# `baseline_performance` table — FE-owned migration

**Context:** Slice 6 (Hestia-Homes/Model#1135) of the `ara_first_run` rebuild. The
`BaselineOrchestrator` establishes a Property's **Baseline Performance** (ADR-0004) and persists it
via a new `BaselineRepository` port. This is a brand-new table — no predecessor.

Per ADR-0004's amendment, the lodged/effective pair does **not** land on `property_details_epc`
(which is being retired as too coupled to the legacy EPC-API schema). It lands here, as its own
aggregate's table.

The SQLModel row is defined in `infrastructure/postgres/` so the ephemeral-Postgres tests build it
via `SQLModel.metadata.create_all`. The **production migration is FE-owned (Drizzle ORM)** — a
straight lift-and-shift of the columns below.

## `baseline_performance` — one row per Property

| Column | Type | Notes |
|---|---|---|
| `id` | serial PK | |
| `property_id` | int, FK → `property.id`, **unique** | one Baseline Performance per Property |
| `lodged_sap_score` | int | Lodged Performance — gov register, off the Effective EPC |
| `lodged_epc_band` | text | the `Epc` enum, stored as its string value (e.g. `"C"`) |
| `lodged_co2_emissions` | float | |
| `lodged_primary_energy_intensity` | int | PEUI (kWh/m²/yr); **not** "heat demand" — see CONTEXT.md |
| `effective_sap_score` | int | Effective Performance — what modelling scored against |
| `effective_epc_band` | text | |
| `effective_co2_emissions` | float | |
| `effective_primary_energy_intensity` | int | |
| `rebaseline_reason` | text | `none` \| `pre_sap10` \| `physical_state_changed` \| `both` |
| `space_heating_kwh` | float | off `renewable_heat_incentive`; deterministic (ADR-0006) |
| `water_heating_kwh` | float | off `renewable_heat_incentive` |

This slice has no ML rebaselining, so `effective_* == lodged_*` and `rebaseline_reason = 'none'`
for every row written (a pre-SAP10 cert raises rather than persisting a wrong-but-plausible row —
see #1135). The `effective_*` columns exist now so the table shape is stable when ML lands.

## Deferred (follow-up — EPC Energy Derivation + Fuel Rates)

`fuel_split` and `bills` are **not** in this table yet. They are produced by
`EpcEnergyDerivationService`, which needs a current **Fuel Rates** source (Ofgem-cap ETL) that does
not exist yet. They land together in the follow-up so this table is not migrated twice. Likely
shape: a `bills`-style block (per-fuel kWh + standing charge + SEG) — to be specified in that
slice's migration note.