Notifications

[nichtich]

This is a rough idea of a feature: implement a websocket endpoint to send notifications to users:

• if a mapping created by the user has been annotated
• if a mapping created by the user has been edited (if editing other user's mappings is possible)
• if an annotation by the user has been responded to (requires other non-existing features)
• allow to send messages between users (this would make it yet another chat application)?

likely requires #40.

In a far later release all kind of changes could be send via websockets allowing collaborative real-time editing

[stefandesu]

I think this is fairly easy to implement if we restrict it to real-time websockets. We would only need to "hook" into the respective methods that cause the relevant events and (asynchronously, so that requests itself don't slow down) notify clients via the websocket. After opening a websocket connection, a client could configure what exactly they would like to receive.

[nichtich]

Closing in lack of a relevant use case.