code: async def clear(self, using_db=None) -> None:
          
          db = using_db if using_db else self.model._meta.db
          through_table = Table(self.field.through)
          query = (
              db.query_class.from_(through_table)
              .where(getattr(through_table, self.field.backward_key) == self.instance.id)
              .delete()
          )
          await db.execute_query(str(query))
docs: Clears ALL relations.