test fix: mysql timeout correction

mysqlchatstore.py

@@ -42,7 +42,7 @@ class MySQLChatStore(BaseChatStore):
         """
         Cria e retorna um sessionmaker síncrono e um sessionmaker assíncrono.
         """
-        engine = create_engine(connection_string, echo=False)
+        engine = create_engine(connection_string, echo=False, pool_pre_ping=True, pool_recycle=3600)
         session = sessionmaker(bind=engine)
 
         async_engine = create_async_engine(async_connection_string)