Fweeb – (“bless you, my son … I have done what you have done and then I gave up … but … bless you, my son” …) all things considered, I would adopt and then implement a rather simple blanket rule: “if the topic has been inactive more than 90 days, it becomes permanently locked.” … … Forever.
If any human being(!) seriously wants to revisit the topic, they know what to do … it’s called a hyperlink.
Whereas “bots,” trolling algorithmically as they do through “the URL-space” of a particular web site, will simply discover that most of the links don’t work anymore. (And, they will never know.)
'But also, fweeb … yes," I fully appreciate what you and your team do for us every day … having briefly done so myself (for a much, much smaller site) before throwing my hands up in disgust. And so, I thank you all … … @>-±– … “here’s a rose …” … for not throwing up your hands. “Yes, we see it. Yes, we thank you.”
“Yes, I’m/We’re just trying to help.”