Funny thing is I was in secondary school in the 80s and had 3 Teachers (Technical Drawing, Art and PE) who had also taught my Dad, so he had stories, for the same teachers, that blew mine out of the water.

The worst thing I ever saw were two 15 year old boys being dragged by their collars across gravel by my geography teacher when getting off the coach from a school trip aboard. They had trashed their hotel room, tearing the paper off the walls, burning their bedsheets and throwing food and drink all over the room. This would have been bad enough but the trip was to the CCCP (as was) and the hotel had contacted the local governor who had contacted the embassy in the UK who had talked to the Foreign Office, putting the whole educational trip program in jeopardy. By the time the bollocking had made it to the school (before we arrived back at the school the teachers and students had no idea, there were no mobile phones back then) it was apocalyptic, so my Geography teacher just totally lost his shit, mixture of fear and rage I think.

My Dad’s stories involved Teachers dangling kids out of the windows by their ankles and having their head shoved in a desk and the desk lid slammed down. Proper “how was nobody killed” kind of stuff.

I would hope this would be obvious to anyone. If your client can highlight which posts you have upvoted in the web and app UI then the fact that your user specifically upvoted that post must be recoverable from the instance server and thus must be recoverable by the instance admins. I would not expect anything different.