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Khalim Conn-Kowlessar aff678e8eb §4 slice 1: assumed_occupancy (worksheet line (42), Appendix J) 
First slice of the §4 worksheet-driven rewrite (xlsx rows 207-304).
New module `domain/sap/worksheet/water_heating.py` lands the line-ref
mapped functions; subsequent slices append below.

`assumed_occupancy(tfa)` implements the SAP10.2 Appendix J Table 1b
piecewise formula. Validated against:
  - canonical xlsx worked example  (TFA Q23 → N U209)
  - Elmhurst U985-0001-000474       (TFA 56.79 → N 1.8896)
  - Elmhurst U985-0001-000490       (TFA 66.06 → N 2.1468)
  - boundary case TFA ≤ 13.9        (N=1 floor)

The legacy `domain.ml.demand._default_occupants_sap_j` mirror stays in
place until the §4 worksheet rewrite is complete; both sources will be
reconciled in a later slice once dependent callers move over.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-20 15:27:03 +00:00
..
domain §4 slice 1: assumed_occupancy (worksheet line (42), Appendix J) 2026-05-20 15:27:03 +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/.