# F-060 — Implementer evidence

## Scope delivered

`scripts/generate-thumbnails.sh` was lagging behind the new resize contract
introduced by F-059. It used `sharp().resize({ width: size, withoutEnlargement: true })`
with no max-height cap, and it skipped already cached files. After F-059 the
on-demand path (upload route, dynamic `/uploads/[...path]/route.ts` in all
three apps) produces `fit: 'inside'` thumbnails bounded by `width * 1.4` height.
Running the batch script did nothing for existing files — which meant the
admin/frontend/storefront public uploads still held the legacy shape.

## Changes

### `project/scripts/generate-thumbnails.mjs`

Two adjustments to keep the batch script aligned with the on-demand path:

1. **Resize contract** — same `fit: 'inside'` and `MAX_HEIGHT_RATIO = 1.4`
   bound as the upload route:

   ```js
   const maxHeight = Math.round(size * MAX_HEIGHT_RATIO);
   await sharp(src)
     .resize({ width: size, height: maxHeight, fit: 'inside', withoutEnlargement: true })
     .jpeg({ quality: 80 })
     .toFile(thumbPath);
   ```

2. **`FORCE` flag** — `FORCE=1` (or `FORCE=true`) skips the cache-skip
   logic, so the script can regenerate thumbnails in place without deleting
   the existing files first. Default behaviour (skip existing) is preserved
   for normal cron runs.

```bash
FORCE=1 ./scripts/generate-thumbnails.sh
```

## Acceptance traceability

| Acceptance criterion | How it is met |
| -------------------- | ------------- |
| Script uses `fit: 'inside'` with `maxHeight = size × 1.4` | Source updated, line-by-line equivalent to the upload route. |
| `FORCE` flag regenerates existing cached thumbnails | New env var read at startup, controls the skip block. |
| All cached thumbnails now use the new bounded-box behaviour matching upload route | After `FORCE=1 ./scripts/generate-thumbnails.sh`: 42 thumbnails regenerated (7 images × 2 sizes × 3 apps). On-disk dimensions verified with `file`. |
| Non-square source thumbnails are not cropped | 600×800 source produces 40×53 and 200×267 (aspect 3:4 preserved). 800×800 source produces 40×40 and 200×200. 1×1 sources stay 1×1 (`withoutEnlargement` is intentional). |
| `verify.sh` is green | Exit 0. |

## Manual verification

```
$ FORCE=1 ./scripts/generate-thumbnails.sh
[INFO] Found 7 source images
[OK] Processed 7 images, generated 42 new thumbnails

$ file project/{apps/admin,frontend,storefront}/public/uploads/40/*.jpg
… 2616a0de-… → 40x53
… 7f0a005a-… → 40x40
… 8223b962-… → 40x40
… a7e3aa30-… → 1x1   (source is 1x1; withoutEnlargement prevents upscale)
… bd8fe585-… → 40x40
… d04dc789-… → 1x1   (source is 1x1)
… fa7a31db-… → 40x53
```

```
$ curl /uploads/40/2616a0de-… | file -
/dev/stdin: JPEG image data, baseline, precision 8, 40x53, components 3
```

## Build verification

- `./scripts/verify.sh` — exit 0
- All four services restarted via `monolith.sh prod restart`, all 200
- `/uploads/40/...` and `/uploads/200/...` reachable from admin, frontend,
  storefront (HTTP 200)

## Files touched

```
project/scripts/generate-thumbnails.mjs (modified)
```