Mark opinions that have not logged in for more than X days

[Iwan-Ittermann]

Is your feature request related to a problem? Please describe.
1:1 dialogues are at the heart of DPT. Yet it can be frustrating, if propositions are made to accounts that are not active any more. Users can't tell if they are ignored or if the account is dead.

Describe the solution you'd like
Opinions that belong to accounts that have not logged in for more than X days, could have a little icon next to them. This would preserve historical opinions, while preventing frustration.

Describe alternatives you've considered
They could also fade away. this would provide some kind of "self cleaning" mechanism for topics.

Additional context
We need to be careful not to create a "graveyard" feeling. The majority of accounts get abandoned one day!