add user event tracking (sqlite<->mysql) and authentication (firebase?) to existing Cordova Android & iOS app

I have an existing Cordova app for Android and iOS that I need adding the following functionality: • USER AUTHENTICATION (perhaps firebase as it allows many ways of signing in) • CUSTOM EVENT ANALYTICS (you must use MySQL for the server side as I already have a server with it installed, and probably use SQLite for the client) ***IMPORTANT*** I am using the app for academic research, so the event analytics system must be thoroughly debugged. It needs to function offline at all times, writing events to local SQLite db, then updating the MySQL db on the server when a connection is found. The kinds of events I need tracked are e.g. when the user stops or starts an audio file or when a custom event is fired. I also need you to account for the differences in Android and iOS activity cycles, i.e. the differences between 'pause', 'stop' and 'resign' methods in the Cordova API. I do not need a web-interface for the analytics, simply the ability to export the server db as a text file (e.g. csv). I will supply: • existing app code. • list of events to be tracked. • MySQL server credentials. I will be much more interested in bids that demonstrate you have fully read and understand all requirements in my description. Thanks