Model changelog

Every output is stamped model_version. When the version bumps, active listings scored under the old model get rescored (stale_model_rows in /api/health tracks the backlog). Releases that change numbers get an entry here.

p0a-2026.07 (current)

Comp-engine guards and honesty fixes, following a 2026-07-08 audit that found a live $500k Logan Square 2-flat valued at ARV $1.37M from comps spanning $125k–$1.94M:

Similarity floor 0.45 and a minimum of 4 comps — dissimilar sales are rejected with reasons, not averaged in.
Dispersion gate: comp IQR > 45% of median → “insufficient comps,” not a number.
Dispersion penalty in the confidence formula uncapped (was capped at 35); comps drive ARV only at confidence ≥ 55 (was 35).
Income-approach cap re-anchored to the tract heuristic — a hot comp base can no longer float its own ceiling.
Circular ARV fallback removed: tract price null → unscored with a reason, never (ask + rehab) × 1.12.
Unscored states: deal_score: null with reason strings; null ≠ 0.
Client/worker parity: the in-map calculator now runs the same math as the API (it had a leftover 1.30 comp premium, 1.85× rent multiplier, and 2× income cap).
Public beta: reads and /mcp opened, 30 calls/min/IP.

What changed for your numbers: addresses with mixed-condition comp sets now refuse instead of returning an inflated ARV; the map popup and the API can no longer disagree; some listings that previously had scores are now honestly null.

p0-2026.06

Economics factor (0.35–1.0) multiplicatively gates the deal score.
Income-approach ARV capped at 1.5× (was 2× — too loose).
Bedroom-aware market rents: SAFMR ladder blended with ZORI, bounded 0.7–1.6× SAFMR.
Renovated rent multiplier 1.85× → 1.5× in the engine.

What changed for your numbers: deal scores collapsed on bad deal math even in good tracts; rents and income-approach ARVs dropped to defensible levels. Scores broadly moved down — that was the point.