public bool Restore(int appId, int changeId, [FromBody] ItemIdentifier item)
 {
     new AppManager(appId, Log).Entities.VersionRestore(EntityBackend.ResolveItemIdOfGroup(appId, item, Log).EntityId, changeId);
     return(true);
 }
 public List <ItemHistory> History(int appId, [FromBody] ItemIdentifier item)
 => new AppManager(appId, Log).Entities.VersionHistory(EntityBackend.ResolveItemIdOfGroup(appId, item, Log).EntityId);