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Two cadences for keeping heads in sync with your tagging: - PASSIVE: a nightly `scheduled_train_heads` beat (skips if a run is already in flight; creates+commits the run row before dispatching train_heads so the ml worker always finds it). Folds the day's accepts/rejects + newly-eligible concepts into the heads without anyone clicking. - ACTIVE: a "Retrain heads" button in the Explore trail bar — bank the +/- feedback you just gave while walking content, without a trip to Settings. Shared logic in a new useHeadTraining composable (trigger + poll + start/finish toasts), used by the Explore button; reflects an already-running run (incl. the nightly one) on mount. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Ttrj5P7upUTueSfoJcxEqa