diff --git a/my-deepagent/src/my_deepagent/persistence/db.py b/my-deepagent/src/my_deepagent/persistence/db.py
index ce1a555..a5d0ca2 100644
--- a/my-deepagent/src/my_deepagent/persistence/db.py
+++ b/my-deepagent/src/my_deepagent/persistence/db.py
@@ -75,10 +75,17 @@ class Database:
     """
 
     def __init__(self, database_url: str) -> None:
+        # v0.3 hotfix: Postgres asyncpg pool occasionally hands out stale
+        # connections whose underlying socket was closed by the server (idle
+        # timeout, container restart, network blip, …).  `pool_pre_ping`
+        # adds a fast ping before each checkout and invalidates dead
+        # connections so the next acquire dials a fresh one — fixes the
+        # "InterfaceError: connection is closed" 500 seen under SSE load.
         self._engine: AsyncEngine = create_async_engine(
             database_url,
             poolclass=None,
             echo=False,
+            pool_pre_ping=True,
         )
         _attach_dialect_pragmas(self._engine)
         self._session_factory: async_sessionmaker[AsyncSession] = async_sessionmaker(