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Re:Even years later, Twitter doesn’t delete direct messages by spudlyo on Friday February 15, 2019 @08:28PM (#19176389)
Your instincts are correct. I happen to know that DMs at Twitter are (and most likely still) stored in a sharded MySQL store[0]. Deleted DMs and tweets are "tombstoned", and not actually deleted via a DELETE, which has pretty terrible performance characteristics in MySQL

[0]: http://highscalability.com/blog/2011/12/19/how-twitter-store...

Re:Even years later, Twitter doesn’t delete direct messages by Operyl on Friday February 15, 2019 @09:04PM (#19176532)
I wonder what they use to generate IDs! /s

Man that comment popped up a bunch in that blog post, lol.