Evaluation Tags & Release Slicing

Attach up to 10 flat str tags (key 1–64, value 1–64) on evaluate:

{ "tags": { "release": "2026.10", "lane": "support" } }

Filter history with ?tag=release:2026.10. Postgres GIN @> powers multi-tag intersection. Insights uses tag slices for WoW deltas — see /insights.