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Khalim Conn-Kowlessar 550b1fbcd0 P5.11: SapResult.intermediate exposes PV export credit 
Final P5 slice. PV credit was the missing term linking the per-end-use
fuel costs (P5.6) to the top-level total_fuel_cost_gbp: total =
max(0, sum(per-end-use) − pv_credit). With this key, every step of
the §13 cost chain — per-fuel cost → PV credit → total → ECF →
rating — is auditable from `intermediate`. P5 trace exposure is
complete.
2026-05-19 10:41:18 +00:00
..
domain P5.11: SapResult.intermediate exposes PV export credit 2026-05-19 10:41:18 +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/.