code: def clean_db():
      clear_db_dags()
      clear_db_runs()
  
imports: from __future__ import annotations
  import datetime
  from unittest.mock import Mock, patch
  import pendulum
  import pytest
  from airflow import settings
  from airflow.decorators import task, task_group
  from airflow.exceptions import AirflowException
  from airflow.models.skipmixin import SkipMixin
  from airflow.models.taskinstance import TaskInstance
  from airflow.operators.empty import EmptyOperator
  from airflow.utils import timezone
  from airflow.utils.state import State
  from airflow.utils.types import DagRunType
  from tests.test_utils.db import clear_db_dags, clear_db_runs
label_desc: Use image node_id 1 for calling the TestSkipMixin obj's underlying member method code with example usage: obj.clean_db() without return types