Mattias Thall bbf7cc939b Overhaul For You feed ranking and freshness ...

Ranking improvements:
- Wider candidate pool (4x limit) with ±12pt score perturbation so
  same-score videos shuffle differently each load
- Recent channel engagement signal: channels watched in past 30 days
  get a +4pts/watch boost
- Bail penalty: -25pts for videos started but abandoned before 20%
- Impression penalty: -3pts per prior feed appearance (capped at 10),
  so repeatedly-skipped videos sink naturally
- rn cap raised to 5 for more candidates; Python-side sampling picks top limit

Feed UX:
- Reshuffle button now available on For You (ranked) mode, not just Explore
- shuffleKey now always included in query key (not just random mode)
- Ranked mode staleTime reduced from 10min to 90s

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-27 01:14:10 +02:00

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