Thanks for your reply.
So does the "replies" include the original post or simply subsequence reply post?
Anyway, when I changed the "at most replies" to be 1, I deleted some thread, however still I have a lot of thread without any post. I regenerate the counters a few times, I could not delete all threads without single post.
A separate question:
I also delete all users without any posts, if I can delete any thread without any user, it can also help me.
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