increase db connection pool

src/quickbot/db/__init__.py

@@ -8,7 +8,7 @@ from ..config import config
 # logger = logging.getLogger('sqlalchemy.engine')
 # logger.setLevel(logging.DEBUG)
 
-async_engine = create_async_engine(config.DATABASE_URI)
+async_engine = create_async_engine(config.DATABASE_URI, pool_size=20, max_overflow=60)
 async_session = sessionmaker[AsyncSession](
     async_engine, class_=AsyncSession, expire_on_commit=False
 )