code: func DeleteMulticastGroup(db sqlx.Execer, id uuid.UUID) error {
  	res, err := db.Exec(`
  		delete from
  			multicast_group
  		where
  			id = $1`,
  		id,
  	)
  	if err != nil {
  		return handlePSQLError(err, "delete error")
  	}
  
  	ra, err := res.RowsAffected()
  	if err != nil {
  		return handlePSQLError(err, "get rows affected error")
  	}
  	if ra == 0 {
  		return ErrDoesNotExist
  	}
  
  	log.WithFields(log.Fields{
  		"id": id,
  	}).Info("multicast-group deleted")
  
  	return nil
  }
docs: // DeleteMulticastGroup deletes the multicast-group matching the given ID.