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HealthLog/docs/ops
Marc-André Bombeck 8995bef61c feat(ops): synthetic post-deploy journey
Post-publish verify proves the published image boots. Nothing proved that
on a running instance a person can sign in, write a reading and read it
back — which is exactly the shape of the defects this line keeps
rediscovering: a value written and never read.

`scripts/synthetic-journey.mjs` walks that journey in plain Node 22 with no
dependencies, so it runs from a workstation, a runner or the deploy host.
It warms `/`, `/api/health`, `/api/version` and the measurements list first
and discards those timings (the first hit on each route after a deploy is a
cold start), then asserts five legs in order: the served version equals the
expected one, the password flow signs in through a cookie jar, a weight
reading is written with an Idempotency-Key, the same row reads back with
its value, unit and source, and the reversible delete leaves the account
clean. One line per leg with the elapsed time; the first failure ends the
run non-zero with the status and a body excerpt that has every token shape
redacted out of it.

The workflow is `workflow_dispatch` only, with `base_url` and
`expected_version` as inputs and the credentials read from repository
secrets. It is deliberately not wired into the deploy path: the target
instance and the secrets are the maintainer's call.

Mutation proof, against a production build served from
`.next/standalone/server.js` on a throwaway Postgres.

Green:

    warm      35 ms  (discarded)
    ok        version         2 ms  serves 1.38.13
    ok        sign in        78 ms  session cookie held
    ok        write          64 ms  wrote cmtup9lwu0007zhovn0mxajdz
    ok        read back       8 ms  77.7 kg (MANUAL)
    ok        delete         27 ms  account left clean

    synthetic journey green

Read leg broken deliberately — the same server behind a throwaway forwarder
that empties the `GET /api/measurements` list and changes nothing else:

    ok        version         4 ms  serves 1.38.13
    ok        sign in        38 ms  session cookie held
    ok        write          40 ms  wrote cmtupa4ck000gzhovwnij64fz
    FAILED    read back       8 ms  read back: the list came back without the reading
              status 200
              body   {"data":{"measurements":[],"meta":{"total":0}},"error":null}

    synthetic journey RED on "read back"

Version leg broken the same way, by asking the instance for the previous
tag:

    FAILED    version         3 ms  version: instance serves "1.38.13", expected "v1.38.12"

    synthetic journey RED on "version"

`--self-test` carries that proof in the repository: it runs the journey
against an in-process instance nine times, once with nothing broken and
once per broken leg, and fails if a broken leg still comes back green. The
workflow runs it before it touches the real instance.

Gates: typecheck, `node --check`, lint (the three known warnings, no
errors), prettier, the workflow and CI-determinism guards.
2026-09-10 01:04:30 +02:00
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