# Autonomous corpus run — findings for review (2026-06-16)

Triaged the full remaining worklist (~95 UPRNs): capture → map → engine SAP,
flagging |eng−lodged| ≥ 8. Most certs map within ±4 of lodged.

## ✅ Schema coverage ADDED this run (low-risk, tested, committed)
- **SAP-18.0.0** → full-SAP shape, dispatched to `from_sap_schema_17_1` (no
  normalisation). Maps fine (e.g. 10094601287 → 80/lodged 84).
- **SAP-16.0** → same reduced-field 16.x path; only omitted `tenure`, now
  defaulted in `_normalize_sap_schema_16_x`. Maps (100020933894 → 61/lodged 56).
- (16.2/16.3/17.0 were added earlier in the session.)

## ⛔ Genuinely SPARSE 16.x certs (insufficient data — cannot score)
Missing 18 required fields incl. core fabric (glazed_area, window, door_count,
habitable_room_count, multiple_glazing_type). Fail loud at from_dict (correct):
- uprn_10090844948 (16.3), uprn_10014314798 (16.2), uprn_10014314853 (16.3),
  uprn_10014314830 (16.2). These are minimal "reduced-data" lodgements.

## 🐞 BUGS FOUND (diagnosed; NOT fixed — for your review)

### 1. Opening dimensions in millimetres read as metres — MAPPER bug (SEVERE)
Full-SAP certs whose `sap_building_parts[].sap_openings[]` lodge width/height in
**mm** (mixed with metre rows in the same array) → the 17.1 mapper treats all as
metres → multi-million-m² windows → HTC in the millions → **SAP clamps to 1**.
- **uprn_10093117227** (eng 1 / lodged 80): opening "Side Elevation" 2025×2100 (mm)
- **uprn_10090317693** (eng 1 / lodged 88): 940×2100, 700×1500 (mm)
- **uprn_10091636031** (eng 1 / lodged 85)
- Fix idea: sanitise `sap_openings` dims in `_sap_17_1_windows`/doors — any
  dimension > ~50 m is impossible → it's mm, ÷1000. Cleanly separates the mm rows
  (1000/2025/2100) from the m rows (3.06/3.6/1). Safe, high-value (3+ certs broken).

### 2. Heat-pump fuel code 39 mis-priced as gas — CALCULATOR bug
- **uprn_10093114053** (eng 93 / lodged 79, +14): PCDB heat pump COP 3.33, fuel 39.
- Code 39 absent from `table_12.UNIT_PRICE_P_PER_KWH` → gas default 3.64p; CO2
  factor correctly electricity (0.136). Inconsistent across price vs Table-12a.
- Affects ALL database heat-pump certs (fuel 39). See memory
  `heat-pump-fuel-39-mispriced`. Needs SAP-domain confirmation of the correct
  electricity tariff (standard 30 vs heat-pump) → not an autonomous fix.

## ⚠ MODERATE eng-vs-lodged gaps (not catastrophic — sample, for review)
Direction is mostly engine UNDER lodged on full-SAP (17.0/17.1) certs:
- −15: uprn_100090108846 (RdSAP-20, off-peak fuel 29), uprn_100061086424 (RdSAP-17.0)
- −12: uprn_10090343767 (17.0)   ·  −9: uprn_10090341811, 10093386427  ·  +9: uprn_10090342180
- A spread of −6…−8 on 17.0/17.1. Likely a mix of the full-SAP→RdSAP residual and
  possibly more heat-pump-fuel cases. Worth a focused pass after the 2 bugs above.

## NOT diagnosed individually
The ~70 within-±4 certs are not listed; they look healthy.