Expiry dates

[Rob787]

Just to get the request on the new discussion platform as well, original was made here early this year:

#380

In my eyes this feature would make the tool very complete to handle all kinds of documents.

For (warranty 1-2 years) invoices, bills or any other documents which have a validity for a certain period, it would be nice to be able and set a "expiry date".

Maybe even a rule that these can be deleted automatically after an XXX period after expiry or receive an "expired/archive" tag, but at least a filter/notification to see all documents that are expired.