fix: fix expire on commit session

src/db.py

@@ -16,7 +16,7 @@ engine = create_engine(
     connect_args={"check_same_thread": False},
     pool_pre_ping=True,
 )
-SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False)
+SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False, expire_on_commit=False)
 Base = declarative_base()
 
 class User(Base):