code: function (err) {
  		if (err) {
  			LOG.warn(err.toString());
  			event.done('SR_UPDATE_USERDATA', {code: 1, msg: 'user data update failed'});
  		}
  		else {
  			event.done('SR_UPDATE_USERDATA', {code: 0, msg: 'user data updated'});
  		}
  	}
docs: store back