public void RemoveListId(string id) => ListIdsList.Replace(id, "").Trim(',');
public bool ListIdExists(string id) => ListIdsList?.Contains(id) ?? false;
public void AddListId(string id) => ListIdsList += ListIdsList.IsEmpty() ? id : $",{id}";
public Group() { PartitionKey = EntityPartitionKey; groupUsers = UsersJson.SerializeJsonListOrDefault <GroupUser>(); listIds = ListIdsList.SplitOrDefault(); }