public static string History(SiteSettings ss, int groupId)
        {
            var groupModel = new GroupModel(ss, groupId);

            ss.SetColumnAccessControls(groupModel.Mine());
            groupModel.Get(
                ss,
                where : Rds.GroupsWhere()
                .GroupId(groupModel.GroupId)
                .Ver(Forms.Int("Ver")),
                tableType: Sqls.TableTypes.NormalAndHistory);
            groupModel.VerType = Forms.Bool("Latest")
                ? Versions.VerTypes.Latest
                : Versions.VerTypes.History;
            return(EditorResponse(ss, groupModel).ToJson());
        }