Kian Jones 0d42afa151 fix(core): catch LockNotAvailableError and return 409 instead of 500 (#9359) ...

Re-apply changes on top of latest main to resolve merge conflicts.

- Add DatabaseLockNotAvailableError custom exception in orm/errors.py
- Catch asyncpg LockNotAvailableError and pgcode 55P03 in _handle_dbapi_error
- Register FastAPI exception handler returning 409 with Retry-After header



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2026-02-24 10:52:07 -08:00

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