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in a reddit post asking why db autoincrement starts at 1 and not 0, this comment stands out:

I’ve been in a handful of projects where people started at 1, ran out of space in positive numbers, and solved it by re-seeding their identity at -1, incrementing -1, or starting at the max negative number for their datatype and incrementing +1. Buys them time before they have to change the datatype, which is often a disruptive operation.

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