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Khalim Conn-Kowlessar 67a4f92d53 slice 16b: sap_efficiencies.py with Table 4a/4b/32 lookups 
Encodes SAP10.2 Table 4a (heating-system code -> space-eff %), Table 4b
(gas/oil boiler winter eff %), and Table 32 (fuel-code -> p/kWh).

Helpers:
- seasonal_efficiency(code) -> decimal; unknown -> 0.80 (gas-boiler typical)
- water_heating_efficiency(water_code, main_code) -> decimal; codes
  901/914 inherit the main code's efficiency
- fuel_unit_price_p_per_kwh(fuel_code) -> p/kWh; unknown -> 3.48 (mains gas)

All returns are total. Provides the seasonal-efficiency input to slice 16d
and the price multipliers for slice 16e's cost reconstruction.
2026-05-17 11:45:40 +00:00
..
domain slice 16b: sap_efficiencies.py with Table 4a/4b/32 lookups 2026-05-17 11:45:40 +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/.