docs: def create_model_class(cls, name, table_name, attrs, validations=None, *, otherattrs=None,
                           other_bases=None):
      """Creates a new class derived from ModelBase."""
      members = dict(table_name=table_name, attrs=attrs, validations=validations or [])
      if otherattrs:
        members.update(otherattrs)
      return type(name, other_bases or (), members)