This is pretty impressive. Being able to decouple the user-facing realtime transport layer from the database engine is one of the main things which has been holding big companies back from adopting Firebase (due to Firebase&#x27;s tight coupling with MongoDB and the associated lock-in factor).<p>I imagine that eventually you would be able to hook fusion into any database engine or service you like - If you don&#x27;t want to put your sensitive data on a public cloud, you could just use fusion as-a-service but host the Database part yourself.