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A dwelling's heating is one conceptual system, but its fields are scattered across EpcPropertyData (a gov-API schema mirror): the cluster on sap_heating, the electricity tariff on sap_energy_source.meter_type, hot-water flags loose at top level. Three places synthesise a heating system — Measure Options, Landlord Overrides, EPC Prediction's donor — and each hand-copied a different ad-hoc subset. The override and donor both dropped meter_type, so an electric-storage system landed on the template's single-rate meter and billed overnight heat at the peak rate: property 713406 scored SAP 13 (G) vs ~50 (E), inflating the HHRSH measure to +45.8 and overshooting the plan to band A. Establish a single Coherent Heating System boundary (CONTEXT.md) that every synthesiser must cover, with a source-appropriate fill policy (ADR-0035): - Override overlay *completes* the partial system the landlord named. Companion fields are now DERIVED from the SAP code, not hand-attached per archetype: the off-peak meter from the calculator's single off-peak classification (new OFF_PEAK_IMPLYING_HEATING_CODES = SAP §12 Rules 1-2), and an unobserved storage charge control defaults to the conservative manual control (Table 4e 2401). So adding a heating archetype is just adding its code — companions can't be forgotten. A contract test guards it (every off-peak code drags a Dual meter). - Prediction's heating donor now *carries* the donor's meter_type alongside its sap_heating cluster — the donor is already coherent. Coherence is a synthesis-time obligation only; the calculator still scores a real lodged cert exactly as lodged. Verified on 713406: baseline 13 -> 47.8 (E), matching its recorded rating; the phantom HHRSH recommendation is gone and the plan no longer overshoots to A. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| .. | ||
| adr | ||
| backlog | ||
| grill-sessions | ||
| migrations | ||
| HANDOVER_API_ACCURACY_S2.md | ||
| HANDOVER_API_FETCH_AND_REPORT.md | ||
| HANDOVER_API_PROFILING.md | ||
| HANDOVER_ARA_NEXT.md | ||
| HANDOVER_EPC_PREDICTION.md | ||
| HANDOVER_EPC_PREDICTION_WIRING.md | ||
| HANDOVER_MODELLING.md | ||
| HANDOVER_NEXT_PHASE_PROMPT.md | ||
| HANDOVER_REAL_LIFE_CERT_ACCURACY.md | ||
| HANDOVER_SUMMARY_AUDIT.md | ||
| MIGRATION_NOTE_predicted_epc_source.md | ||
| PR_NOTE_system_built_basement_1177.md | ||