Will Miao a256558a0e fix(downloads): delete history entries on retry and add dedup for bug #980 ...

- retry_from_history() and retry_all_failed() now DELETE the original
  history entry after re-queuing it. Previously the old entry stayed
  in history causing exponential growth on repeated retry→cancel→retry
  cycles.
- Add deduplicate() called once on singleton creation to clean up
  existing duplicate queue/history entries left by the bug:
  1. In-status dedup (keep highest id per model+version+status)
  2. Cross-status dedup (prefer completed > failed > canceled)
  3. Queue dedup (keep highest rowid per model+version)
  4. Orphan queue cleanup (source='retry' entries obsoleted by
     terminal history entries)

2026-06-14 22:52:44 +08:00

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