public static void EnsureValid(GuidDataRequest data, string parent = null)
 {
     if (!ValidationFunctions.MaxLengthNullable(data.User, 255, out var messageUser))
     {
         throw new ValidationException("user"._path(parent), messageUser);
     }
     if (!ValidationFunctions.ExpireNullable(data.Expire, out var expire, out var messageExpire))
     {
         throw new ValidationException("expire"._path(parent), messageExpire);
     }
 }