# ADR 0005 — UUIDv7 + slug entity identity

Status: accepted (2026-07-07) · Plan: rev 3, R3-5 (resolves audit D1)

## Context
Rev 2 used TEXT primary keys ('host:hubris') — renames break FKs, and
date-string signal IDs are race-prone.

## Decision
Primary keys are UUIDv7 (time-ordered, generated in Go). Every entity also
carries a unique human slug ('host:hubris'); (type, name) is unique too.
The API accepts UUID or slug everywhere; slugs may change (rename), UUIDs
never do.

## Consequences
- Renames are metadata updates; history and edges survive.
- UUIDv7's time-ordering keeps B-tree inserts append-mostly.
- Seeds and exports use slugs (human-diffable); ingest resolves to UUIDs.