Hey, I thought we had something in our Code of Conduct about not deleteing messages. It turned out I remembered wrongly.
I checked after a new member deleted several posts of theirs, even after one had been answered to. Seeing it's not put down anywhere that, traditionally, we used to frown upon it, he/she couldn't know any better.

So, there's no ill will in mentioning it here, in case you stumble upon it, ttl, but it was a good example why we used to tell people off for doing it: It makes the people who answered to a vanished post look strange, it diggs up threads without adding anything in the end, and it has actually actively been used to make people look more aggressive or stupid by changing the actual context of a discussion.

Should it be put into the Code of Conduct?

Something like, "Please delete posts only when asked to do so by a moderator. If you double posted, edit the second post and put a short explanation in the box below the post that says "Reason for editing" (just "double post" would be enough). Edit the content of your posts only within a certain time frime after posting, and try to refrain from it if somebody already answered to your post."

Maybe a short reason, too, but right now, I can't come up with a sentence
that sounds gramatically right to me. What do you think?