ebb425388c
- Added ExecInTransaction helper for atomic database operations - Added IsUniqueConstraintError to detect UNIQUE constraint violations - Wrapped RemapCollisions with retry logic (3 attempts with counter sync) - Enhanced handleRename to detect race conditions where target ID exists - Added defensive checks for when old ID has been deleted by another clone Progress: Improves N-way collision handling, though full solution requires more work (tracked in bd-108). Tests now reach later convergence rounds before hitting complex collision scenarios. Amp-Thread-ID: https://ampcode.com/threads/T-2b850a80-f8bd-4e38-b661-e33d1cfa7281 Co-authored-by: Amp <amp@ampcode.com>