- C-01: Wrap accept flow flush/commit in IntegrityError handling (409) - C-02: Use separate remote_timestamps dict instead of pop() on shared profile - W-01: Add birthday sync in Link conversion path (existing person → umbral) - W-02: Add None guard on max(updated_at) comparison in get_person Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>