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George WealeandCopybara-Service
f50847460f
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