thanks for your quick reply. It's really helpful for me to know that it is like that. And I completely understand why it was implemented. It seems I must have read some info wrong or it must have been old.
But that's actually quite a major issue for us and they way we're using NodeBB. It would be great if notification deletion could be made configurable. How are the chances of that beeing implemented? I don't know how much of an issue that is for other users of NodeBB.
Though I still need a short term solution for that. I need a way for a user to find all of his mentions when he hasn't been looged on for more than 7 days (but usually not more than a couple of weeks). Utilizing search won't really work, because it's not just about personal mentions, but also all of the groups the user is in. So that way would be rather inconvenient. The only possibility for me right now seems to be using email notifications. But maybe you've got another idea.
Thanks again for your help,