code: def dagbag():
      from airflow.models.dagbag import DagBag
  
      # Ensure the DAGs we are looking at from the DB are up-to-date
      non_serialized_dagbag = DagBag(
          read_dags_from_db=False, include_examples=True
      )
      non_serialized_dagbag.sync_to_db()
      return DagBag(read_dags_from_db=True)
  
imports: from __future__ import annotations
  import datetime
  from typing import Callable
  import pytest
  from sqlalchemy.orm import eagerload
  from airflow import models
  from airflow.api.common.mark_tasks import _create_dagruns, _DagRunInfo, set_dag_run_state_to_failed, set_dag_run_state_to_queued, set_dag_run_state_to_running, set_dag_run_state_to_success, set_state
  from airflow.models import DagRun
  from airflow.utils import timezone
  from airflow.utils.session import create_session, provide_session
  from airflow.utils.state import State
  from airflow.utils.types import DagRunType
  from tests.test_utils.db import clear_db_runs
  from tests.test_utils.mapping import expand_mapped_task
label_desc: Use image node_id 1 for calling a global function with example usage: dagbag() and returns: DagBag