> Extremely large systems do not run into the limitations of bigint because at that scale the identifiers are naturally segmented, often implicitly. Agreed. Th

> Extremely large systems do not run into the limitations of bigint because at that scale the identifiers are naturally segmented, often implicitly. Agreed. That's the real key imo. You could have a 2^64 random number as a primary key if that key is also namespaced per customer - maybe in aggregate your customers generate > 2^32 events but a given customer may not. And there's other ways to limit it further. This is the approach we take, basically, although we use a counter and not a random number.