UUIDs are everywhere now.

Databases, APIs, distributed systems, event streams, authentication systems, microservices — almost every modern application eventually needs globally unique identifiers.

For years, UUID v4 became the default choice because it was simple and highly collision-resistant.

But recently, UUID v7 started gaining attention because it solves one of the biggest weaknesses of v4:

poor database locality.

The interesting part is that UUID v7 is not simply “better.”

It depends heavily on your workload, database architecture and scaling needs.

Quick Overview

Version Generation Method Ordered?…