Backend: Remove Song from Queue

[rldaulton]

Create a backend function that monitors and deletes songs that drop below a determined vote threshold.

General Architecture Idea:
onWrite() to voteCount in the queue, trigger a function that checks if

• the voteCount is < -10 (?)
• AND if voteCount < ( usersCheckedIn.count * 0.25) ?

Perhaps delete a song if it falls past a negative vote balance based on a ratio of checked in users?

[rldaulton]

For the sake of time, if the vote count is more than 10 negative votes, the song will be removed from the queue.

This is in the removeSongFromQueue function.

The issue is that in order to perform deletion based on a ratio of checked in users, we need to know how many users are checked in to the venue. We can't currently count this without querying and grabbing all the nodes in the check_ins tree.