feat(health): /healthz reports last applied migration (P4-I)#82
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Architect audit P4-I. `GET /healthz` body gains a `migration` field carrying the lex-highest entry from `SequelizeMeta` (e.g. `"20260519000000-idempotency-keys"`). Sequelize-cli timestamp-prefixes migration filenames so lex order matches apply order — pulling the top row is equivalent to "last applied" without a separate marker. Use cases: - Rolling-deploy verification: poll /healthz across pods, confirm every instance is at the expected migration before flipping traffic. - Drift detection: a stuck pod that didn't pick up a migration shows up as a different `migration` value in the response. - Compliance/audit: timestamps the schema version visible at probe time. Implementation notes: - The migration query is wrapped in its own try/catch. A failure to read SequelizeMeta (missing table on a fresh DB, perms, etc.) does NOT flip `status` to `degraded` — the DB itself is up, so the API is functional. `migration` just falls back to `null`. - No new query when the DB ping fails — `migration` stays null and the outer 503 covers the case. - OpenAPI spec updated to document the new field. Tests: - New healthz case asserts `migration` is present and is either `null` or a string. Specific values are covered by integration tests against a real DB. - Full suite: 358 pass / 4 skip. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Part of architect audit issue #73 — iteration P4-I.
Summary
GET /healthzbody gainsmigration— last applied migration name fromSequelizeMeta. Lets a rolling-deploy caller verify every pod is at the expected schema version.migration: null.Test plan
migrationkey present + null|string.This code proudly made in Nebraska. GO BIG RED! 🌽 https://xkcd.com/2347/