using firebase with another database when firebase is down

I'm currently using both mysql and firebase on my nodejs web server. In one of my functions, I am : inserting into my mysql database

db.any('INSERT INTO requests(id, firuid) values ($1, $2)', [userid, uid])

then I am updating firebase

.then(function () {
                ref.child(uid).update({
                    "connecting": false
                })

In order for the app to work both of these need to happen.

If firebase goes Down!! then a lot of data is going to be inconsistent since mysql inserts happen first. How would someone handle a situation like that?

via slimboy