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Slice 5b: update the FE-owned migration spec so the other repo can create the bill columns in parallel. - Bill block: per-section delivered kWh + cost (heating, hot water, lighting, appliances, cooking, pumps/fans, cooling) + standing_charges_gbp, seg_credit_gbp, total_annual_bill_gbp, fuel_rates_period. - space_heating_kwh / water_heating_kwh (RHI recorded demand) marked SUPERSEDED by heating_kwh / hot_water_kwh (calculator delivered fuel); kept until the bill populates, then dropped. - Cooling section kept (mostly 0 but affects the bill, cheap to store). - Records the calculator-load-bearing posture (effective_* may differ from lodged_* for pre-10.2) and that columns are defined now / populated when the SapResult->EnergyBreakdown adapter + BillDerivation wiring land. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
71 lines
4.4 KiB
Markdown
71 lines
4.4 KiB
Markdown
# `property_baseline_performance` table — FE-owned migration
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**Context:** Slice 6 (Hestia-Homes/Model#1135) of the `ara_first_run` rebuild. The
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`PropertyBaselineOrchestrator` establishes a Property's **Baseline Performance** (ADR-0004) and persists it
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via a new `PropertyBaselineRepository` port. This is a brand-new table — no predecessor.
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Per ADR-0004's amendment, the lodged/effective pair does **not** land on `property_details_epc`
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(which is being retired as too coupled to the legacy EPC-API schema). It lands here, as its own
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aggregate's table.
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The SQLModel row is defined in `infrastructure/postgres/` so the ephemeral-Postgres tests build it
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via `SQLModel.metadata.create_all`. The **production migration is FE-owned (Drizzle ORM)** — a
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straight lift-and-shift of the columns below.
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## `property_baseline_performance` — one row per Property
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| Column | Type | Notes |
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|---|---|---|
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| `id` | serial PK | |
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| `property_id` | int, FK → `property.id`, **unique** | one Baseline Performance per Property |
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| `lodged_sap_score` | int | Lodged Performance — gov register, off the Effective EPC |
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| `lodged_epc_band` | text | the `Epc` enum, stored as its string value (e.g. `"C"`) |
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| `lodged_co2_emissions_t_per_yr` | float | tonnes CO₂/yr (whole dwelling) |
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| `lodged_primary_energy_intensity_kwh_per_m2_yr` | int | PEUI (kWh/m²/yr); **not** "heat demand" — see CONTEXT.md |
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| `effective_sap_score` | int | Effective Performance — what modelling scored against |
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| `effective_epc_band` | text | |
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| `effective_co2_emissions_t_per_yr` | float | tonnes CO₂/yr (whole dwelling) |
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| `effective_primary_energy_intensity_kwh_per_m2_yr` | int | kWh/m²/yr |
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| `rebaseline_reason` | text | `none` \| `pre_sap10` \| `physical_state_changed` \| `both` |
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| `space_heating_kwh` | float | EPC `renewable_heat_incentive` recorded demand. **Superseded** by `heating_kwh` (delivered) when the bill block populates; kept until then to avoid an empty-kWh gap, dropped in the population slice. |
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| `water_heating_kwh` | float | EPC `renewable_heat_incentive`; **superseded** by `hot_water_kwh`. |
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### Bill block (ADR-0014) — the energy bill, composed per section
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Produced by **Bill Derivation**: the calculator's **delivered** kWh per end use priced at current
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**Fuel Rates** (a committed snapshot, not SAP's standardised prices), per section + the total.
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Per-section kWh is *delivered fuel* (demand ÷ efficiency — what the household pays for), distinct
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from the recorded-demand `space_heating_kwh`/`water_heating_kwh` above which it supersedes.
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| Column | Type | Notes |
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|---|---|---|
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| `fuel_rates_period` | text | which Fuel Rates snapshot priced this bill (e.g. `"2026-04 to 2026-06"`) — provenance |
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| `heating_kwh` | float | delivered fuel kWh (main + secondary heating) |
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| `heating_cost_gbp` | float | priced at the heating fuel's current rate |
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| `hot_water_kwh` | float | |
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| `hot_water_cost_gbp` | float | |
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| `lighting_kwh` | float | |
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| `lighting_cost_gbp` | float | |
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| `appliances_kwh` | float | unregulated load — **0 until the appliances/cooking fields land on `SapResult`** (ADR-0014 TODO) |
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| `appliances_cost_gbp` | float | |
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| `cooking_kwh` | float | unregulated load — 0 until `SapResult` carries it |
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| `cooking_cost_gbp` | float | |
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| `pumps_fans_kwh` | float | |
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| `pumps_fans_cost_gbp` | float | |
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| `cooling_kwh` | float | mostly 0 in UK homes; carried for completeness as it affects the bill |
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| `cooling_cost_gbp` | float | |
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| `standing_charges_gbp` | float | daily standing charge × 365, once per distinct metered fuel (off-gas fuels have none) |
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| `seg_credit_gbp` | float | SEG export credit on PV (subtracted) |
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| `total_annual_bill_gbp` | float | Σ section costs + standing charges − SEG |
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The calculator is **load-bearing** (ADR-0013 amendment): for `sap_version < 10.2` the `effective_*`
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columns hold the calculator's output (so `effective_* != lodged_*` legitimately); at/above 10.2 they
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mirror the lodged figures and divergence is logged. A cert the calculator cannot score aborts the
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batch rather than persisting a wrong row.
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### Population timing
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The bill columns are **defined now so the FE can create them**, but are populated only once the
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`SapResult` → `EnergyBreakdown` adapter + `BillDerivation` wiring land (gated on the appliances /
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cooking `SapResult` fields). Until then the SQLModel mirror in `infrastructure/postgres/` adds these
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columns as nullable; the Drizzle migration can create them nullable in parallel.
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