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Khalim Conn-Kowlessar cda469dd7d slice 16e: predicted_total_fuel_cost / predicted_ecf / predicted_log10_ecf 
ECF reconstruction per SAP10 §20.1 (Mid physics, ADR-0008):

  total_cost_gbp = (space_kwh*p_space + dhw_kwh*p_dhw + light_kwh*p_elec) / 100
  ECF = 0.42 * total_cost / (TFA + 45)
  log10_ecf = log10(ECF)   [0 for non-positive]

p_* are Table 32 unit prices via fuel_unit_price_p_per_kwh. Standing
charges deliberately omitted (constant fuel-mix offset; ADR-0008).

predicted_sap_score is NOT emitted as a feature (ADR-0008 Mid not Deep):
the model is left to learn the piecewise log/linear transform from
log10_ecf -> SAP itself, keeping the data layer SAP-version-agnostic.

VERSION 0.3.0 -> 0.4.0 (MINOR).
2026-05-17 12:00:06 +00:00
..
domain slice 16e: predicted_total_fuel_cost / predicted_ecf / predicted_log10_ecf 2026-05-17 12:00:06 +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/.