在Flask中使用for循环更新数据库？

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = '数据库连接字符串'
db = SQLAlchemy(app)

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50))
    age = db.Column(db.Integer)

db.create_all()

@app.route('/update_users')
def update_users():
    users = User.query.all()
    for user in users:
        user.age += 1
    db.session.commit()
    return '用户年龄更新成功！'

if __name__ == '__main__':
    app.run()