Downloaded database import update existing values without any filter

[AtiqGauri]

Issue

We generate and store pattern which are processed locally and downloaded from cloud. There is this problem that downloaded database can overwrite popularity of locally generated pattern's popularity. This can cause problem if locally generated pattern popularity is latest and accurate compare to cloud supplied data.

This happens because we are using dexie-import-export package to import large size database without using a lot of memory. Right now there is no way to make a filter to solve this problem. Reported issue: https://github.com/dfahlander/Dexie.js/issues/1008

Expected Behavior

Database popularity should only be updated if newly supplied value is latest(bigger) compare to stored popularity of any pattern.