audit-painting-images.js`
 
 These are referenced in `package.json` but may need to be restored from git history if missing locally: `seed-wikipedia.js`, `fetch-artist-images.js`, `sync-image-paths.js`.
@@ -162,3 +167,5 @@ After clone: copy `.env.example` → `.env`, install dependencies, run `npm run
 | Default Vite page instead of gallery | `client/dist` missing or stale | `cd client && npm run build` |
 | Permission denied creating tables | `gallery` user lacks CREATE | Run admin grants, then migrate |
 | Wikipedia API rate limit during fetch | Too many requests in a row | Wait and re-run; scripts retry with backoff |
+| Checkup **Reviewed** toggle returns 404 | Stale server process missing new routes | Restart `npm run dev` after pulling API changes |
+| Duplicate works in gallery / timeline | Double import or variant Wikipedia titles | `npm run find-duplicates`; merge or delete spare rows manually |