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Re:Our Journey to PostgreSQL 12 by curryst on Tuesday January 26, 2021 @10:20AM (#25916728)
If messages between users go into their main database, then that would be a pretty reasonable amount.
Re:Our Journey to PostgreSQL 12 by stickfigure on Tuesday January 26, 2021 @11:03AM (#25917342)
600k is a sizable book. The Adventures of Huckleberry Finn is 600k. And that's the average per-user; most users will never send or receive messages.

The only thing I can imagine is that they do an incredible amount of activity tracking.