Step 2: Plan the Energy Monitor

We run the plan command:

/auro.plan

The agent reads the charter and generates charters/1-energy-monitor/plan.md.

Technical Context

Language: TypeScript 5.4
Dependencies: React 18, Vite, Express, better-sqlite3, Chart.js
Storage: SQLite (single file, no server needed)
Testing: Vitest + Testing Library
Platform: Web browser + Node.js server
Type: Full-stack web dashboard
Performance: < 200ms API response, < 2s real-time update
Constraints: Runs on a single Raspberry Pi
Scale: Single household, ~1 reading per second

Constitution Check

Gate	Status	Notes
Simplicity (VII)	PASS	2 projects (backend + frontend), under the 3 limit
Anti-Abstraction (VIII)	PASS	Using better-sqlite3 directly, no ORM layer
Integration-First (IX)	PASS	Contracts defined for all API endpoints

Data Model (data-model.md excerpt)

Reading
  - id: integer, primary key
  - timestamp: datetime, indexed
  - value_kw: float, required
  - created_at: datetime

AlertConfig
  - id: integer, primary key
  - threshold_kw: float, required
  - updated_at: datetime

API Contracts (contracts/ excerpt)

GET /api/readings?from=&to=
  Response: { readings: [{ timestamp, value_kw }] }

GET /api/readings/current
  Response: { timestamp, value_kw }

GET /api/alerts/config
  Response: { threshold_kw }

PUT /api/alerts/config
  Body: { threshold_kw }
  Response: { threshold_kw }

All gates pass. On to Step 3: Tasks.