@sam Just FYI, I now had a 146 unread posts blue bubble about this topic: Discourse Calendar without being able to understand how it’s possible according to your above explanations. The only thing I can think of is that the mark of till where you’ve read goes down when the actual post is deleted (I know you said it wasn’t the case. Then I don’t know. But I know that big deletions lead to big unread messages bue bubbles)