simplify engine for direct connection

src/app/database/db.py

@@ -13,12 +13,8 @@ else:
     elif DATABASE_URL.startswith("postgresql://") and "+asyncpg" not in DATABASE_URL:
         DATABASE_URL = DATABASE_URL.replace("postgresql://", "postgresql+asyncpg://", 1)
 
-engine = create_async_engine(
-    DATABASE_URL,
-    connect_args={"prepared_statement_cache_size": 0},
-    poolclass=NullPool,
-    isolation_level="AUTOCOMMIT",
-)
+engine = create_async_engine(DATABASE_URL)
+
 
 async_session_maker = async_sessionmaker(engine, class_=AsyncSession)