How do you unlist a topic in the ruby console?
You do so through the rails console that comes with discourse.
Get a rails console open (in a normal install run this as root on your server)
cd /var/discourse ./launcher enter app rails c
Execute below query where 11 is the topic ID visible in the URL bar (this topic’s ID is 107060)
Topic.where(id: "11").find_each do |topic| topic.update_status("visible", false, Discourse.system_user) end
The system user will unlist the topic.