Comment 1 for bug 1421802

We do have a (limited) support for automatic updating via "TTL" mechanism in the shell plugin; scopes opt in for it by declaring ttl value (small = 30 seconds, medium = 5 minutes, large = 1 hour) in their config file.

We could use it here, only bit missing is to support it for remote scopes - make them declare it in the json here https://dash.ubuntu.com/smartscopes/v2/remote-scopes and make smart scopes client code parse it and expose in scope metadata (so that shell can use it).