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ersatztv/ErsatzTV/Services
timothyandClaude Opus 4.8 702b0121cd
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fix(review): bounded scan-pending net + scheduler compensating unlock (#232)
Adversarial review (fork + Codex, both flagged) of PR #241:

- SPA (both reviewers): removing PENDING_GRACE_TICKS wholesale reintroduced a
  stuck scan button. A 202'd scan that finishes between 10s polls (short/empty
  library) is never observed active, so its optimistic pending flag wedged the
  button disabled until reload. Restore a BOUNDED grace net (pruneGraceExpiredPending)
  — re-scoped honestly: it absorbs the inherent queue->observed-active lag and the
  fast-completion race, NOT the removed lying-200 compensation (the POST now returns
  409/404/422 honestly). Bounds pending to PENDING_GRACE_TICKS * pollMs (~30s).

- SPA 409 (Codex): on "already scanning" the button was cleared+reconciled, but a
  scan-status still lagging the in-progress scan re-enabled the button and let the
  user fire repeated 409s. Keep the pending flag on 409 (no toast) so the button
  stays disabled; polling promotes or expires it.

- Scheduler (Codex): the Plex-Shows tail-token batch and the local/Jellyfin/Emby
  scan enqueues had no compensating unlock — a WriteAsync failure after LockLibrary
  (cancellation on shutdown) stranded the library lock. Wrap each acquired-lock
  enqueue in try/catch → UnlockLibrary → rethrow (the Plex catch covers both writes,
  since the library message carries Unlock: false and the un-enqueued networks
  message was the sole releaser).

Tests: two new App.test.tsx cases — grace-window expiry re-enables the button, and
409 keeps it disabled through the queue->active lag.

Ref #232.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-11 12:54:48 +02:00
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