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Khalim Conn-Kowlessar 13c2c6514f §7 slice 2: two-main case 1 weighted-R per Table 9b 
Adds secondary_fraction (203) + secondary_responsiveness orchestrator
params. When both main systems heat the whole house (Table 9c case 1),
the u-formula consumes a weighted responsiveness:
  R_eff = (1 - (203)) × R_primary + (203) × R_secondary

Synthetic equivalence test pins the contract: any (frac, R_primary,
R_secondary) call lands the same MIT as a single-main call with the
weighted R. No fixture exercises case 1 (all 6 Elmhurst = single combi),
so secondary_fraction defaults to 0 → identity behaviour.

Case 2 (different parts heated separately) deferred — needs (203) >
1-(91) branch + conditional T_2 averaging + per-system Table 4e
adjustment. No fixture data to drive.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-20 21:30:37 +00:00
..
domain §7 slice 2: two-main case 1 weighted-R per Table 9b 2026-05-20 21:30:37 +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/.