On one hand, comments like "I added the info you asked for" should be deleted, as discussed here.
On the other hand, if they get deleted, the previous commenter who had asked for the info doesn't see the notification anymore. It's not good to give users only a limited timeframe to see in their inbox that the info they asked for got added.
A possible solution is to keep the notification that links to the answer, even if the comment gets deleted. Should this solution or another solution or no solution be implemented?