Self-triggered perpetually running Firebase process using NodeJS

I have a set of records that I would like to update sequentially in perpetuity. Basically:

1. Get least recently updated record
2. Update record
3. Set date of record to now (aka. send it to the back of the list)
4. Back to step 1

Here is what I was thinking using Firebase:

// update record function
var updateRecord = function() {

    // get least recently updated record
    firebaseOOO.limit(1).once('value', function(snapshot) {
        key = _.keys(snapshot.val())[0];

        /*
         * do 1-5 seconds of non-Firebase processing here
         */

        snapshot.ref().child(key).transaction(

            // update record
            function(data) {
                return updatedData;
            },

            // update priority after commit (would like to do it in transaction)
            function(error, committed, snap2) {
                snap2.ref().setPriority(snap2.dateUpdated);
            }
        );
    });
};

// listen whenever priority changes (aka. new item needs processing)
firebaseOOO.on('child_moved', function(snapshot) {
    updateRecord();
});

// kick off the whole thing
updateRecord();

Is this a reasonable thing to do?