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Khalim Conn-Kowlessar fa5bdcc26f slice S-A2: dimensions module (SAP 10.3 §1) 
Second slice of the SAP10 Calculator Session A (ADR-0009). Ships a frozen
Dimensions dataclass + dimensions_from_cert(epc) pure function under
domain/sap/worksheet/. Aggregates geometry across every sap_building_parts
entry (main dwelling + each extension): total floor area, volume, storey
count, area-weighted average storey height, ground/top floor area,
ground-floor heat-loss perimeter, gross wall area, party wall area.

Top-level epc.total_floor_area_m2 is the authoritative TFA; per-storey
sums drive the wall-area calculations. Volume = TFA × avg_storey_height.

5 AAA cycles cover: single-storey single-part, two-storey scaling,
main+extension aggregation, empty-cert fallback to default 2.5 m height,
and a non-default-height terrace exercising party-wall scaling.

Edge cases (porches, conservatories, integral garages, RIR storey
treatment) deferred to later slices per ADR-0009 Session A scope.
2026-05-17 21:49:29 +00:00
..
domain slice S-A2: dimensions module (SAP 10.3 §1) 2026-05-17 21:49:29 +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/.