retro: Session 2 — platform contract + /healthz + JSON logs

Session2.md

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+# Session 2 Notes — 2026-04-19
+
+## What We Set Out to Do
+
+Jeff opened the session with a platform-team intake form (#25) sitting
+in the repo from the homelab-IaC automation. The goal was to establish
+a real deploy contract for Quartermaster on home-ctr-onyx, then land
+whatever the contract committed the app side to building. Secondary
+goal: shake down the subagent-driven-development workflow on a
+non-trivial feature pair.
+
+## What Actually Happened
+
+One arc, two shipped issues (#26, #27) merged to main, three
+deploy-prep issues queued (#28, #29, #30), and one cleanup umbrella
+(#31).
+
+1. **Intake form filled out (#25).** Read the Archon platform contract
+   for shape, drafted answers from the repo's own state (stack, port,
+   data store, resource profile), and surfaced six real questions for
+   Jeff to decide: hostname, exposure, auth mechanism, launch window,
+   memory budget, structured-log ambition. After he answered, the
+   form landed as edit-in-place on the issue body. Key decisions:
+   `quartermaster.unbiasedgeek.com` (product surface, own cert),
+   public exposure, Traefik basic auth, ASAP, 1 GB memory, JSON logs
+   at launch.
+
+2. **Platform team responded (automated).** The homelab-IaC automation
+   drafted `PlatformContractQuartermaster.md`, provisioned DNS, two
+   Traefik middlewares (basic-auth, rate-limit), the bind mount with
+   nightly restic, and the basic-auth credentials — then closed the
+   issue with a "what you do next on your side" comment enumerating
+   Dockerfile / compose / Actions / Alembic-on-startup. The comment is
+   the authoritative next-steps document and got mapped to three
+   dependent issues after the main work landed.
+
+3. **Brainstorm → spec → plan for #26 + #27.** Ran the superpowers
+   brainstorming skill. Two meaningful design decisions: how broad
+   the seed-event instrumentation should be (picked "B: seed a
+   handful of events" — 5 events, cheap enough to be useful on day
+   one, narrow enough not to sprawl), and which JSON formatter
+   library to use (picked `python-json-logger`, rejected rolling a
+   stdlib-only `JsonFormatter` subclass). Spec landed at
+   `docs/superpowers/specs/2026-04-19-healthz-and-json-logs-design.md`;
+   plan at `docs/superpowers/plans/2026-04-19-healthz-and-json-logs.md`
+   (851 lines, eight bite-sized TDD tasks).
+
+4. **Subagent-driven execution.** Eight tasks dispatched sequentially
+   on `feat/platform-deploy-prep`, each with a fresh implementer
+   subagent, spec-compliance review, and code-quality review via the
+   `superpowers:code-reviewer` agent. Model selection: haiku for
+   mechanical tasks (dep bump, test-only adds, README edits, single
+   seed events), sonnet for integration tasks (log config + filter,
+   four coordinated seed events, /healthz endpoint wiring). Fix
+   commits triggered by review: #20bca13 (restore logger state in
+   dictConfig test) and #bfe9ed4 (assert healthz_failed log on 503).
+   Final state: 12 commits on the branch, 148/148 tests passing.
+
+5. **Merge to main.** User picked "merge locally" over PR. Main had
+   diverged because an unrelated MCP proposal doc (#23 → PR #24)
+   landed on origin while we worked. Option-chose rebase over merge
+   commits: rebased local spec+plan+feature onto `origin/main`, then
+   fast-forwarded. One snag: dirty `CLAUDE.md` (pre-session
+   modifications by Jeff) blocked the rebase silently under `set -e`;
+   stashed, rebased, popped. Linear history preserved.
+
+6. **Filed follow-up issues.** Three deploy-pipeline issues with
+   dependency chain (#28 Dockerfile → #29 compose → #30 Actions
+   workflow) plus #31 umbrella for the three non-blocking code-review
+   nits.
+
+## Key Decisions & Reasoning
+
+* **Intake answers favoured narrow over broad.** Memory budget of
+  1 GB (vs the platform's 4 GB default) because the app is genuinely
+  small. Structured JSON logs as launch work (not deferred) because
+  Promtail is already there, post-launch retrofits are annoying, and
+  the Loki-query story is only useful if the events exist from day
+  one. Rate-limit numbers proposed but deferred to the platform
+  team's tenant-default preferences. Bind mount specifically called
+  out to cover both the SQLite file AND the `backups/` directory, so
+  `scripts/backup-db.sh` keeps working unchanged in production.
+
+* **Single source of truth for log config (JSON, not dual files).**
+  Spec originally said "Python dict as source with a YAML shim for
+  uvicorn." Plan deviated to JSON-as-source loaded by Python at
+  import, consumed by uvicorn via `--log-config` pointing at the
+  same file. Reasoning: YAML requires `pyyaml` at runtime (uvicorn
+  doesn't bundle it), and a dual-file setup introduces drift risk.
+  The spec was edited mid-execution to reflect the simpler shape.
+
+* **`pythonjsonlogger.jsonlogger.JsonFormatter` kept despite
+  deprecation.** The plan used the deprecated module path; the Task 1
+  code reviewer flagged it. Kept the plan as-written through Task 2
+  (minimum change to ship), then fixed in a cleanup commit at the end
+  (`pythonjsonlogger.json.JsonFormatter`). This would have been the
+  wrong call in a busier branch; here it was fine because the branch
+  was short and the fix was cheap.
+
+* **Five seed events, not deeper instrumentation.** `month_created`,
+  `month_closed`, `template_entry_updated`, `posting_added`,
+  `posting_deleted` at the service-layer mutation sites. Placed after
+  `db.commit()` + `db.refresh()` so they only fire on durable success.
+  Payloads are minimal and deliberately exclude anything PII-ish
+  (no notes content, no names). An audit trail belongs in a table, not
+  in logs.
+
+* **`fmt` over `format` in the JSON config.** Plan specified `format`;
+  implementer hit `TypeError` on direct `factory(**cfg)` because
+  `JsonFormatter.__init__` inherits `fmt` from stdlib's `logging.Formatter`.
+  Implementer changed to `fmt`, documented in report. dictConfig with
+  `()` factory passes kwargs literally, so `fmt` works on both paths.
+  Plan was slightly wrong; fix was necessary.
+
+* **`/healthz` on its own router — but only as a file boundary.**
+  Spec language ("router separation protects from future middleware")
+  overstated what the separation buys. FastAPI's
+  `app.add_middleware(...)` is global and ignores routers. The
+  separation does help if future auth lands as router-scoped
+  `dependencies=[...]`. For Quartermaster this is moot: auth is
+  Traefik-side per the platform contract. Documented as a minor
+  cleanup note in #31 and in the spec's out-of-scope section.
+
+* **Rebase not merge on the divergence.** MCP proposal doc was
+  completely independent work; rebasing onto origin/main kept linear
+  history and read as one story. In a PR-workflow branch we'd have
+  used the merge button; for a direct local merge, rebase was the
+  right call.
+
+## Surprises & Discoveries
+
+* **The autouse-fixture workaround was wrong.** Task 5's test was
+  flaky because Task 3's `test_log_config_loads_via_dictconfig`
+  mutated the `quartermaster` logger's `propagate` flag globally.
+  Implementer's first fix added a file-scoped autouse fixture. Code
+  reviewer flagged it correctly: the problem is that the contaminating
+  test doesn't clean up after itself, and an autouse fixture only
+  protects tests in the same file — future tests elsewhere that use
+  caplog on `quartermaster.*` would be bitten silently. Right fix:
+  save/restore state in the contaminating test itself. This is a
+  generalisable pattern worth remembering — global-state-leaking
+  tests should always clean up, don't push cleanup onto every other
+  test.
+
+* **LogQL example had a field-that-doesn't-exist.** Third example in
+  the Logs section was `event="month_closed" | line_format "{{.path}}"`,
+  but `month_closed` records carry `year_month`, not `path` —
+  `{{.path}}` would render empty. Caught in the end-of-branch review,
+  fixed in cleanup commit. Small but exactly the kind of thing a fresh
+  set of eyes catches; easy to miss when writing docs while holding
+  the full model in your head.
+
+* **The subagent TDD discipline worked.** Every implementer subagent
+  actually wrote the failing test first, verified it fails, then
+  implemented. I briefed this in every prompt and they followed it.
+  The TDD failures were logged in each report ("assertion 0 == 1" /
+  "ModuleNotFoundError"). Didn't need to correct any subagent for
+  skipping that step. This is a win over direct execution, where I'd
+  sometimes rationalise past writing the failing test first.
+
+* **Task 4's smoke test hit `/` and got a 500.** Manual `docker run`
+  style smoke test in the subagent's CWD where the SQLite file or
+  schema wasn't set up. Didn't invalidate the task (the JSON access
+  log WAS captured and proved the format worked), but a reminder
+  that smoke tests need stable test environments. Worth checking
+  once deploy lands.
+
+* **Git `set -e` does not reliably abort on `git rebase` failure
+  inside a bash heredoc.** The first merge attempt ran three steps
+  under `set -e`; the rebase failures due to dirty `CLAUDE.md`
+  exited non-zero but the subsequent `git log` + `git merge` ran
+  anyway, landing the branch in "accidentally Option-3 state." Had
+  to untangle with a stash/rebase/pop. Not a subagent issue — bash
+  quirk, worth remembering.
+
+* **Platform team's `QUARTERMASTER_DB_URL` example had three slashes.**
+  Comment on #25 wrote `sqlite:///data/quartermaster.db` (three =
+  relative). For an absolute path in the container you need four
+  (`sqlite:////data/quartermaster.db`). Flagged in #29's body so the
+  compose writer doesn't copy the wrong spelling.
+
+* **Commits on a long branch, reviewer's recommendation: don't
+  squash.** The end-of-branch reviewer explicitly argued against
+  squashing the 12 commits — the fix commits (20bca13, bfe9ed4) tell
+  a real story about what came up in review. I'd reflexively have
+  squashed; the case for preserving was more compelling. Left as-is.
+
+## Concerns & Open Threads
+
+* **No end-to-end test of the full deploy path.** We have formatter-
+  level tests, filter-level tests, and a manual uvicorn smoke test
+  (verified one JSON access log line). What we don't have is a test
+  that builds the container, runs it, curls `/healthz`, and asserts
+  on the captured stdout. That's #28 + #29 + #30 territory; the Actions
+  workflow's post-deploy `curl` step will be the first real end-to-end
+  assertion.
+
+* **Deprecation warning is fixed, but we're still using
+  `pythonjsonlogger.json` — a 4.x module path.** If the library ever
+  does another reorg or drops the API we're using, the log format
+  quietly breaks. `python-json-logger` is maintained but small; worth
+  pinning to a range (`>=3.2,<5`) in `pyproject.toml` if we ever hit
+  a 5.x migration.
+
+* **The intake form's §3.7 still says "Endpoint does not exist yet
+  — will land in the repo before the first deploy cut."** Harmless
+  because the issue is closed, but stale. If we ever revisit the
+  form as a template for another app, clean that up.
+
+* **Session memory about TDD enforcement.** I've been saving feedback
+  memories about user-specific patterns. This session reinforced that
+  the subagent-driven skill's TDD gate works when prompts explicitly
+  require failing-first verification. Saving the pattern is worth it,
+  but I'm wary of over-memoing the workflow meta; Jeff's CLAUDE.md
+  global already prefers "do the work, don't narrate the workflow."
+
+* **Rate-limit numbers still open.** Filed as a platform-team ask on
+  #25; the response didn't address numbers specifically but the
+  middleware is deployed at `10/30 per-IP` (matches my starter
+  proposal in the intake). If that's wrong for this tenant we'll hear
+  about it when real traffic hits.
+
+* **CLAUDE.md Session Log is out of date.** The file has a Session 1
+  entry; Session 2's wiki page exists now but CLAUDE.md still reflects
+  pre-session state. Left unmodified this session because the CLAUDE.md
+  working-tree diff was Jeff's pre-session edit; merging my own
+  Session 2 references on top would have entangled our changes. Next
+  session he'll want to land both (his stale edits + a Session 2 bullet
+  in the log).
+
+## Raw Thinking
+
+* **The intake form's "explain what you've already tried" structure
+  was load-bearing.** When Jeff asked me to "fill out what I can and
+  ask questions," the right shape was a draft-with-question-list,
+  not a comment dump. Surfacing six specific binary-ish questions
+  ("option A or B?") compressed a long back-and-forth into one
+  round-trip. This pairs with his "minimalist answers" pattern from
+  Session 1: if I'm clear about my defaults, he answers by approving
+  or swapping; if I'm vague, I get silence and ship the wrong thing.
+
+* **Subagent-driven felt like overkill for Task 1 (dep bump) and
+  Task 3 (test-only additions) — but it caught real issues anyway.**
+  The Task 2 code reviewer flagged the `pythonjsonlogger.jsonlogger`
+  deprecation before we'd written a line of production code that
+  depended on it. The Task 5 reviewer caught the autouse fixture
+  wrong. These catches would have leaked through "just write the
+  commit" execution. The cost was roughly 2-3x the token budget of
+  direct execution; the quality delta was worth it on a branch that
+  needs to work in prod.
+
+* **The spec-and-plan artifacts had real value beyond process
+  ceremony.** Each implementer subagent got pasted a task body of
+  100-200 lines that was self-contained: exact file paths, exact
+  code, exact commit message, verification commands. No subagent
+  asked "what should the format string be" or "what fields should
+  the filter set." That prep-once-execute-many pattern is what makes
+  subagent-driven work at all. The plan file is almost a shared
+  cache across subagents.
+
+* **Platform contracts are surprisingly lightweight when one tenant
+  already shipped.** Archon went through this first, so the intake
+  form inherited structure, the wiki template existed, and the
+  platform-team response was mechanical. For the Quartermaster
+  tenant this worked out to maybe an hour of thinking and a morning
+  of execution. Future tenants should benefit more.
+
+* **The Traefik-not-FastAPI auth choice ripples into the code.**
+  Because auth lives at the edge, `/healthz` stays unauthenticated
+  with zero effort inside the app, and there's no session middleware
+  or login template to build. This is why "infrastructure-level
+  auth" is such a good default for small single-user tools —
+  the app stays boring.
+
+## What's Next
+
+Priority order for the next session:
+
+1. **#28 Dockerfile.** Run as `USER 1000:1000`, Alembic + uvicorn
+   entrypoint, `HEALTHCHECK` hitting /healthz. Local build + run
+   smoke test. Should be small.
+2. **#29 compose.yml.** Consumes #28. The bulk of the Traefik labels,
+   resource limits, required container labels. Mind the four-slash
+   `QUARTERMASTER_DB_URL`.
+3. **#30 Forgejo Actions deploy workflow.** Build, tag by git SHA,
+   push to the Forgejo registry, SSH to home-ctr-onyx, `docker compose
+   pull && up -d`, post-deploy `curl /healthz`. First real end-to-end
+   deploy test.
+4. **First production rollout.** Flip the DNS, hit the live URL
+   through Traefik, verify basic auth works, verify JSON logs flow
+   into Loki with `event`/`level` as labels. Should be uneventful;
+   the interesting part was the work leading up to it.
+5. **#31 cleanups.** Fold into whichever follow-up PR naturally
+   touches `service.py` or `routes_health.py`.
+6. **Deferred items from #1 still open.** Constrain posting dates to
+   the month, closed-month archive treatment, cross-month
+   summaries. Nothing about this session disturbed the priority of
+   those.