As a user, I want to be notified when new data is available

[Aboisier]

So that I don't have to refresh constantly.

I see two avenues:

1. When new data is available, show a toast with a "Refresh" button (pretty easy to implement)
2. Whenever there is new data, update the view (pretty intrusive)

This could be achieved using websockets; NestJS supports them natively (https://docs.nestjs.com/websockets/gateways).