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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-04 21:07:04 +01:00

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Decision: Unit-Anchor Rollout Phase 1 (MachineGroup, PumpingStation, Valve, ValveGroupControl)

Date: 2026-02-24
Scope:
- nodes/machineGroupControl/src/nodeClass.js
- nodes/machineGroupControl/src/specificClass.js
- nodes/pumpingStation/src/nodeClass.js
- nodes/pumpingStation/src/specificClass.js
- nodes/valve/src/nodeClass.js
- nodes/valve/src/specificClass.js
- nodes/valveGroupControl/src/nodeClass.js
- nodes/valveGroupControl/src/specificClass.js

Context

After adopting canonical-unit anchoring in rotatingMachine, adjacent controller nodes still mixed local units, unitless writes, and implicit conversions. That left cross-node behavior sensitive to registration order and source-unit assumptions.

Decision

Apply the same canonical storage policy per node:

internal storage in canonical units (Pa, m3/s, W, K where relevant),
preferred/output units for operator-facing status and output payloads.

Enable strict measurement ingress discipline on migrated nodes:

strictUnitValidation: true,
throwOnInvalidUnit: true,
required unit for physically dimensional types (flow, pressure, power, temperature, and node-specific equivalents).

Replace unitless runtime writes/reads with explicit-unit helpers in each node’s domain class, including child-machine/child-valve interactions.

Consequences

Cross-node calculations now run against a deterministic unit anchor in phase-1 nodes.
Status/output values remain in preferred/output units, while internal math stays canonical.
Legacy paths that send dimensional values without units now fail fast instead of silently coercing.

Rollback Notes

Revert the eight files listed in scope.
Restore previous MeasurementContainer initialization (non-canonical, non-strict behavior) in each node.
Remove helper-based explicit unit reads/writes and revert to prior direct chain usage.

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