Really, I think the user in that case needs to be much more choosy about what they put in the database. It will save them time and greatly improve the signal-to-noise ration.
Going through all your notes regularly and asking “should I delete this? Does it bring me joy?”
I'd just delete things opportunistically, as you come across them. If you aren't coming across them, there's no value in deleting them.
Going through all your notes regularly and asking “should I delete this? Does it bring me joy?”