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Khalim Conn-Kowlessar af6fcfb190 Cohort residual slice 2: cert→ventilation cascade closes useful kWh on all 6 fixtures 
Surfaces four cert lodgements that the §2 ventilation cascade was
missing on the cert→inputs path. Without them, `cert_to_inputs` was
defaulting:
  - extract_fans_count    → 0  (PDF: 1-2 fans per fixture)
  - percent_draughtproofed → 0  (PDF: 75-100% per fixture)
  - sheltered_sides        → 2  (PDF: 1-3 per fixture — hardcoded TODO)
  - has_suspended_timber_floor → False (PDF: True on 000477/000487)

Net effect on (25)m monthly effective ACH ranged from -19% (000477)
to +5% (000490) → propagated 1:1 through HLC × ΔT → useful space heat
→ main + secondary fuel kWh → cost / SAP integer.

Schema:
- `SapVentilation` gains 4 new optional fields: `sheltered_sides`,
  `has_suspended_timber_floor`, `suspended_timber_floor_sealed`,
  `has_draught_lobby`. RdSAP cert lodges these but the type didn't
  surface them.
- `cert_to_inputs.cert_to_inputs` reads them when set; falls back to
  the SAP10.2 §2 worst-case defaults (sheltered=2, no timber floor,
  no draught lobby) when the cert hasn't lodged. Removes the long-
  standing `sheltered_sides=2` hardcode + 4 TODOs.
- `make_minimal_sap10_epc` accepts a `sap_ventilation` kwarg.

Per-fixture build_epc() updates lodge the U985 PDF values verbatim.

E2E pin: new parametrized test
`test_elmhurst_cert_to_inputs_monthly_infiltration_ach_matches_u985_
worksheet` asserts `inputs.monthly_infiltration_ach[m] == LINE_25_
EFFECTIVE_ACH[m]` at abs=1e-3 across all 6 fixtures + 12 months
(72 assertions). All pass.

Useful space heating drift:
  000474: useful 10821.69 → 10765.85 (Δ -55.8 kWh vs PDF 10612.86 → +1.4% over, was +2.0%)
  000490: useful 11262.05 → 11184.06 (Δ -78.0 kWh vs PDF 11183.28 → +0.007% — essentially exact)

SAP integer status:
  000474: 62 = PDF 62 (delta 0) ✓
  000490: 58 vs PDF 57 (delta 1; continuous 57.77 vs 57.40)
          — remaining residual is pumps_fans hardcoded at 130 kWh
          vs PDF 160 (Table 4f cascade not yet implemented → -£4 cost
          + 0.3 continuous SAP). Next slice.

Tightens `result.secondary_heating_fuel_kwh_per_yr` pin abs=10 → abs=0.1
(was loose to absorb the +0.7% useful overshoot which has now closed).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-22 11:15:31 +00:00
..
domain Cohort residual slice 2: cert→ventilation cascade closes useful kWh on all 6 fixtures 2026-05-22 11:15:31 +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/.