Thanks. I clicked on 'past' immediately after posting, but all I saw were Algolia search results for the keywords in the title. If I'd seen it had been posted before, I probably would have deleted my post. ISTR 'past' used to show matches for the URL, and not the title. Perhaps I'm mistaken.

I wouldn't treat these as warnings about posting (you're allowed to repost after some time). These are more about sharing relevant older conversations for the interested.