fix: DBのコネクションプーリングをしないように修正

ecs/jskult-webapp/src/db/database.py

@@ -1,4 +1,4 @@
-from sqlalchemy import (Connection, CursorResult, Engine, QueuePool,
+from sqlalchemy import (Connection, CursorResult, Engine, NullPool,
                         create_engine, event, exc, text)
 from sqlalchemy.engine.url import URL
 from sqlalchemy.pool import Pool
@@ -63,8 +63,7 @@ class Database:
 
         self.__engine = create_engine(
             self.__connection_string,
-            pool_timeout=5,
-            poolclass=QueuePool
+            poolclass=NullPool
         )
 
     @classmethod
@@ -181,7 +180,7 @@ class Database:
             self.__connection = None
 
     def to_jst(self):
-        self.execute('SET time_zone = "+9:00"')    
+        self.execute('SET time_zone = "+9:00"')
 
     def __execute_with_transaction(self, query: str, parameters: dict):
         # トランザクションを開始してクエリを実行する