Append data to db without overwriting about firebaseapp

[JeanRemiDelteil]

@jrob256 FirebaseApp is a wrapper around the REST api provided by Firebase.
We can not change the way their api is working.

I would say that in this case, you can achieve your goal by checking first if data exists or not, or establishing rules that prevent updating existing data (and using normal access, not admin access).

You have to think well about your usage of the Firebase REST API, all the documentation can be found here:
https://firebase.google.com/docs/reference/rest/database/