bvandeusenandClaude Opus 5
cf7b489fec
android / Build + lint + test (push) Successful in 4m4s
`refreshDetail` did an un-transacted `deleteByPlaylist` + `upsertAll` — the same shape as the Home index write that #2327 just fixed. Room's InvalidationTracker fires after the DELETE, so an observer of `observeByPlaylist` would see `emptyList()` before the new rows land, which is exactly what made every Home row visibly collapse to empty and refill. Nothing consumes `observeByPlaylist` today, so this is not a live defect — it's a landmine. Making playlist detail cache-first later would have silently reintroduced the flicker, and the reason would have been three layers away from the symptom. One `@Transaction` now costs nothing and removes that. `deleteByPlaylist` is left in place as the building block but is no longer called from outside the DAO. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>