Marcel 0bb18c6789 feat(backend): add thumbnailExecutor bean for isolated thumbnail workload
Dedicated thread pool (core=1, max=2, queue=200) with CallerRunsPolicy
for back-pressure. Keeps thumbnail rendering off the shared taskExecutor
used by OCR and out of the AbortPolicy queue that drops work on overflow.
Quick-upload batches (15+ files) now apply back-pressure instead of
silently dropping thumbnail jobs.

Refs #307

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-04-22 21:42:05 +02:00
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