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Khalim Conn-Kowlessar 2fd0fe1c08 §3 exact conformance: non-RR LINE_31 + LINE_36 match Elmhurst worksheets 
LINE_31 (total external element area) = Σ_parts (gross_wall + roof +
floor). Window and door areas cancel in the net-wall expansion, so LINE_31
is independent of the window/door split. This lets us assert the exact
Elmhurst worksheet (31) for the two non-RR fixtures (000474, 000490)
without needing window-area input data.

LINE_36 = y × LINE_31 follows for free. Both 000474 and 000490 use age
band B throughout (y = 0.15), giving:
  000474: 0.15 × 153.39 = 23.0085
  000490: 0.15 × 164.85 = 24.7275

The per-storey-perimeter fix (e6c768c3) was the prerequisite; without it,
upper storeys with a smaller perimeter than the ground floor were
over-counted (e.g. 000474 Main: 7.07 m ground vs 5.27 m first storey).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-20 12:47:01 +00:00
..
domain §3 exact conformance: non-RR LINE_31 + LINE_36 match Elmhurst worksheets 2026-05-20 12:47:01 +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/.