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Mobile System Design - Coggle Diagram

- - - - Snapshot
        A client pushes a snapshot of new data to the backend.
        It's appropriate for simple scenarios where an app sends only new data without later editing/removing. For example, AnalyticsLibrary can use a described solution.
        Backend merging may become very tricky for more complicated scenarios where an item can be edited or contain links to other such items.
      - Delta Table
        A client creates a new Delta Table (besides Data Table where we store data as is) where stores "deltas" of changes.
        Example: user id=1 edited a node with id=100 where updated field "text" from "la-la" to "ha-ha".
        When a user is offline the App can apply local deltas on the Data Table. But, after syncing with the Backend, some rows in the Data Table can be overwritten by a Server.
        Preferably upload deltas while syncing before any requests to Backend to keep consistency.