Tag

System Design

1 post

October 2026

23 Oct 2026 The Primary Key That Knew What Time It Was: UUIDv7, RFC 9562, and Choosing Identifiers That Age Well RFC 9562 replaced the 2005 UUID specification in May 2024 and added UUIDv7: a 48-bit Unix millisecond timestamp followed by random bits, so identifiers sort by creation … Research 28 min read