Is it possible to automatically aggregate data in Firebase

Question

I have a collection where every element has its own counter (a numeric value). Is it possible for Firebase to automatically aggregate (reduce) this data into a single value?

Answer 1

Server-side (ie. "firebase-side") the answer is no.
if your app is simpler/not-secured, you'd do that client side.. but I guess it's not the case.
Assuming your app's data is fragmented and secured, you'd normally do this calculation on your server (which is itself, a firebase-client), and push this piece of data back to firebase.