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  feat(discovery): per-channel caption-availability memory (ADR-024)

  mathias released this 2026-06-10 18:27:25 +00:00 | 43 commits to main since this release

  After transcript caching (ADR-021) and the Shorts filter (ADR-023), the remaining
  caption waste is the first fetch on every new video of a channel that never has
  English captions — each costs one rate-limited fetch to resolve to "none", and on
  a throttled IP churns the backoff machinery first.

  Remember, per (user, channel), a streak of consecutive no-caption outcomes
  (channel_caption_state, migration 016, RLS-scoped). Once it reaches
  TAPIR_CHANNEL_CAPTIONLESS_THRESHOLD (default 5) the channel is suppressed — videos
  discovered/listed but not caption-fetched — for TAPIR_CHANNEL_CAPTIONLESS_WINDOW
  (default 14d), then one is re-probed (auto-recovery). A successful fetch resets
  the streak; a 429 does not count; an explicit manual request bypasses suppression.
  threshold=0 disables.

  Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

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