Database sharding

You can connect to multiple databases using databse url. https://firebase.google.com/docs/database/usage/sharding

GdxFIRDatabase.inst("https://your-db.firebaseio.com/")
    .onConnect()
    .after(GdxFIRAuth.inst().signInAnonymously())
    .then(new Consumer<ConnectionStatus>() {
        @Override
        public void accept(ConnectionStatus connectionStatus) {
            if (connectionStatus == ConnectionStatus.CONNECTED) {
                success();
            }
        }
    });