Add influence rework, image checkup, debug mode, and fetched paintings.

Support artist and movement influence links with web discovery, a developer checkup table with gallery/detail thumbnails, and debug image search with fix-it workflow.

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

Documentation/API.md

@@ -164,8 +164,25 @@ Painting detail with influence graph neighbours.
 ```json
 {
   "painting": { "id": 10, "title": "...", "artist_name": "...", "image_path": "...", "has_influence_links": true, ... },
-  "influencedBy": [ { "id": 3, "title": "...", "artist_name": "...", "notes": "...", "aspects": "...", "quote": "...", "source_author": "...", ... } ],
+  "influencedBy": [
-  "influenced": [ { "id": 20, "title": "...", ... } ]
+    {
+      "source_type": "painting",
+      "id": 3, "title": "...", "artist_name": "...", "year": 1885,
+      "notes": "...", "aspects": "...", "quote": "...", "source_author": "...", "source_url": "..."
+    },
+    {
+      "source_type": "artist",
+      "source_artist_id": 12, "source_artist_name": "Paul Cézanne",
+      "artist_portrait": "...", "period_note": "during creation (1907)",
+      "period_start_year": 1907, "period_end_year": 1907
+    },
+    {
+      "source_type": "movement",
+      "movement_id": 8, "movement_name": "Fauvism", "movement_color": "#c45c26",
+      "period_start_year": 1905, "period_end_year": 1907
+    }
+  ],
+  "influenced": [ { "source_type": "painting", "id": 20, "title": "...", ... } ]
 }
 ```
 

Documentation/DB_structure.md

@@ -24,6 +24,9 @@ erDiagram
   artist_periods ||--o{ paintings : groups
   paintings ||--o{ painting_influences : influenced_by
   paintings ||--o{ painting_influences : influences
+  paintings ||--o{ painting_influence_sources : influenced_by
+  artists ||--o{ painting_influence_sources : artist_source
+  art_movements ||--o{ painting_influence_sources : movement_source
 ```
 
 ## Tables
@@ -114,7 +117,35 @@ Directed edges: *this painting* was influenced by *that painting*.
 
 Unique constraint on `(painting_id, influenced_by_painting_id)`.
 
-Used by the 3D gallery exit panel: predecessors are artists of `influenced_by_painting_id` works; successors are artists of paintings influenced by this artist’s works (see [API.md](API.md#get-apiartistsidnavigation)).
+Used by the 3D gallery exit panel: predecessors are artists of `influenced_by_painting_id` works; successors are artists of paintings influenced by this artist’s works (see [API.md](API.md#get-apiartistsidnavigation)). Legacy table; new polymorphic links live in `painting_influence_sources`.
+
+### `painting_influence_sources`
+
+Polymorphic influence links: *this painting* was influenced by a **painting**, **artist**, or **movement**.
+
+| Column | Type | Notes |
+|--------|------|-------|
+| `id` | SERIAL PK | |
+| `painting_id` | FK → `paintings` | The work being explained |
+| `source_type` | VARCHAR(20) | `painting`, `artist`, or `movement` |
+| `source_painting_id` | FK → `paintings` | When `source_type = painting` |
+| `source_artist_id` | FK → `artists` | When `source_type = artist` |
+| `source_movement_id` | FK → `art_movements` | When `source_type = movement` |
+| `period_note` | VARCHAR(240) | Human-readable period label |
+| `period_start_year` | INTEGER | Optional span start |
+| `period_end_year` | INTEGER | Optional span end |
+| `notes` | TEXT | Curator summary |
+| `source` | VARCHAR(500) | General attribution |
+| `aspects` | TEXT | What was borrowed |
+| `quote` | TEXT | Short citation |
+| `source_author` | VARCHAR(200) | e.g. Gombrich, Janson |
+| `source_url` | VARCHAR(500) | Reference link |
+| `discovered_via` | VARCHAR(120) | e.g. `wikipedia`, `wikidata`, `web:metmuseum.org` |
+| `confidence` | VARCHAR(20) | `curated` (default) or `discovered` |
+
+Unique index on `(painting_id, source_type, source_painting_id, source_artist_id, source_movement_id)` with COALESCE for null FKs.
+
+Used by painting detail API (`influencedBy`). Painting-type rows also feed `has_influence_links` and hall navigation (with legacy `painting_influences`).
 
 ## Indexes
 
@@ -122,6 +153,7 @@ Used by the 3D gallery exit panel: predecessors are artists of `influenced_by_pa
 - `paintings(artist_id)`, `paintings(period_id)`
 - `art_movements(era_id)`, `art_movements(start_year, end_year)`
 - `painting_influences(painting_id)`, `painting_influences(influenced_by_painting_id)`
+- `painting_influence_sources(painting_id)`, `painting_influence_sources(source_artist_id)`, `painting_influence_sources(source_movement_id)`
 
 ## First-time setup
 

Documentation/basics.md

@@ -9,7 +9,7 @@ The app is organised as a **drill-down hierarchy**:
 1. **Timeline** — historical eras (Ancient → Contemporary) with definite or fuzzy date boundaries.
 2. **Movement flow** — art movements as curved SVG streams on the same year axis; documented predecessor→successor branches; portrait thumbnails placed along each stream.
 3. **3D gallery** — one personal hall per artist; paintings on the walls, open centre, single exit for influence-based navigation.
-4. **Painting detail** — full work in the centre, *Influenced By* on the left, *Influenced* on the right, prev/next catalog browsing, optional fullscreen, link to artist biography.
+4. **Painting detail** — full work in the centre, *Influenced By* on the left, *Influenced* on the right (paintings, artists, or movements), prev/next catalog browsing, optional fullscreen, link to artist biography.
 5. **Artist biography** — portrait, lifespan, movement, and Wikipedia-sourced intro text (`bio_short` / `bio_full`).
 
 All artwork images are stored locally under `data/images/` — the UI never hot-links to Wikipedia or Commons at runtime (except optional on-demand fetch when a file is missing).
@@ -149,7 +149,7 @@ Each artist appears as a **portrait circle** on their movement’s stream row:
 
 Artist portraits stop wheel/drag propagation so zooming over a face does not fight portrait clicks.
 
-**Note:** Movement lineage is **frontend curation** for layout and labels — it is not stored in PostgreSQL. Painting-to-painting influence edges (`painting_influences`) are separate and drive the 3D exit picker and detail panels.
+**Note:** Movement lineage is **frontend curation** for layout and labels — it is not stored in PostgreSQL. Painting influence links (`painting_influence_sources`, plus legacy `painting_influences` for hall navigation) are separate and drive the 3D exit picker and detail panels.
 
 ## Virtual gallery (3D halls)
 
@@ -191,7 +191,7 @@ Opened from the 3D hall (click a frame) or from influence thumbnails on another
 
 | Layer | What you see |
 |-------|----------------|
-| **Detail** | Centre image, *Influenced By* (left) and *Influenced* (right), position in catalog (e.g. `3 of 12`) |
+| **Detail** | Centre image, *Influenced By* (left) and *Influenced* (right) — painting thumbnails, artist portraits, or movement swatches — position in catalog (e.g. `3 of 12`) |
 | **Fullscreen** | Click the centre image; `Escape` or click anywhere to return to detail only |
 
 **Controls:**
@@ -202,6 +202,7 @@ Opened from the 3D hall (click a frame) or from influence thumbnails on another
 | `←` / `→` | Same as prev / next (disabled while fullscreen is open) |
 | Click centre image | Open fullscreen lightbox |
 | Click influence thumbnail | Open that work’s detail (different artist allowed) |
+| Click influence artist portrait | Open that artist’s 3D gallery hall |
 | **← Back to Gallery** | Return to the hall you entered from — **3D camera position is preserved** |
 | **About {artist}** | Open artist biography |
 
@@ -217,9 +218,9 @@ Opened from the 3D hall (click a frame) or from influence thumbnails on another
 - **Movement filtering** on zoom only shows movements that have at least one artist active in the visible year range.
 - **Movement lineage** (`movement-lineage.ts`) documents art-historical predecessor→successor links for the flow diagram; extend that file to add or correct branches.
 - **One hall per artist** keeps navigation predictable: enter from the timeline or bio, leave via the single exit or back button.
-- **Influence-based hall links** connect artists through documented painting-to-painting relationships, grouped by movement at the exit.
+- **Influence-based hall links** connect artists through documented painting relationships, grouped by movement at the exit.
 - **3D gallery images** use locally cached files only; slow remote fetches would break realtime rendering.
-- **Influence data** is stored as directed edges between paintings, with optional citation fields (source author, quote, URL) for art-historical references.
+- **Influence data** is stored as directed links from paintings to sources (another painting, an artist, or a movement), with optional period fields and citation metadata (source author, quote, URL).
 
 ## Related docs
 

Documentation/data-and-images.md

@@ -113,22 +113,68 @@ Renaissance and medieval masters with large museum catalog dumps (e.g. Raphael,
 
 ## Painting influence graph
 
-Directed edges in `painting_influences` drive:
+Directed influence links are stored in **`painting_influence_sources`**. Each row connects a painting to a **source** of type `painting`, `artist`, or `movement`, with optional period context (e.g. influence during the work’s creation year).
 
-- **Painting detail** — *Influenced By* (left) and *Influenced* (right) panels with notes, aspects, and citations
+The legacy **`painting_influences`** table (painting-to-painting only) is still written for hall navigation compatibility and is backfilled into `painting_influence_sources` on migration.
-- **3D hall exit** — predecessor and successor artists grouped by movement
+
-- **3D gallery lamps** — a golden picture light above any frame whose work has an influence edge (`has_influence_links` on painting API responses)
+Influence data drives:
+
+- **Painting detail** — *Influenced By* (left) and *Influenced* (right) panels: painting thumbnails, artist portraits, or movement colour swatches, plus notes, aspects, period labels, and citations
+- **3D hall exit** — predecessor and successor artists grouped by movement (painting edges only)
+- **3D gallery lamps** — golden picture light above frames with any influence edge (`has_influence_links` on painting API responses)
+
+### One-time migration
+
+```bash
+npm run migrate:influence-sources   # create table + backfill legacy painting edges
+```
+
+### Curated updates
 
 `npm run update-influences` runs `scripts/update-influences.js` against `scripts/art-influences-data.js`:
 
 ```bash
-npm run update-influences                    # insert edges; create missing artists/paintings
+npm run update-influences                         # insert curated edges
 npm run update-influences -- --fetch-images       # also download images for newly created works
+npm run update-influences -- --discover           # curated + web discovery pass
+npm run discover-influences                       # discovery only (no curated file pass)
+npm run update-influences -- --discover --limit=20  # cap discovery to N works
 ```
 
-Each entry defines a later `work` influenced by an earlier `influencedBy` painting, plus optional curator fields (`notes`, `aspects`, `source_author`, `source`). When `artistMeta` is included, missing artists are created with movement and lifespan. Missing paintings are inserted with `wikipedia_title` for image fetch.
+Each entry defines a later `work` and one or more `influencedBy` sources. Legacy single-object form is still supported:
 
-Extend the data file to add lineage chains (e.g. Giotto → Masaccio → Michelangelo → Manet → Picasso → Warhol). New bridge artists may include Géricault, Friedrich, Constable, Giorgione, Poussin, de Chirico, and Böcklin.
+```javascript
+{ work: { artist: '...', title: '...', year: 1907 },
+  influencedBy: { artist: 'Giotto', title: 'Lamentation' } }
+```
+
+Multi-source form (painting, artist, movement):
+
+```javascript
+{
+  work: { artist: 'Pablo Picasso', title: "Les Demoiselles d'Avignon", year: 1907 },
+  influencedBy: [
+    { type: 'painting', artist: 'Paul Cézanne', title: 'The Bathers' },
+    { type: 'artist', artist: 'Paul Cézanne', period: { duringCreation: true } },
+    { type: 'movement', movement: 'Fauvism', period: { start: 1905, end: 1907, note: '...' } },
+  ],
+  notes, aspects, source_author, source, source_url,
+}
+```
+
+When `artistMeta` is included, missing artists are created with movement and lifespan. Missing paintings are inserted with `wikipedia_title` for image fetch.
+
+### Web discovery
+
+`scripts/influence-discovery.js` searches art-history sources when `--discover` or `--discover-only` is passed:
+
+- Wikipedia summaries and Wikidata **P737** (influenced by)
+- Met Museum collection API
+- DuckDuckGo site-restricted search across TheArtStory, Met, Google Arts & Culture, NGA, Art Institute of Chicago, MoMA, Britannica, JSTOR, Oxford Art Online, WikiArt, and Wikipedia
+
+Discovered rows are stored with `confidence: discovered` and `discovered_via` (e.g. `wikipedia`, `wikidata`, `met`, `web:theartstory.org`). Period hints are inferred when the source text mentions influence during creation or a date range overlapping the work’s year.
+
+Extend `art-influences-data.js` for high-quality curated chains; use discovery to suggest additional artist and movement links for manual review.
 
 ## Movement lineage (frontend flow diagram)
 

Documentation/setup.md

@@ -111,8 +111,11 @@ Open http://localhost:3001 (or your configured `PORT`).
 | `npm run migrate:thumbnails` | `db/migrate-thumbnails.sql` | Add thumbnail columns |
 | `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 update-influences` | `scripts/update-influences.js` | Insert influence edges from `art-influences-data.js` |
+| `npm run migrate:influence-sources` | `scripts/migrate-influence-sources.js` | Create `painting_influence_sources` + backfill legacy edges |
+| `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) |
+| `npm run discover-influences` | `update-influences.js --discover-only` | Discovery pass only |
 
 ### Scripts in the repository
 
@@ -121,7 +124,8 @@ These are checked in and maintained:
 - `image-fetcher.js` — Wikimedia / museum image resolution
 - `fetch-artist-bios.js` — artist biographies
 - `expand-paintings.js` + `famous-paintings-data.js` — catalog expansion
-- `update-influences.js` + `art-influences-data.js` — painting influence graph
+- `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
 - `regenerate-thumbnails.js`, `audit-painting-images.js`
 
@@ -153,7 +157,7 @@ After clone: copy `.env.example` → `.env`, install dependencies, run `npm run
 | Wrong painting in 3D gallery frame | Stale or mismatched thumbnail file | `npm run regenerate-thumbnails`; gallery prefers full `image_path` |
 | Wrong painting image (fetch) | Bad museum / search match on first download | Add entry to `DIRECT_IMAGE_OVERRIDES` in `scripts/image-fetcher.js`, re-fetch file |
 | Empty exit navigation lists | No `painting_influences` edges for artist | `npm run update-influences` |
-| Empty *Influenced By* / *Influenced* on painting detail | No edges for that work | `npm run update-influences`; extend `art-influences-data.js` |
+| Empty *Influenced By* / *Influenced* on painting detail | No edges for that work | `npm run migrate:influence-sources` then `npm run update-influences`; extend `art-influences-data.js` or run `--discover` |
 | No golden lamps above frames in 3D hall | Stale API process or no influence edges | Restart server after API changes; run `npm run update-influences` |
 | 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 |

client/src/api/client.ts

@@ -46,6 +46,34 @@ export async function preloadArtistImages(artistId: number): Promise<{ fetched:
   return res.json();
 }
 
+export interface DebugImageSearchResult {
+  query: string;
+  imageUrl: string | null;
+  searchUrl: string;
+  source: string;
+  sourceLabel?: string;
+  thumbUrl?: string;
+}
+
+export interface PaintingCheckupRow {
+  id: number;
+  title: string;
+  artist_name: string;
+  year: number | null;
+  gallery_file: string | null;
+  gallery_preview: string | null;
+  detail_file: string;
+  detail_preview: string | null;
+  detail_on_demand: boolean;
+  gallery_file_exists: boolean;
+  detail_file_exists: boolean | null;
+}
+
+export interface PaintingCheckupData {
+  paintings: PaintingCheckupRow[];
+  total: number;
+}
+
 export const api = {
   getBounds: () => fetchJson<YearBounds>(`${API}/bounds`),
 
@@ -66,4 +94,26 @@ export const api = {
     fetchJson<ArtistNavigation>(`${API}/artists/${id}/navigation`),
 
   getPainting: (id: number) => fetchJson<PaintingDetail>(`${API}/paintings/${id}`),
+
+  getPaintingDebugImageSearch: (id: number) =>
+    fetchJson<DebugImageSearchResult>(`${API}/paintings/${id}/debug-image-search`),
+
+  fixPaintingImage: (id: number, imageUrl: string) =>
+    fetch(`${API}/paintings/${id}/fix-image`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ imageUrl }),
+    }).then(async (res) => {
+      if (!res.ok) {
+        const body = await res.json().catch(() => ({}));
+        throw new Error(body.error || `Fix failed: ${res.status}`);
+      }
+      return res.json() as Promise<{ imagePath: string; thumbnailPath: string }>;
+    }),
+
+  getPaintingCheckup: () => fetchJson<PaintingCheckupData>(`${API}/paintings/checkup`),
 };
+
+export function debugImageProxyUrl(imageUrl: string): string {
+  return `${API}/debug/image-proxy?url=${encodeURIComponent(imageUrl)}`;
+}

client/src/components/PaintingDetail.css

@@ -1,4 +1,5 @@
 .painting-detail {
+  position: relative;
   min-height: 100vh;
   background: linear-gradient(180deg, #1a1a2e 0%, #0f0f1a 100%);
   color: #e8d5b5;
@@ -164,6 +165,48 @@
   color: #c9a96e;
 }
 
+.influence-title-static {
+  cursor: default;
+}
+
+.influence-card-movement {
+  display: flex;
+  flex-direction: row;
+}
+
+.influence-movement-swatch {
+  width: 12px;
+  flex-shrink: 0;
+}
+
+.influence-card-artist .influence-portrait-btn img {
+  height: 120px;
+  object-fit: cover;
+  object-position: top center;
+}
+
+.influence-period {
+  font-size: 11px;
+  color: #a89070;
+  font-style: italic;
+  margin: 0;
+}
+
+.influence-discovered-tag {
+  font-size: 10px;
+  color: #7a6a55;
+  font-style: italic;
+}
+
+.influence-title-btn:disabled {
+  cursor: default;
+  opacity: 0.85;
+}
+
+.influence-image-btn:disabled {
+  cursor: default;
+}
+
 .influence-aspects {
   display: flex;
   flex-wrap: wrap;
@@ -366,6 +409,80 @@
   color: rgba(232, 213, 181, 0.85);
 }
 
+.debug-image-panel {
+  position: fixed;
+  left: 16px;
+  bottom: 16px;
+  z-index: 60;
+  width: min(280px, calc(100vw - 32px));
+  padding: 12px;
+  border-radius: 8px;
+  border: 1px solid rgba(232, 160, 64, 0.45);
+  background: rgba(15, 15, 26, 0.94);
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
+  font-family: ui-monospace, 'Cascadia Code', monospace;
+}
+
+.debug-image-panel h4 {
+  margin: 0 0 6px;
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+  color: #e8a040;
+}
+
+.debug-image-query {
+  margin: 0 0 8px;
+  font-size: 10px;
+  line-height: 1.4;
+  color: rgba(232, 213, 181, 0.75);
+  word-break: break-word;
+}
+
+.debug-image-preview {
+  display: block;
+  width: 100%;
+  max-height: 160px;
+  object-fit: contain;
+  background: #2a1f15;
+  border-radius: 4px;
+  margin-bottom: 8px;
+}
+
+.debug-fix-btn {
+  width: 100%;
+  padding: 8px 10px;
+  border: 1px solid #e8a040;
+  border-radius: 6px;
+  background: rgba(232, 160, 64, 0.15);
+  color: #e8a040;
+  font-size: 12px;
+  font-weight: 600;
+  cursor: pointer;
+}
+
+.debug-fix-btn:hover:not(:disabled) {
+  background: rgba(232, 160, 64, 0.28);
+}
+
+.debug-fix-btn:disabled {
+  opacity: 0.6;
+  cursor: wait;
+}
+
+.debug-image-status {
+  margin: 0;
+  font-size: 10px;
+  color: rgba(201, 169, 110, 0.7);
+}
+
+.debug-image-error {
+  margin: 0 0 8px;
+  font-size: 10px;
+  color: #ff8a80;
+}
+
 @media (max-width: 1024px) {
   .painting-layout {
     grid-template-columns: 1fr;

client/src/components/PaintingDetail.tsx

@@ -1,6 +1,6 @@
 import { useEffect, useState, type SyntheticEvent } from 'react';
-import type { Painting, PaintingDetail } from '../types';
+import type { InfluenceLink, Painting, PaintingDetail } from '../types';
-import { paintingImageUrl } from '../api/client';
+import { api, debugImageProxyUrl, imageUrl, paintingImageUrl, type DebugImageSearchResult } from '../api/client';
 import PaintingLightbox from './PaintingLightbox';
 import './PaintingDetail.css';
 
@@ -11,42 +11,43 @@ interface Props {
   onPaintingClick: (paintingId: number) => void;
   onCatalogNavigate: (paintingId: number) => void;
   onArtistBio: () => void;
+  onInfluenceArtistClick?: (artistId: number) => void;
+  debugMode?: boolean;
+  onPaintingImageFixed?: (paintingId: number) => void | Promise<void>;
+}
+
+function influenceKey(inf: InfluenceLink, index: number): string {
+  if (inf.source_type === 'movement') return `movement-${inf.movement_id ?? inf.movement_name}-${index}`;
+  if (inf.source_type === 'artist') return `artist-${inf.source_artist_id ?? inf.source_artist_name}-${index}`;
+  return `painting-${inf.id}-${index}`;
+}
+
+function periodLabel(inf: InfluenceLink): string | null {
+  if (inf.period_note) return inf.period_note;
+  if (inf.period_start_year != null && inf.period_end_year != null) {
+    return `${inf.period_start_year}–${inf.period_end_year}`;
+  }
+  if (inf.period_start_year != null) return `from ${inf.period_start_year}`;
+  return null;
 }
 
 function InfluenceCard({
   inf,
   onPaintingClick,
+  onInfluenceArtistClick,
 }: {
-  inf: PaintingDetail['influencedBy'][0];
+  inf: InfluenceLink;
   onPaintingClick: (id: number) => void;
+  onInfluenceArtistClick?: (artistId: number) => void;
 }) {
   const aspects = inf.aspects
     ? inf.aspects.split(',').map((a) => a.trim()).filter(Boolean)
     : [];
+  const period = periodLabel(inf);
+  const sourceType = inf.source_type || 'painting';
 
-  return (
+  const meta = (
-    <article className="influence-card-expanded">
+    <>
-      <button
-        type="button"
-        className="influence-image-btn"
-        onClick={() => onPaintingClick(inf.id)}
-        title={`View ${inf.title}`}
-      >
-        <img
-          src={paintingImageUrl({ id: inf.id, image_path: inf.image_path })}
-          alt={inf.title}
-          onError={(e) => {
-            (e.target as HTMLImageElement).src = '/placeholder-art.svg';
-          }}
-        />
-      </button>
-
-      <div className="influence-body">
-        <button type="button" className="influence-title-btn" onClick={() => onPaintingClick(inf.id)}>
-          <strong>{inf.title}</strong>
-          <span>{inf.artist_name}{inf.year ? `, ${inf.year}` : ''}</span>
-        </button>
-
       {aspects.length > 0 && (
         <div className="influence-aspects">
           {aspects.map((aspect) => (
@@ -54,9 +55,8 @@ function InfluenceCard({
           ))}
         </div>
       )}
-
+      {period && <p className="influence-period">{period}</p>}
       {inf.notes && <p className="influence-notes">{inf.notes}</p>}
-
       {inf.quote && (
         <blockquote className="influence-quote">
           <p>&ldquo;{inf.quote}&rdquo;</p>
@@ -68,7 +68,6 @@ function InfluenceCard({
           )}
         </blockquote>
       )}
-
       {inf.source_url && (
         <a
           className="influence-source-link"
@@ -80,6 +79,92 @@ function InfluenceCard({
           Read source: {inf.source_author || inf.source || 'Reference'}
         </a>
       )}
+      {inf.confidence === 'discovered' && inf.discovered_via && (
+        <span className="influence-discovered-tag">Discovered via {inf.discovered_via}</span>
+      )}
+    </>
+  );
+
+  if (sourceType === 'movement') {
+    return (
+      <article className="influence-card-expanded influence-card-movement">
+        <div
+          className="influence-movement-swatch"
+          style={{ background: inf.movement_color || '#8B7355' }}
+          aria-hidden
+        />
+        <div className="influence-body">
+          <div className="influence-title-btn influence-title-static">
+            <strong>{inf.movement_name}</strong>
+            <span>Art movement</span>
+          </div>
+          {meta}
+        </div>
+      </article>
+    );
+  }
+
+  if (sourceType === 'artist') {
+    const artistId = inf.source_artist_id;
+    const artistName = inf.source_artist_name || 'Unknown artist';
+    return (
+      <article className="influence-card-expanded influence-card-artist">
+        <button
+          type="button"
+          className="influence-image-btn influence-portrait-btn"
+          onClick={() => artistId && onInfluenceArtistClick?.(artistId)}
+          title={`View ${artistName}`}
+          disabled={!artistId || !onInfluenceArtistClick}
+        >
+          <img
+            src={imageUrl(inf.artist_portrait)}
+            alt={artistName}
+            onError={(e) => {
+              (e.target as HTMLImageElement).src = '/placeholder-portrait.svg';
+            }}
+          />
+        </button>
+        <div className="influence-body">
+          <button
+            type="button"
+            className="influence-title-btn"
+            onClick={() => artistId && onInfluenceArtistClick?.(artistId)}
+            disabled={!artistId || !onInfluenceArtistClick}
+          >
+            <strong>{artistName}</strong>
+            <span>Artist influence</span>
+          </button>
+          {meta}
+        </div>
+      </article>
+    );
+  }
+
+  if (!inf.id) return null;
+
+  return (
+    <article className="influence-card-expanded">
+      <button
+        type="button"
+        className="influence-image-btn"
+        onClick={() => onPaintingClick(inf.id!)}
+        title={`View ${inf.title}`}
+      >
+        <img
+          src={paintingImageUrl({ id: inf.id, image_path: inf.image_path })}
+          alt={inf.title || 'Painting'}
+          onError={(e) => {
+            (e.target as HTMLImageElement).src = '/placeholder-art.svg';
+          }}
+        />
+      </button>
+
+      <div className="influence-body">
+        <button type="button" className="influence-title-btn" onClick={() => onPaintingClick(inf.id!)}>
+          <strong>{inf.title}</strong>
+          <span>{inf.artist_name}{inf.year ? `, ${inf.year}` : ''}</span>
+        </button>
+        {meta}
       </div>
     </article>
   );
@@ -92,10 +177,19 @@ export default function PaintingDetailView({
   onPaintingClick,
   onCatalogNavigate,
   onArtistBio,
+  onInfluenceArtistClick,
+  debugMode = false,
+  onPaintingImageFixed,
 }: Props) {
   const { painting, influencedBy, influenced } = data;
   const [fullscreen, setFullscreen] = useState(false);
-  const imageSrc = paintingImageUrl(painting);
+  const [imageVersion, setImageVersion] = useState(0);
+  const [debugSearch, setDebugSearch] = useState<DebugImageSearchResult | null>(null);
+  const [debugLoading, setDebugLoading] = useState(false);
+  const [debugError, setDebugError] = useState<string | null>(null);
+  const [fixing, setFixing] = useState(false);
+
+  const imageSrc = `${paintingImageUrl(painting)}${paintingImageUrl(painting).includes('?') ? '&' : '?'}v=${imageVersion}`;
 
   const catalogIndex = artistPaintings.findIndex((p) => p.id === painting.id);
   const previousPainting = catalogIndex > 0 ? artistPaintings[catalogIndex - 1] : null;
@@ -107,8 +201,52 @@ export default function PaintingDetailView({
 
   useEffect(() => {
     setFullscreen(false);
+    setImageVersion(0);
   }, [painting.id]);
 
+  useEffect(() => {
+    if (!debugMode) {
+      setDebugSearch(null);
+      setDebugError(null);
+      return;
+    }
+
+    let cancelled = false;
+    setDebugLoading(true);
+    setDebugError(null);
+    setDebugSearch(null);
+
+    api.getPaintingDebugImageSearch(painting.id)
+      .then((result) => {
+        if (!cancelled) setDebugSearch(result);
+      })
+      .catch(() => {
+        if (!cancelled) setDebugError('Google image search failed.');
+      })
+      .finally(() => {
+        if (!cancelled) setDebugLoading(false);
+      });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [debugMode, painting.id, painting.title, painting.artist_name]);
+
+  const handleFixImage = async () => {
+    if (!debugSearch?.imageUrl || fixing) return;
+    setFixing(true);
+    setDebugError(null);
+    try {
+      await api.fixPaintingImage(painting.id, debugSearch.imageUrl);
+      setImageVersion((v) => v + 1);
+      await onPaintingImageFixed?.(painting.id);
+    } catch (err) {
+      setDebugError(err instanceof Error ? err.message : 'Could not replace image.');
+    } finally {
+      setFixing(false);
+    }
+  };
+
   useEffect(() => {
     if (fullscreen) return;
 
@@ -159,8 +297,13 @@ export default function PaintingDetailView({
             <p className="no-influences">No documented influences for this work.</p>
           ) : (
             <div className="influence-list">
-              {influencedBy.map((inf) => (
+              {influencedBy.map((inf, index) => (
-                <InfluenceCard key={inf.id} inf={inf} onPaintingClick={onPaintingClick} />
+                <InfluenceCard
+                  key={influenceKey(inf, index)}
+                  inf={inf}
+                  onPaintingClick={onPaintingClick}
+                  onInfluenceArtistClick={onInfluenceArtistClick}
+                />
               ))}
             </div>
           )}
@@ -226,14 +369,53 @@ export default function PaintingDetailView({
             <p className="no-influences">No documented works influenced by this painting yet.</p>
           ) : (
             <div className="influence-list">
-              {influenced.map((inf) => (
+              {influenced.map((inf, index) => (
-                <InfluenceCard key={inf.id} inf={inf} onPaintingClick={onPaintingClick} />
+                <InfluenceCard
+                  key={influenceKey(inf, index)}
+                  inf={inf}
+                  onPaintingClick={onPaintingClick}
+                  onInfluenceArtistClick={onInfluenceArtistClick}
+                />
               ))}
             </div>
           )}
         </aside>
       </div>
 
+      {debugMode && (
+        <aside className="debug-image-panel" aria-label="Debug image search">
+          <h4>{debugSearch?.sourceLabel ?? 'Google image search'}</h4>
+          <p className="debug-image-query">
+            {debugSearch?.query ?? `${painting.artist_name} ${painting.title} painting`}
+          </p>
+          {debugLoading && <p className="debug-image-status">Searching…</p>}
+          {debugError && <p className="debug-image-error">{debugError}</p>}
+          {!debugLoading && debugSearch?.imageUrl && (
+            <>
+              <img
+                className="debug-image-preview"
+                src={debugImageProxyUrl(debugSearch.imageUrl)}
+                alt={`Google search result for ${debugSearch.query}`}
+                onError={(e) => {
+                  (e.target as HTMLImageElement).src = '/placeholder-art.svg';
+                }}
+              />
+              <button
+                type="button"
+                className="debug-fix-btn"
+                onClick={handleFixImage}
+                disabled={fixing}
+              >
+                {fixing ? 'Replacing…' : 'Fix it'}
+              </button>
+            </>
+          )}
+          {!debugLoading && debugSearch && !debugSearch.imageUrl && !debugError && (
+            <p className="debug-image-status">No Google image result found.</p>
+          )}
+        </aside>
+      )}
+
       {fullscreen && (
         <PaintingLightbox
           src={imageSrc}

client/src/pages/CheckupPage.css

@@ -0,0 +1,213 @@
+.checkup-page {
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  background: linear-gradient(180deg, #0f0f1a 0%, #1a1a2e 40%, #16213e 100%);
+  color: #e8d5b5;
+}
+
+.checkup-header {
+  display: flex;
+  align-items: flex-start;
+  gap: 16px;
+  padding: 20px 24px 12px;
+  border-bottom: 1px solid rgba(201, 169, 110, 0.25);
+  flex-shrink: 0;
+}
+
+.checkup-back-btn {
+  padding: 8px 14px;
+  border: 1px solid rgba(201, 169, 110, 0.35);
+  border-radius: 6px;
+  background: rgba(15, 15, 26, 0.85);
+  color: #c9a96e;
+  font-size: 13px;
+  cursor: pointer;
+  flex-shrink: 0;
+}
+
+.checkup-back-btn:hover {
+  border-color: #c9a96e;
+  color: #e8d5b5;
+}
+
+.checkup-title-block h1 {
+  margin: 0;
+  font-family: 'Georgia', serif;
+  font-size: 26px;
+  color: #e8d5b5;
+}
+
+.checkup-title-block p {
+  margin: 6px 0 0;
+  font-size: 13px;
+  color: rgba(201, 169, 110, 0.65);
+}
+
+.checkup-toolbar {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 12px 20px;
+  padding: 12px 24px;
+  flex-shrink: 0;
+}
+
+.checkup-filter {
+  flex: 1;
+  min-width: 220px;
+  max-width: 420px;
+  padding: 8px 12px;
+  border-radius: 6px;
+  border: 1px solid rgba(201, 169, 110, 0.3);
+  background: rgba(15, 15, 26, 0.9);
+  color: #e8d5b5;
+  font-size: 13px;
+}
+
+.checkup-stats {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 10px 16px;
+  font-size: 11px;
+  font-family: ui-monospace, 'Cascadia Code', monospace;
+  color: rgba(201, 169, 110, 0.7);
+}
+
+.checkup-error {
+  margin: 0 24px 12px;
+  padding: 10px 14px;
+  border-radius: 6px;
+  background: rgba(139, 0, 0, 0.3);
+  border: 1px solid rgba(255, 100, 100, 0.4);
+  color: #ffaaaa;
+}
+
+.checkup-loading {
+  padding: 48px;
+  text-align: center;
+  color: rgba(201, 169, 110, 0.6);
+  font-family: 'Georgia', serif;
+}
+
+.checkup-table-wrap {
+  flex: 1;
+  min-height: 0;
+  overflow: auto;
+  padding: 0 24px 24px;
+}
+
+.checkup-table {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 13px;
+}
+
+.checkup-table thead {
+  position: sticky;
+  top: 0;
+  z-index: 1;
+}
+
+.checkup-table th {
+  text-align: left;
+  padding: 10px 12px;
+  background: rgba(26, 26, 46, 0.98);
+  border-bottom: 2px solid rgba(201, 169, 110, 0.35);
+  color: #c9a96e;
+  font-weight: 600;
+  font-size: 12px;
+  white-space: nowrap;
+}
+
+.checkup-table td {
+  padding: 10px 12px;
+  border-bottom: 1px solid rgba(201, 169, 110, 0.12);
+  vertical-align: middle;
+}
+
+.checkup-thumb-cell {
+  width: 200px;
+}
+
+.checkup-thumb {
+  position: relative;
+  width: 180px;
+  height: 140px;
+  border-radius: 6px;
+  overflow: hidden;
+  background: #2a1f15;
+  border: 1px solid rgba(201, 169, 110, 0.25);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.checkup-thumb img {
+  width: 100%;
+  height: 100%;
+  object-fit: contain;
+  display: block;
+}
+
+.checkup-thumb-empty {
+  flex-direction: column;
+  gap: 4px;
+  color: rgba(201, 169, 110, 0.45);
+  font-size: 12px;
+  text-align: center;
+}
+
+.checkup-thumb-empty small {
+  font-size: 10px;
+  opacity: 0.75;
+}
+
+.checkup-thumb-missing {
+  border-color: rgba(255, 138, 128, 0.45);
+}
+
+.checkup-thumb-badge {
+  position: absolute;
+  left: 6px;
+  bottom: 6px;
+  padding: 2px 6px;
+  border-radius: 4px;
+  background: rgba(15, 15, 26, 0.88);
+  border: 1px solid rgba(255, 138, 128, 0.45);
+  font-size: 9px;
+  font-family: ui-monospace, 'Cascadia Code', monospace;
+  color: #ff8a80;
+  text-transform: uppercase;
+  letter-spacing: 0.03em;
+}
+
+.checkup-thumb-badge-api {
+  border-color: rgba(158, 197, 232, 0.45);
+  color: #9ec5e8;
+}
+
+.checkup-table tbody tr:hover {
+  background: rgba(201, 169, 110, 0.06);
+}
+
+.checkup-year {
+  white-space: nowrap;
+  color: rgba(232, 213, 181, 0.85);
+}
+
+.checkup-title-link {
+  background: none;
+  border: none;
+  padding: 0;
+  color: #e8d5b5;
+  font: inherit;
+  text-align: left;
+  cursor: pointer;
+  text-decoration: underline;
+  text-decoration-color: rgba(201, 169, 110, 0.35);
+}
+
+.checkup-title-link:hover {
+  color: #c9a96e;
+}

client/src/pages/CheckupPage.tsx

@@ -0,0 +1,193 @@
+import { useEffect, useMemo, useState } from 'react';
+import { api, type PaintingCheckupRow } from '../api/client';
+import './CheckupPage.css';
+
+interface Props {
+  onBack: () => void;
+  onOpenPainting?: (paintingId: number) => void;
+}
+
+function previewSrc(row: PaintingCheckupRow, kind: 'gallery' | 'detail'): string | null {
+  if (kind === 'gallery') {
+    const file = row.gallery_preview ?? row.gallery_file;
+    return file ? `/images/${file}` : null;
+  }
+  if (row.detail_on_demand) {
+    return `/api/paintings/${row.id}/image?size=thumb`;
+  }
+  const file = row.detail_preview ?? row.detail_file;
+  return file ? `/images/${file}` : null;
+}
+
+function ImagePreviewCell({
+  row,
+  kind,
+}: {
+  row: PaintingCheckupRow;
+  kind: 'gallery' | 'detail';
+}) {
+  const path = kind === 'gallery' ? row.gallery_file : row.detail_file;
+  const src = previewSrc(row, kind);
+  const exists =
+    kind === 'gallery' ? row.gallery_file_exists : row.detail_file_exists;
+  const missing = path && exists === false;
+
+  if (!path) {
+    return (
+      <div className="checkup-thumb checkup-thumb-empty">
+        <span>No image</span>
+        <small>Hidden in 3D</small>
+      </div>
+    );
+  }
+
+  return (
+    <div className={`checkup-thumb${missing ? ' checkup-thumb-missing' : ''}`}>
+      {src && (
+        <img
+          src={src}
+          alt=""
+          loading="lazy"
+          decoding="async"
+          title={path}
+          onError={(e) => {
+            (e.target as HTMLImageElement).src = '/placeholder-art.svg';
+          }}
+        />
+      )}
+      {missing && <span className="checkup-thumb-badge">missing file</span>}
+      {row.detail_on_demand && kind === 'detail' && (
+        <span className="checkup-thumb-badge checkup-thumb-badge-api">on-demand</span>
+      )}
+    </div>
+  );
+}
+
+export default function CheckupPage({ onBack, onOpenPainting }: Props) {
+  const [rows, setRows] = useState<PaintingCheckupRow[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [filter, setFilter] = useState('');
+
+  useEffect(() => {
+    let cancelled = false;
+    setLoading(true);
+    api.getPaintingCheckup()
+      .then((data) => {
+        if (!cancelled) {
+          setRows(data.paintings);
+          setError(null);
+        }
+      })
+      .catch(() => {
+        if (!cancelled) setError('Could not load checkup data. Is the server running?');
+      })
+      .finally(() => {
+        if (!cancelled) setLoading(false);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, []);
+
+  const filtered = useMemo(() => {
+    const q = filter.trim().toLowerCase();
+    if (!q) return rows;
+    return rows.filter(
+      (row) =>
+        row.title.toLowerCase().includes(q) ||
+        row.artist_name.toLowerCase().includes(q) ||
+        String(row.year ?? '').includes(q) ||
+        (row.gallery_file ?? '').toLowerCase().includes(q) ||
+        row.detail_file.toLowerCase().includes(q)
+    );
+  }, [rows, filter]);
+
+  const stats = useMemo(() => {
+    const noGallery = rows.filter((r) => !r.gallery_file).length;
+    const onDemand = rows.filter((r) => r.detail_on_demand).length;
+    const missingGallery = rows.filter((r) => r.gallery_file && !r.gallery_file_exists).length;
+    const missingDetail = rows.filter(
+      (r) => r.detail_file_exists === false
+    ).length;
+    return { noGallery, onDemand, missingGallery, missingDetail };
+  }, [rows]);
+
+  return (
+    <div className="checkup-page">
+      <header className="checkup-header">
+        <button type="button" className="checkup-back-btn" onClick={onBack}>
+          ← Back to timeline
+        </button>
+        <div className="checkup-title-block">
+          <h1>Painting checkup</h1>
+          <p>Compare image files used in the 3D gallery vs painting detail view.</p>
+        </div>
+      </header>
+
+      <div className="checkup-toolbar">
+        <input
+          type="search"
+          className="checkup-filter"
+          placeholder="Filter by title, artist, year…"
+          value={filter}
+          onChange={(e) => setFilter(e.target.value)}
+        />
+        <div className="checkup-stats">
+          <span>{filtered.length} shown</span>
+          <span>{stats.noGallery} no gallery file</span>
+          <span>{stats.onDemand} detail on-demand</span>
+          <span>{stats.missingGallery} gallery missing</span>
+          <span>{stats.missingDetail} detail missing</span>
+        </div>
+      </div>
+
+      {error && <div className="checkup-error">{error}</div>}
+
+      {loading ? (
+        <div className="checkup-loading">Loading paintings…</div>
+      ) : (
+        <div className="checkup-table-wrap">
+          <table className="checkup-table">
+            <thead>
+              <tr>
+                <th>Painting</th>
+                <th>Artist</th>
+                <th>Year</th>
+                <th>Gallery</th>
+                <th>Detail</th>
+              </tr>
+            </thead>
+            <tbody>
+              {filtered.map((row) => (
+                <tr key={row.id}>
+                  <td>
+                    {onOpenPainting ? (
+                      <button
+                        type="button"
+                        className="checkup-title-link"
+                        onClick={() => onOpenPainting(row.id)}
+                      >
+                        {row.title}
+                      </button>
+                    ) : (
+                      row.title
+                    )}
+                  </td>
+                  <td>{row.artist_name}</td>
+                  <td className="checkup-year">{row.year ?? '—'}</td>
+                  <td className="checkup-thumb-cell">
+                    <ImagePreviewCell row={row} kind="gallery" />
+                  </td>
+                  <td className="checkup-thumb-cell">
+                    <ImagePreviewCell row={row} kind="detail" />
+                  </td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        </div>
+      )}
+    </div>
+  );
+}

client/src/pages/HomePage.css

@@ -32,6 +32,45 @@
   text-align: center;
   padding: 24px 16px 8px;
   flex-shrink: 0;
+  position: relative;
+}
+
+.site-dev-tools {
+  position: absolute;
+  top: 16px;
+  right: 16px;
+  display: flex;
+  gap: 8px;
+  align-items: center;
+}
+
+.debug-mode-toggle,
+.checkup-link-btn {
+  padding: 6px 12px;
+  border-radius: 6px;
+  border: 1px solid rgba(201, 169, 110, 0.35);
+  background: rgba(15, 15, 26, 0.85);
+  color: rgba(201, 169, 110, 0.75);
+  font-size: 12px;
+  font-family: ui-monospace, 'Cascadia Code', monospace;
+  cursor: pointer;
+  transition: background 0.2s, border-color 0.2s, color 0.2s;
+}
+
+.debug-mode-toggle:hover,
+.checkup-link-btn:hover {
+  border-color: #c9a96e;
+  color: #e8d5b5;
+}
+
+.debug-mode-toggle-active {
+  border-color: #e8a040;
+  background: rgba(232, 160, 64, 0.15);
+  color: #e8a040;
+}
+
+.checkup-link-btn {
+  text-decoration: none;
 }
 
 .site-header h1 {

client/src/pages/HomePage.tsx

@@ -4,13 +4,16 @@ import MovementBands from '../components/MovementBands';
 import VirtualGallery from '../components/VirtualGallery';
 import PaintingDetailView from '../components/PaintingDetail';
 import ArtistBio from '../components/ArtistBio';
+import CheckupPage from '../pages/CheckupPage';
 import { api } from '../api/client';
 import type { TimelineData, Artist, ArtistDetail, Painting, PaintingDetail } from '../types';
 import { sortArtistPaintingsChronological } from '../utils/paintingUtils';
+import { readDebugMode, writeDebugMode } from '../utils/debugMode';
 import './HomePage.css';
 
 type View =
   | { type: 'timeline' }
+  | { type: 'checkup' }
   | { type: 'gallery'; artistId: number; data: ArtistDetail }
   | { type: 'painting'; paintingId: number; data: PaintingDetail; returnTo: View }
   | { type: 'bio'; artistId: number; data: ArtistDetail; returnTo: View };
@@ -28,6 +31,7 @@ export default function HomePage() {
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
   const [detailArtistPaintings, setDetailArtistPaintings] = useState<Painting[]>([]);
+  const [debugMode, setDebugMode] = useState(readDebugMode);
   const detailReturnToRef = useRef<View>({ type: 'timeline' });
 
   useEffect(() => {
@@ -76,6 +80,51 @@ export default function HomePage() {
     setViewEnd(end);
   };
 
+  const toggleDebugMode = () => {
+    setDebugMode((prev) => {
+      const next = !prev;
+      writeDebugMode(next);
+      return next;
+    });
+  };
+
+  const handlePaintingImageFixed = useCallback(async (paintingId: number) => {
+    const data = await api.getPainting(paintingId);
+    setView((current) =>
+      current.type === 'painting' && current.paintingId === paintingId
+        ? { ...current, data }
+        : current
+    );
+    setDetailArtistPaintings((list) =>
+      list.map((p) =>
+        p.id === paintingId
+          ? { ...p, image_path: data.painting.image_path, thumbnail_path: data.painting.thumbnail_path }
+          : p
+      )
+    );
+    if (gallerySession?.artistId === data.painting.artist_id) {
+      setGallerySession((session) =>
+        session
+          ? {
+              ...session,
+              data: {
+                ...session.data,
+                paintings: session.data.paintings.map((p) =>
+                  p.id === paintingId
+                    ? {
+                        ...p,
+                        image_path: data.painting.image_path,
+                        thumbnail_path: data.painting.thumbnail_path,
+                      }
+                    : p
+                ),
+              },
+            }
+          : session
+      );
+    }
+  }, [gallerySession]);
+
   const handleArtistClick = async (artistId: number) => {
     try {
       const data = await api.getArtist(artistId);
@@ -182,6 +231,9 @@ export default function HomePage() {
               const artistData = await api.getArtist(view.data.painting.artist_id);
               setView({ type: 'bio', artistId: artistData.artist.id, data: artistData, returnTo: view });
             }}
+            onInfluenceArtistClick={handleArtistClick}
+            debugMode={debugMode}
+            onPaintingImageFixed={handlePaintingImageFixed}
           />
         </div>
       )}
@@ -198,9 +250,34 @@ export default function HomePage() {
         </div>
       )}
 
+      {view.type === 'checkup' && (
+        <CheckupPage
+          onBack={() => setView({ type: 'timeline' })}
+          onOpenPainting={handlePaintingClick}
+        />
+      )}
+
       {view.type === 'timeline' && (
         <div className="home-page">
           <header className="site-header">
+            <div className="site-dev-tools">
+              <button
+                type="button"
+                className={`debug-mode-toggle${debugMode ? ' debug-mode-toggle-active' : ''}`}
+                onClick={toggleDebugMode}
+                title="Toggle developer image audit mode on painting details"
+              >
+                Debug mode{debugMode ? ': ON' : ''}
+              </button>
+              <button
+                type="button"
+                className="checkup-link-btn"
+                onClick={() => setView({ type: 'checkup' })}
+                title="Open painting image checkup table"
+              >
+                Checkup
+              </button>
+            </div>
             <h1>Virtual Art Gallery</h1>
             <p className="site-subtitle">Watch art movements branch forward through time — each flowing from what came before</p>
           </header>

client/src/types/index.ts

@@ -63,19 +63,33 @@ export interface Painting {
   has_influence_links?: boolean | string | number;
 }
 
+export type InfluenceSourceType = 'painting' | 'artist' | 'movement';
+
 export interface InfluenceLink {
-  notes: string;
+  source_type: InfluenceSourceType;
-  source: string;
+  notes?: string;
+  source?: string;
   aspects?: string;
   quote?: string;
   source_author?: string;
   source_url?: string;
-  id: number;
+  confidence?: string;
-  title: string;
+  discovered_via?: string;
-  year: number;
+  period_note?: string;
-  image_path: string;
+  period_start_year?: number | null;
-  artist_name: string;
+  period_end_year?: number | null;
-  artist_id: number;
+  id?: number;
+  title?: string;
+  year?: number | null;
+  image_path?: string | null;
+  artist_name?: string;
+  artist_id?: number;
+  source_artist_id?: number;
+  source_artist_name?: string;
+  artist_portrait?: string | null;
+  movement_id?: number;
+  movement_name?: string;
+  movement_color?: string;
 }
 
 export interface PaintingDetail {

client/src/utils/debugMode.ts

@@ -0,0 +1,17 @@
+const DEBUG_MODE_KEY = 'gallery-debug-mode';
+
+export function readDebugMode(): boolean {
+  try {
+    return localStorage.getItem(DEBUG_MODE_KEY) === '1';
+  } catch {
+    return false;
+  }
+}
+
+export function writeDebugMode(enabled: boolean): void {
+  try {
+    localStorage.setItem(DEBUG_MODE_KEY, enabled ? '1' : '0');
+  } catch {
+    // ignore
+  }
+}