restore-original's precheck (existing.original_image_path === null) and restoreImageOriginal's own guard (WHERE ... AND original_image_path IS NOT NULL) could disagree under a race: two concurrent restores, or a rapid double-click, could both pass the precheck before either commits, and the loser's UPDATE would then match zero rows and throw. The handler had no try/catch around that call, so the throw propagated through asyncRoute to the app-level error handler and the caller got a bare 500, breaking the route's documented 200 | 404 contract even though the row itself was left correct.
Wraps the restoreImageOriginal call in a try/catch, matching the shape remove-background already uses in this file, but answering 404 rather than 502: losing this race means another admin already finished the restore, not that a downstream service failed. Adds a comment on the catch explaining why it exists, and a test that fires two restores concurrently and asserts neither comes back 500.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
bermudalambandClaude Opus 5
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