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Slice 1 of Bill Derivation — the reference-data foundation that later slices price the calculator's per-end-use kWh against: - Fuel enum (canonical billing fuels; the join key between the calculator's SAP-code fuels and the rates snapshot). COAL + HEAT_NETWORK are members with no national rate. - FuelRates value object: unit_rate_p_per_kwh / standing_charge_p_per_day / seg_export_p_per_kwh; raises UnpricedFuel on a fuel it has no rate for rather than billing at a wrong default. - FuelRatesRepository port (ADR-0011 Repo-reads-stored-reference-data) + StaticFileFuelRatesRepository reading a committed JSON snapshot. - Snapshot fuel_rates_2026_q2.json: GB national, Apr-Jun 2026 Ofgem cap (gas/electricity) + DESNZ/NEP May 2026 (off-gas). Carries the full researched data; the value object exposes single-rate fuels this slice. Off-peak (day/night), house coal and heat network raise UnpricedFuel until later slices. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| .. | ||
| applications | ||
| domain | ||
| infrastructure | ||
| orchestration | ||
| repositories | ||
| utilities | ||
| __init__.py | ||
| conftest.py | ||
| test_lambda_packaging.py | ||