08d5bf9b06
The salvaged _sync_session_model_from_agent reached into self._session_db._execute_write with a duplicate inline read-modify-write and a comment claiming SessionDB had no metadata updater — but update_session_meta already exists for exactly this. It also called the AsyncSessionDB forwarder synchronously (via _execute_write), which returns an un-awaited coroutine, so the write silently never ran. Route through the synchronous SessionDB (self._session_db._db) — the same pattern the surrounding run_sync closure already uses (it runs off the event loop in the executor) — and use the existing update_session_meta / get_session helpers instead of raw SQL.