How to works mechanism of fetch deltas into app

Hey there
I am not sure what do you mean by 'deltas' ? 

Sorry Eugene Bychkov, the last weeks can't login and read your response, thanks for your leading and interesting. I referred whit term "Deltas" for mechanism WINS. I need your support whit sequence diagram if exists any.

Thanks a lot & regards

Hi!
We don't currently have a diagram to provide

But I can briefly explain how WINS works. Sugar Mobile periodically polls server for a changes that were made to records by using date_modified field as a filter criteria. Basically requests looks like "get Accounts with date_modified greater than {last_synchronizatio_date_modified}". If modified records exist they will be fetched from server and stored in local database. After that last sync time is saved and Sugar Mobile will repeat the same process after some time