code: def _delete_user(**filters):
      with create_session() as session:
          user = session.query(User).filter_by(**filters).first()
          if user is None:
              return
          user.roles = []
          session.delete(user)
  
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from airflow.auth.managers.base_auth_manager import BaseAuthManager
  from airflow.providers.fab.auth_manager.models import Role, User
  from airflow.security import permissions
  from airflow.utils import timezone
  from airflow.utils.session import create_session
  from airflow.www.security import EXISTING_ROLES
  from tests.test_utils.api_connexion_utils import create_role, create_user, delete_role, delete_user
label_desc: Use image node_id 1 for calling a global function with example usage: _delete_user() without return types