So we were making android application for our college festival.. we decided to use Firebase as our primary service for "everything". Decided to use Firestore as database as it wouldn't require much web API call, and mainly as it had a free plan.

We thought that we would never hit the limits of free plan... Needless to say, we started hitting the daily limits about a week before the fest. And it became more of an issue a few days before the fest when we started to hit the limits within 4 hours of the day!!!

But we were lucky enough that the app sustained on the day of festival, lucky enough!!