maintenance/application/admin/command/Crud/stubs/mixins/modelinit.stub

    protected static function init()
    {
        self::afterInsert(function ($row) {
            if (!$row['{%order%}']) {
                $pk = $row->getPk();
                $row->getQuery()->where($pk, $row[$pk])->update(['{%order%}' => $row[$pk]]);
            }
        });
    }