I've migrated an Android app from Google Analytics to Firebase Analytics. The Firebase Analytics console shows data from the time I migrated. But it does not show any of the historical data which is still in Google Analytics.
How can I import this historical Google Analytics data, so everything shows up in Firebase Analytics?
Reporting and the Data Models. Firebase uses an event-based data model, which results in reporting differences compared to those in Google Analytics. Unlike Google Analytics which has many screenview- and session-oriented reports, in Firebase all reports are user- or event-focused.
Views are not retroactive. Google Analytics will only track data for a particular view from the moment it is created; it will not include historical data from other views.
But on Android devices with Play Services, this one hour timer is across all apps using Firebase Analytics. In addition, Firebase Analytics will send down all of its data from the client if your user triggers a conversion event (like making an in-app purchase).
There is currently no API to import historical data into Firebase Analytics.
If you think this is a feature that many developers might need, you can request it here.
The best way to get data from Google Analytics to Firebase is by importing data to Big Query and then merging the data. Big Query lets you perform in depth queries on your data too.
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