Define support for a real-time database.

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A real-time DB store is essential for this as the "broadcast playout mix" will be governed by the "latest" broadcast JSON that is submitted by the clients either as the show is live or even saved before and scheduled for a time.

Consider solutions like Firestore in Firebase, but open the discussion to other databases that allow you to subscribe to events from Redis and other key/value storage solutions.

Ideally, it would be good if this was something that could be on a database instance in a Docker box so you can have multiple broadcast daemons.