SQLAlchemy - Postgresql -查询自动映射表时将datetime转换为unix时间戳

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

engine = create_engine('postgresql://username:password@localhost/database_name')
Session = sessionmaker(bind=engine)
session = Session()

Base = declarative_base()

class MyTable(Base):
    __tablename__ = 'my_table'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    created_at = Column(DateTime, default=datetime.utcnow)

result = session.query(MyTable).all()

for row in result:
    unix_timestamp = int(row.created_at.timestamp())
    print(unix_timestamp)