Disclaimer: not a dba so my terms might not be appropriate

I’ve seen uuid4 which replaces the first 4 bytes with a timestamp. It was mentioned to me that this strategy allows postgres to write at the end of the index instead of arbitrarily on disk. I also presume it means it has some decent sorting.

[inspiration](https://github.com/tvondra/sequential-uuids/blob/master/sequ...)