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Activities: lookback_days was ignored once last_sync_at was set (since always took priority). Now lookback_days always sets the window; -1 is all-time on first sync then incremental. Wellness: lookback_days was never passed to sync_wellness at all — hardcoded 90-day cap regardless of settings. Fixed by adding lookback_days param and wiring it through from the Celery task. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>