Improve id to support microseconds

[eldoy]

Ok, but does it always work even if we're running a million requests in parallel on a multi-CPU system?

I did read that CUID wasn't the best for this, it's a k-sortable, which only has guarantees on less than 10 000 items, and the guy who wrote the lib recommended using created_at instead. When I tried with created_at it wasn't always working though, I guess the date isn't precise enough as it's only milliseconds.

https://github.com/paralleldrive/cuid?tab=readme-ov-file#monotonically-increasing-ids

Maybe it's overkill, but the fix should be easy enough. Using this as id stores time in microseconds:

var id = process.hrtime.bigint()