text: from sourcehub import make_app
  from flask_migrate import Migrate
  
  
  if __name__ == '__main__':
      app = make_app()
      app.run(
          host='0.0.0.0',
          debug=True,
      )
  
  # TODO
  # manage command:
  # clean database: 清除数据库冗余
  #     清楚 tags 表中 count 为0 的表
  