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Fix race condition in thumbnail candidate generation

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Concurrent requests for the same course's thumbnail (e.g. the
Precompute background scan overlapping an ordinary page load) shared
fixed candidate filenames, so one request's cleanup could delete a
temp file the other was still using, crashing with ENOENT. Candidate
filenames are now unique per call.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
rmsitz
2026-08-24 20:27:08 -04:00
co-authored by Claude Sonnet 5
parent 36d9e7f89b
commit de9c05d0d0
3 changed files with 8 additions and 2 deletions
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2026-08-25 00:20 UTC — autoplay, progress rings, duplicate lessons, title-card thumbnails
2026-08-25 00:26 UTC — fix race condition in thumbnail candidate generation