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Khalim Conn-Kowlessar ac6dd250a2 Slice 27: §8 space heating cascade pin (36/36) + worksheet annual rule 
Adds `space_heating_section_from_cert(epc)` to the cert→inputs cascade
mirroring `mean_internal_temperature_section_from_cert`. Composes §1
(dim) + §2 (ventilation) + §3 (HLC) + §5+§6 (gains) + §7 (MIT + η_whole)
+ climate and threads through `space_heating_monthly_kwh`.

Pins (95)/(97)/(98a)/(98c) monthly + (98c) annual + (99) per-m² against
the U985 PDF at abs=1e-4 for all 6 fixtures — 36/36 PASS.

Worksheet annual rule: the U985 PDF lodges (98a)_m / (98c)_m at 4 d.p.
half-up and reports the annual as the Σ of those displayed monthlies. The
full-precision Σ diverges from the lodged annual by up to ~1.4e-4
(accumulated 4-d.p. display rounding over 8 heating months) — e.g. 000490
= -0.000132. Empirically, `sum(round_half_up(monthly, 4))` reproduces the
lodged annual EXACTLY for all 6 fixtures (residual = 0 by construction).
The full-precision residuals are randomly distributed in ±1.4e-4 with no
bias — 5/6 cancel below 1e-4 by luck, 000490 lost the lottery.

SAP10.2 Table 9c step 10 (p.184) defines (98a)_m without an explicit
annual aggregation rounding rule; matching the worksheet display
convention is the only consistent interpretation that satisfies the
abs=1e-4 pin bar. The 1.2e-8 relative shift on downstream calcs is
negligible.

Cascade scoreboard: 312/312 → 348/348 (§7 60/60 + §8 36/36 now closed).
e2e SapResult: 56/66 unchanged (downstream §10a/§11a/§12 + 000487
defects await later slices).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-23 23:57:55 +00:00
..
domain Slice 27: §8 space heating cascade pin (36/36) + worksheet annual rule 2026-05-23 23:57:55 +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/.