ULID: Universally Unique Lexicographically Sortable Identifier

I have always been a bit hesitant to use UUIDs with timestamps as it can be a security issue if the IDs are public. For example getting the age of a user account just from the id. I will say, however, that I have not heard of any major incidents stemming from this.

The classic solution to this is to have an internal ID (UUIDv7 if you want to use UUID, nice for indexing in newer databases) and an external ID (UUIDv4 or similar) which doesn't leak information to the outside world (but which otherwise doesn't offer any benefits at the storage level).

I don’t think it’s generally a good idea to store important domain information in synthetic keys. UUIDs should always be treated as opaque keys, but they may have structure that will help them fulfilling their primary function. Timestamp in UUID v7 may be close to moment of record creation, but it shouldn’t be the contract in your system that it is the creation timestamp.