We're using the "Citation Needed" notices a lot since they were introduced, but there is no really efficient workflow for removing them later. We rely pretty much on the community to flag posts that either addressed the issue and should have the notice removed, or that didn't address the issue and should be deleted.
There is a list of annotated post, but that is far from perfect as it doesn't distinguish between different kind of notices and it can't filter out according to date. We need to give the user a reasonable amount of time to address the issue before deleting.
I propose to add a new queue for older posts with a "Citation Needed" banner. Older would be something like 14 days. The possible actions in the queue would be
- Edit (to add citations)
- Remove banner (citations were added already)
- Delete post
This would also mean that notice removal (and maybe also banner addition) should be put into the hands of the community, maybe something like three users need to agree to put up or remove a notice.