## Investigation Summary Investigated the identifier sync issue. The bug was **already fixed** in commit `0496aed`: The previous code blocked identifier updates by including "identifier" in the non_updateable set in server/routes/sync.py. The fix removed identifier from that set. ## Verification 1. Production server (gateway@gateway) is at commit adc78b8 which includes the fix 2. Added 4 new tests to verify identifier sync works 3. All 77 sync/cross-validation tests pass ## Files Changed - tests/test_sync_e2e.py: Added E2E test for identifier update sync - tests/test_cross_validation.py: Added CLI-to-server identifier tests - tests/integration/test_crudl_sync.py: Added integration test The issue was reported before the fix was committed (issue: 2026-01-01T00:19 PST, fix: 2026-01-01T17:00 PST).