Source code is available on GitHub. Below I describe changes and functionality in the latest commit.
To test online replay, go offline and execute some actions in the sample app - change few records and try to search by first name, also try to use page navigation buttons. You will be able to save changes in offline mode, but if this is your first time loading app and data from other pages wasn't fetch yet, then page navigation would not bring any new results in offline mode (make sure to load more records while online and then go offline): Read the complete article here
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