(Optionally) auto-delete crossed of items after N days

The main use-case would be to better coordinate within the family for which items have recently been bought, and without having to worry about older history.

One simple implementation for this would be to allow to auto-delete all crossed-off items after N days. Since some people might use crossed of items in different ways, it would probably need to be configurable, and since different lists can have different deadlines it would probably need to be configurable per list.

Other solutions that help solve the same use-case could be considered instead. However, for me at least, the simple solution would suffice.