如何在SQLAlchemy时间戳列中插入值

from datetime import datetime
from sqlalchemy import create_engine, Column, Integer, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# 创建数据库连接
engine = create_engine('数据库连接字符串')
Base = declarative_base()
Session = sessionmaker(bind=engine)
session = Session()

# 定义模型类
class MyModel(Base):
    __tablename__ = 'my_table'
    id = Column(Integer, primary_key=True)
    timestamp = Column(DateTime)

# 创建表
Base.metadata.create_all(engine)

# 插入值
timestamp_value = datetime.now()
new_record = MyModel(timestamp=timestamp_value)
session.add(new_record)
session.commit()