Used in https://github.com/mhenc/airflow/blob/master/airflow/dag_processing/manager.py#L613

should be straighforward
#
#
#
from __future__ import annotations
from enum import Enum
from sqlalchemy import Column, ForeignKeyConstraint, String, Text, false
from sqlalchemy.orm import Session
from airflow.models.base import Base, StringID
from airflow.utils import timezone
from airflow.utils.retries import retry_db_transaction
from airflow.utils.session import NEW_SESSION, provide_session
from airflow.utils.sqlalchemy import UtcDateTime
class DagWarning(Base):