George Weale f50847460f fix: Per-session locking and row-level locking in DatabaseSessionService.append_event ...

This change introduces an in-process `asyncio.Lock` per session to serialize `append_event` calls for the same session ID within a single process. For supported database dialects (MySQL, PostgreSQL, MariaDB), it also uses `SELECT ... FOR UPDATE` to acquire row-level locks on the session, app state, and user state records, preventing race conditions across different processes or database connections. A new test case verifies that concurrent updates to stale session objects correctly merge all state changes.

Close #1049

Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 867752676

2026-02-09 13:38:38 -08:00

..

integration

chore: Upgrade to headers to 2026

2026-01-20 14:50:09 -08:00

unittests

fix: Per-session locking and row-level locking in DatabaseSessionService.append_event

2026-02-09 13:38:38 -08:00

__init__.py

chore: Upgrade to headers to 2026

2026-01-20 14:50:09 -08:00