4826255672
Verified on lin001 over SSH on 2026-08-20, read-only: - Port 502 is bound to 10.0.0.17, not 0.0.0.0, so unauthenticated Modbus is not internet-reachable at the Docker level. This was an open risk in §3 and an unchecked item in §15; it is now a confirmation. openplc-runtime also publishes 8443 (the Runtime web UI) on the same private address, which the spec did not mention. - openplc-runtime is not the only published port on the host: caddy, wireguard, mosquitto and chirpstack-gateway-bridge all publish on 0.0.0.0. The no-published-ports rule still applies in full to what we build, but the "one deliberate exception" framing was wrong and invited over-reading. - Port 22 is open to the internet. Added to §15 as an open item for the same NSG review. - 21 containers running, not 22; no stopped containers. - /datadisk is 46% used with InfluxDB at 55 GB, up from 43%/52 GB. Recorded the growth rate so it can be budgeted for. CLAUDE.md restates two of these rules and is updated to match. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
62 lines
4 KiB
Markdown
62 lines
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Markdown
# CLAUDE.md — rules to keep front of mind
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Plant Operations Assistant for the **Waterloo Road Pump Station (WRPS)**, deployed onto an
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existing, live, shared Docker host. Full detail: `BUILD-AI-CONTAINERS.md` (the build spec) and
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`YAU_Linux_Host_Onboarding.md` (the host brief). **Where the two conflict, the host brief wins.**
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## The three lines this system does not cross
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1. **No instructions for safety-critical actions.** Procedural questions get document identity,
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revision, effective date and verbatim prerequisites — never synthesised steps.
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2. **No recommended setpoints or operating parameters.** Advisory questions get evidence, ranges,
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outcomes, documented limits, then an explicit deferral. Never a number presented as the answer.
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3. **No answers outside the evidence.** Zero rows means "no records found", never a plausible figure.
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These are **code paths, not prompt instructions.** A safety rule living only in a prompt is not
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implemented. The classifier runs first; each class has a Pydantic contract validated in Python
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after generation and before returning. Contract failure -> regenerate once -> error. Never return.
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When class is uncertain, choose the **more restrictive** class. Procedural beats Reference.
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Advisory beats Historical. Partly-advisory is advisory.
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## Host rules — inherited, non-negotiable
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- Growing data goes on **`/datadisk`**, never `/`. Root is 62 GB and has hit 100% before.
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- **No published host ports for anything we build.** Join the external `proxy` network, reach it
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through Caddy. Some existing containers do publish (`caddy`, `wireguard`, `mosquitto`,
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`chirpstack-gateway-bridge`, `openplc-runtime`) — they carry non-HTTP protocols. We do not.
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- **Never omit `import authelia`** from a Caddyfile block — it silently makes a service public.
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- `~/authelia/configuration.yml` is **root-owned**: `sudo`, back up as `.bak-<purpose>-<date>`.
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Restarting Authelia **logs out every active user** — announce it first.
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- AD group membership must be **DIRECT**. Nested membership silently fails.
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- `pg-ai` and `cube` are pinned — **do not add them to Watchtower's update list**.
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- **`openplc-runtime` is live control for this demo.** Never restart, update or reconfigure it as
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a side effect of AI work. Do not copy its published-port pattern, and never change its
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`10.0.0.17` binding to `0.0.0.0` — that binding is what keeps unauthenticated Modbus off the
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internet.
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- Never install on, write to or restart `cicore1`. Never exceed read-only on `imh`.
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- **No secrets in Git, compose files, logs or error messages.** `0600` env files under `~/ai/`.
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## Verification
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`docker ps` showing "Up" is **not** proof. `curl -sI` the public URL, expect `302` to the auth
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portal, and read the container logs. Prove each layer without the LLM first: prove Cube returns
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the right number by hand, prove retrieval finds the right procedure by hand, *then* wire the agent.
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## Working conventions
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- Prefer additive changes. Snapshot config before editing.
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- **Do not invent schema.** `imh` is pending — inspect it, or ask. Fixtures are marked as fixtures.
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- Store UTC. Convert to `SITE_TIMEZONE` exactly once, in Cube. Never do timezone maths in a prompt.
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- Fix failures in the classifier, Cube or ingestion — **not by adding instructions to the prompt.**
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- When something fails, add the failing case to `eval/testset.jsonl` *before* fixing it.
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- Small commits, one concern each. If a change alters an accepted phase, re-run that phase's gate.
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## The plant
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Waterloo Road Pump Station: a three-pump wastewater station. Wet well `WW-101` (0–7000 mm,
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120 m³/m), duty/assist/assist pumps `PU-301/302/303` on a common VSD speed reference, discharging
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through manifold `MAN-301` against 22 m static lift. Spill weir at 6000 mm, `LSHH-102` at 5500 mm.
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Control runs on `openplc-runtime`; Yokogawa CI Server on `cicore1` polls it over Modbus TCP and
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historises the result. Source of truth for tags: `db/seed/tags.csv`, derived from
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`WRPS/04-plc/register-map.csv` and `WRPS/05-scada/modbus/scada-points.csv`.
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