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Khalim Conn-Kowlessar 74bfac049a Slice 30: §10a fuel costs cascade pin (192/192) + electric-shower plumb 
Adds `fuel_cost_section_from_cert(epc)` (delegates to `cert_to_inputs`
which already wires `_fuel_cost` with full upstream context). Pins
(240a)..(255) — 32 line refs × 6 fixtures = 192 cascade pins, all PASS.

Three calculator changes needed for closure:

1. Electric shower (247a) — for 000487 the cert lodges 1 electric shower
   and the PDF reports (247a) = 79.3036 GBP (= (64a)m × std electricity
   price). The §4 cascade already computes electric-shower kWh via
   App J step 8 (slice 25d); now exposed on `WaterHeatingResult` as
   `electric_shower_kwh_per_yr` and plumbed into `_fuel_cost`. The
   instant-shower input was previously hardcoded to 0.

2. (241a/241b) main 2 + (242a/242b) secondary fractions — when a row's
   kWh is zero the PDF reports BOTH high/low fractions as 0 (not 1/0).
   `_split` in fuel_cost now zeros both fractions when kwh_per_yr <= 0.
   Cost columns already collapse via multiplication, so this is
   presentation-only.

3. (242a/242b) secondary fractions for 000474 — same pattern: when no
   secondary system is lodged, both fractions = 0.

Adds §10a LINE_ constants to all 6 fixtures. Extracted from
`sap worksheets/U985-0001-NNNNNN.txt` PDF blocks.

Cascade scoreboard: 468/468 → 660/660 (§7..§10a closed).
e2e SapResult: 6 remaining failures (all `co2_kg_per_yr`, await §12).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-24 00:42:52 +00:00
..
domain Slice 30: §10a fuel costs cascade pin (192/192) + electric-shower plumb 2026-05-24 00:42:52 +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/.