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Khalim Conn-Kowlessar 4b83e7023f §6 slice 2: solar_gains_from_cert orchestrator (000490 line (83) ≤5e-3 W) 
Adds RoofWindowInput + RooflightInput + SolarGainsResult dataclasses and
the solar_gains_from_cert orchestrator. Aggregates per-orientation sums
from epc.sap_windows (Table 6b/6c/6d lookups internal); roof windows take
explicit pitch (RdSAP10 Table 24 default 45°, Z=1.0) and rooflights are
horizontal per SAP10.2 §U3.2 p128 (pitch=0°, Z=1.0).

Driven by U985-0001-000490 worksheet (83) total solar gains 12-tuple to
abs=5e-3 W (audit reconciled the underlying flux + window-gain leaves to
≤5e-5 W; the 5e-3 W budget is the conformance ceiling for §6).

Table 6b g⊥ values are corrected vs cert_to_inputs._window_inputs (which
ships 0.72 for codes 2&3 — the spec is 0.76 for "Double glazed (air or
argon filled)"). The legacy lookup dies in slice 8 when _window_inputs
is deleted.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-20 20:28:46 +00:00
..
domain §6 slice 2: solar_gains_from_cert orchestrator (000490 line (83) ≤5e-3 W) 2026-05-20 20:28:46 +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/.