public ColumnInfo columnCreatedAt() {
        return _columnCreatedAt;
    }

    public ColumnInfo columnUpdatedAt() {
        return _columnUpdatedAt;
    }

    protected List<ColumnInfo> ccil() {
        List<ColumnInfo> ls = newArrayList();
        ls.add(columnCreatedAt());
        ls.add(columnUpdatedAt());
        return ls;
    }