docs: def set_flag(self, user, note=None, status=None):
          """Flags the object.
  
          :param User user:
          :param str note: User-defined note for this flag.
          :param int status: Optional status integer (the meaning is defined by a developer).
          :return:
          """
          if not user.id:
              return None
  
          init_kwargs = {
              'user': user,
              'linked_object': self,
          }
          if note is not None:
              init_kwargs['note'] = note
          if status is not None:
              init_kwargs['status'] = status
  
          flag = get_flag_model()(**init_kwargs)
          try:
              flag.save()
          except IntegrityError:  # Record already exists.
              pass
          return flag