feat: optimize pool (#1363)

* feat: optimize pool

* feat: fix format

src/memos/api/server_api.py

@@ -39,6 +39,7 @@ def health_check():
         "version": app.version,
     }
 
+
 # Request validation failed
 app.exception_handler(RequestValidationError)(APIExceptionHandler.validation_error_handler)
 # Invalid business code parameters

src/memos/graph_dbs/polardb.py

@@ -165,7 +165,7 @@ def __init__(self, config: PolarDBGraphDBConfig):
 
         # Create connection pool
         self.connection_pool = psycopg2.pool.ThreadedConnectionPool(
-            minconn=2,
+            minconn=1,
             maxconn=maxconn,
             host=host,
             port=port,