I wrote this post and linked to this (now non-existent) comment:
lemmy.sdf.org/post/52446618/26894334
The post that the comment falls under is still there, but the link to the comment is broken.
Querying the sitewide modlog on myself is not interesting. Just shows some unrelated nutty shit with a slrpnk.net mod. The thread looks like just a conversation with myself, effectively thinking out loud as I dig more. If the comment were by me and deleted by myself, there would be a trace left of it. Or even if it were someone else’s comment, a placeholder would be left.
My best theory is that SDF had some data loss or disaster, and they rebuilt the DB in a way that caused comments to get a new primary key. But wouldn’t the post have gotten a new number as well?
I think I linked to the comment that is now:
lemmy.sdf.org/post/52446618/24104545
but strangely, that id number is smaller than the comment that was written before it.