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When the main heating is electric storage / direct-electric (codes
191-196, 401-409, 421-425), the cert almost always carries an
Economy-7 tariff and the immersion HW cylinder runs on the off-peak
timer. Bill HW at the 7h-low rate (5.5 p/kWh) in that case, falling
back to the lower of {7h-low, water_heating_fuel rate} so we never
over-charge an HW fuel that's already cheaper than off-peak.
100-cert parity probe:
MAE 4.90 → 4.66 (-0.24)
bias -1.44 → -0.70 (over-correction halved)
within ±3: 46% → 48%
within ±5: 67% → 68%
within ±10: 93% → 94%
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| .. | ||
| domain | ||
| fetchers | ||
| repos | ||
| utils | ||
| README.md | ||
Shared packages
Workspace packages consumed by services/*. Each package is its own Python distribution with its own pyproject.toml; services import via the workspace dependency mechanism ({ workspace = true }).
| Package | Purpose |
|---|---|
domain/ |
Shared domain types — Property, BaselinePerformance, Plan, Scenario, EpcPropertyData, etc. No persistence, no IO, no business logic. |
repos/ |
Persistence layer — one repo per aggregate. Owns the SQL. Depends on domain. |
fetchers/ |
External API clients (gov EPC, Ofgem, Google Solar, etc.). Depend on domain for response shapes. |
utils/ |
Cross-cutting infra — logging, S3, CloudWatch URL builders, SQS task helpers. |
Adding a new shared package
Only when a real second consumer materialises. Don't pre-shatter (repos-epc, repos-property, ...) — split when a deployment needs to drop a dep, not before.
See ../ara_backend_design.md §11 for the broader monorepo layout and ../CONTEXT.md for the domain glossary that names the types living in domain/.