[zzo38computer]

I had seen GitHub node IDs, although I had not used them or tried to decode them (although I could see they seem to be base64), since I only used the REST API, which reports node IDs but does not use them as input.

It looks like a good explanation of the node IDs, though. However, like another comment says, you should not rely on the format of node IDs.

[catlifeonmars]

GitHub should have encrypted their node ids. Now they risk breaking a ton of users if they decide they want to change anything about the id generation (for example to scale the db horizontally by removing sequential ids).

Several companies I’ve worked for have had policies outright blocking the use of nonrandom identifiers in production code.

[misiek08]

Just out of curiosity, because I saw way too many i++ implementations - were things like UUIDv7 allowed or because of timestamp they are not random enough? While having such conversations I assume it’s already good enough, but maybe I’ll learn something here!

[catlifeonmars]

UUIDv7 wasn’t as ubiquitous at the time so it did not come up.

Here’s how I would think about it: do I want users to depend on the ordering of UUIDv7? Now I’m tied to that implementation and probably have to start worrying about clock skew.

If it’s not a feature you want to support, don’t expose it. Otherwise you’re on the hook for it. If you do explicitly want to provide time ordering as a feature, then UUIDv7 is a great choice and preferable to rolling your own format.