Not avaiable out of the box, but you can use something like https://github.com/julianlam/nodebb-plugin-archiver or modify it to delete the topics instead of locking.
Unsolved Is "usage" tag in "/admin/manage/uploads" deleted? Or how to make it work?
There are some files in the
\assets\uploads\folder whose topic and replies have been delete.
I have to delete them to realize space for other files. But I don't want to delete some under-using assets.
So is there some other ways to manage assets of my nodebb?
There is a filter for unlinked assets that nothing is using. If it is not under there, it is in use somewhere.