docs: def init_core(app):
      """Init core objects."""
      from rio import models # noqa
      db.init_app(app)
      celery.init_app(app)
      redis.init_app(app)
      cache.init_app(app)
      sentry.init_app(app)
      graph.init_app(app)
      setup_migrate(app)
      setup_user_manager(app)