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Khalim Conn-Kowlessar 831ebac2ae slice 18d: seasonal_efficiency category fallback for null SAP code (v2.6.0) 
Many real certs carry main_heating_category=4 (heat pump) but null
sap_main_heating_code, so seasonal_efficiency() was returning the 0.80
gas-boiler default — a 3x COP under-count that dragged the high-SAP
heat-pump tail. Adds main_heating_category + main_fuel_type fallbacks:
cat=4 -> 2.30, cat=7 -> 1.00, cat=10 routes by fuel
(electric=1.00, gas=0.55, oil=0.65), cat=5 warm air -> 0.76.
Explicit SAP codes still win.
2026-05-17 18:13:47 +00:00
..
domain slice 18d: seasonal_efficiency category fallback for null SAP code (v2.6.0) 2026-05-17 18:13:47 +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/.