I half remember a tale about Twitter falling over because they ran out of primary keys on their notifications back in the day...

Is that accurate? I can't find anything about it online with a hasty search.

Does anyone have a link to a write up / post mortem or know where I might have heard that tale ages ago?

Can anyone confirm it?

(I know it's technically possible if you use ints as your primary key - just wondering if it was true about Twitter in particular)

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