The delete replacement function.

        :param builder: The query builder
        :type builder: orator.orm.builder.Builder

def _on_delete(self, builder):
        """
        The delete replacement function.

        :param builder: The query builder
        :type builder: orator.orm.builder.Builder
        """
        column = self._get_deleted_at_column(builder)

        return builder.update({column: builder.get_model().fresh_timestamp()})