Marcel a2333975f9 feat(backend): add THUMBNAIL_BACKFILL_ALREADY_RUNNING error code
Mirrors the IMPORT_ALREADY_RUNNING pattern for the concurrent-start
guard in ThumbnailBackfillService.

Refs #307

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-04-22 21:36:06 +02:00
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