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Khalim Conn-Kowlessar a41ac6bd74 Cohort residual slice 4: SAP 10.2 rating constants — 000490 closes to delta=0 
Replaces the SAP 10.3 §13 rating constants in `worksheet/rating.py`
with SAP 10.2 values per ADR-0010 (active spec target is SAP 10.2,
14-03-2025; spec changed to SAP 10.3 only as of 13-01-2026 which
hasn't been adopted):

  Energy Cost Deflator         0.36 → 0.42
  Linear branch slope          16.21 → 13.95   (SAP = 100 − slope × ECF)
  Log branch intercept         108.8 → 117.0   (SAP = intercept − slope × log10(ECF))
  Log branch slope             120.5 → 121.0

The two errors were near-cancelling on the Elmhurst cohort (low-cost
combi-gas dwellings on the linear branch): the wrong deflator made
our ECF ~14% low, and the wrong linear slope made our SAP drop per
unit ECF ~16% high. Their product was close to the spec but not
exactly — leaving 000490 stuck 1 SAP integer over PDF after the
other component closures (Appendix L, secondary heating, ventilation,
pumps_fans) had brought cost to within £0.04 of PDF.

Final cohort SAP integer status — **both fixtures hit delta=0**:

  000474:  integer 62 = PDF 62 (continuous 61.91 vs PDF 62.26, Δ -0.35)
  000490:  integer 57 = PDF 57 (continuous 57.40 vs PDF 57.40, Δ -0.002)

000490 e2e SAP integer ceiling tightened 1 → 0.

Updated 8 internal rating + calculator tests that pinned the SAP 10.3
constants (test_rating.py, test_calculator.py, test_bre_worked_
examples.py). All 685 tests green; 0 xfail.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-22 11:25:38 +00:00
..
domain Cohort residual slice 4: SAP 10.2 rating constants — 000490 closes to delta=0 2026-05-22 11:25:38 +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/.