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Khalim Conn-Kowlessar 1a6996abbb slice S-B12: water-heating eff inherits main_heating_category cascade 
The legacy water_heating_efficiency(901, main_code) returns 0.80 (gas
boiler default) when sap_main_heating_code is None — even if the main
system is a heat pump (category=4, efficiency 2.30). For "from main
system" water codes (901/902/914), we must inherit through the FULL
main-heating cascade including the category fallback.

Discovered by hand-tracing cert 0320-2850 (Semi-detached bungalow,
heat-pump main with no SAP code lodged, actual SAP 70, predicted 49).
HW was being charged at 0.80 eff for a 2.30-eff dwelling — 2.9× too
much HW fuel.

100-cert parity probe:
  MAE 4.66 → 4.53   (-0.13)
  RMSE 6.27 → 5.96
  bias -0.70 → -0.57
  within ±10: 94% → 95%

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-18 15:48:42 +00:00
..
domain slice S-B12: water-heating eff inherits main_heating_category cascade 2026-05-18 15:48:42 +00:00
fetchers added potential file scaffolding: 2026-05-15 10:56:53 +00:00
repos added potential file scaffolding: 2026-05-15 10:56:53 +00:00
utils added potential file scaffolding: 2026-05-15 10:56:53 +00:00
README.md added potential file scaffolding: 2026-05-15 10:56:53 +00:00

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/.