message: some system might use none numbers (ex UUID) as user.id primary key
diff: @@ -392,7 +392,7 @@ router.post('/refetch-token', async (req, res, next) => {
  // validate username and password
  const schema = Joi.object().keys({
  - user_id: Joi.number().required(),
  + user_id: Joi.required(),
  refetch_token: Joi.string().required(),
  });
  