fix(audit): index for flats_latest, coerce max_height_m, hide empty reg-date (#1953)

Three #1953 audit follow-ups:

- perf: add migration 174 — composite index idx_kn_flats_obj_snap on
  domrf_kn_flats (obj_id, snapshot_date DESC). Serves the #1956 flats_latest
  CTE in best_layouts.py (DISTINCT ON (obj_id) ORDER BY obj_id, snapshot_date
  DESC + self-join on (obj_id, snapshot_date)); previously only (obj_id)
  existed so Postgres sorted per object. Prod: 789 569 rows, idx ~5.7 MB,
  dry-run instant. Idempotent, self-wrapped BEGIN/COMMIT.

- frontend: route every max_height_m read through coerceFloat (same string-bug
  class as max_far #1962). max_height_m is NUMERIC → arrives as a string on the
  wire; ptica-adapt.ts read it raw at 4 sites and relied on formatInt/Math.round
  coercion. Widen the type in nspd.ts and fix the stale "real number" comment in
  nspd-regulation.ts.

- frontend: hide the «Дата регистрации» EGRN row entirely when
  registration_date is null (~97% of parcels) instead of rendering a bare «—».

data/sql/174_domrf_kn_flats_obj_snapshot_idx.sql

@@ -0,0 +1,35 @@
+-- 174_domrf_kn_flats_obj_snapshot_idx.sql
+--
+-- Composite index on domrf_kn_flats (obj_id, snapshot_date DESC).
+--
+-- Serves the `flats_latest` CTE in best_layouts.py (#1956 supply batch query,
+-- backend/app/services/site_finder/best_layouts.py:_SUPPLY_BATCH_SQL):
+--
+--     flats_latest AS (
+--         SELECT DISTINCT ON (f.obj_id) f.obj_id, f.snapshot_date
+--         FROM domrf_kn_flats f
+--         JOIN nearby n ON n.obj_id = f.obj_id
+--         ORDER BY f.obj_id, f.snapshot_date DESC, f.id DESC
+--     )
+--     ... JOIN domrf_kn_flats f ON f.obj_id = fl.obj_id
+--                              AND f.snapshot_date = fl.snapshot_date
+--
+-- domrf_kn_flats is a per-object time-series (UNIQUE (obj_id, snapshot_date));
+-- the DISTINCT ON + ORDER BY obj_id, snapshot_date DESC picks each object's
+-- newest snapshot, and the self-join re-fetches that snapshot's rows by
+-- (obj_id, snapshot_date). The only existing index covering obj_id is
+-- idx_kn_flats_obj (obj_id) alone, so Postgres sorts per object on
+-- snapshot_date instead of reading it pre-ordered. A composite
+-- (obj_id, snapshot_date DESC) lets DISTINCT ON walk the index and lets the
+-- join probe by (obj_id, snapshot_date) directly.
+--
+-- Prod (2026-06-28): domrf_kn_flats = 789 569 rows; no (obj_id, snapshot_date)
+-- index present. DRY-RUN (BEGIN; CREATE INDEX; ROLLBACK) succeeded — index size
+-- ~5.7 MB, builds instantly. Idempotent: IF NOT EXISTS.
+
+BEGIN;
+
+CREATE INDEX IF NOT EXISTS idx_kn_flats_obj_snap
+    ON domrf_kn_flats (obj_id, snapshot_date DESC);
+
+COMMIT;

frontend/src/components/site-finder/analysis/EgrnPropertyTable.tsx

@@ -1,5 +1,6 @@
 /**
- * EgrnPropertyTable — 2-column key-value table of 10 EGRN properties.
+ * EgrnPropertyTable — 2-column key-value table of EGRN properties (the
+ * "Дата регистрации" row is hidden when registration_date is null — #1953).
  * Server component (no "use client") — pure display.
  * monospace for cad_num and area_m2.
  */
@@ -24,7 +25,7 @@ function formatDate(raw: string | null): string {
 }
 
 function buildRows(data: ParcelEgrn): Row[] {
-  return [
+  const rows: Row[] = [
     { label: "Кадастровый номер", value: data.cad_num, mono: true },
     { label: "Адрес", value: data.address },
     {
@@ -37,15 +38,25 @@ function buildRows(data: ParcelEgrn): Row[] {
     },
     { label: "ВРИ", value: data.vri },
     { label: "Категория", value: data.category },
-    {
+  ];
+
+  // registration_date is null for ~97% of parcels (#1953 audit) — hide the row
+  // entirely rather than render a bare "—".
+  if (data.registration_date) {
+    rows.push({
       label: "Дата регистрации",
       value: formatDate(data.registration_date),
-    },
+    });
+  }
+
+  rows.push(
     { label: "Форма собственности", value: data.owner_type },
     { label: "Обременения", value: data.encumbrance },
     { label: "Статус", value: data.status },
     { label: "Обновлено", value: formatDate(data.last_updated) },
-  ];
+  );
+
+  return rows;
 }
 
 export function EgrnPropertyTable({ data }: Props) {

frontend/src/components/site-finder/analysis/nspd-regulation.ts

@@ -13,10 +13,10 @@ import type { NspdZoning } from "@/types/nspd";
 
 /**
  * Coerce a wire value to a finite float. The ekb-geoportal-urbancard regulation
- * columns arrive as STRINGS ("2.4", "80") in `nspd_zoning.max_far` /
+ * columns are NUMERIC, so they arrive as STRINGS ("2.4", "12", "80") in
- * `max_building_pct`, but `max_floors` / `max_height_m` are real numbers — this
+ * `nspd_zoning.max_far` / `max_height_m` / `max_building_pct` — this accepts
- * accepts both and rejects null / "" / non-numeric so callers never do `NaN`
+ * both string and number and rejects null / "" / non-numeric so callers never
- * arithmetic. The single coercion point for #1962 + the cockpit.
+ * do `NaN` arithmetic. The single coercion point for #1962 + the cockpit.
  */
 export function coerceFloat(
   v: string | number | null | undefined,

frontend/src/components/site-finder/ptica/ptica-adapt.ts

@@ -414,9 +414,10 @@ function utilityLabel(subtype: string): string {
 export function adaptUrbanCard(a: ParcelAnalysis): PticaScanCard {
   const z = a.nspd_zoning;
   const zone = regulationZone(z);
-  // max_far / max_building_pct arrive as strings on the wire — coerce to numbers.
+  // max_far / max_height_m / max_building_pct are NUMERIC → strings on the wire;
+  // coerce to numbers.
   const maxFar = coerceFloat(z?.max_far);
-  const maxHeight = z?.max_height_m;
+  const maxHeight = coerceFloat(z?.max_height_m);
   const buildingPct = coerceFloat(z?.max_building_pct);
   const areaM2 = parcelAreaM2(a);
 
@@ -960,7 +961,7 @@ export function adaptUrbanDrawer(a: ParcelAnalysis): PticaUrbanDrawer {
     : notReal(SRC_NSPD_ZONING);
 
   const maxFar = coerceFloat(zoning?.max_far);
-  const maxHeight = zoning?.max_height_m;
+  const maxHeight = coerceFloat(zoning?.max_height_m);
   const buildingPct = coerceFloat(zoning?.max_building_pct);
   const areaM2 = parcelAreaM2(a);
   const regSource = zoning?.regulation_source;
@@ -1663,7 +1664,7 @@ export function adaptPotentialDrawer(a: ParcelAnalysis): PticaPotentialDrawer {
   const maxFar = coerceFloat(z?.max_far);
   const farReal = maxFar != null;
   const buildingPct = coerceFloat(z?.max_building_pct);
-  const maxHeight = z?.max_height_m;
+  const maxHeight = coerceFloat(z?.max_height_m);
   const maxFloors = z?.max_floors;
 
   // КСИТ ёмкость (надземная GFA) = площадь × max_far — real with both inputs.
@@ -2001,7 +2002,7 @@ export function adaptPotentialCard(a: ParcelAnalysis): PticaPotentialCard {
   const areaM2 = parcelAreaM2(a);
   const z = a.nspd_zoning;
   const maxFar = coerceFloat(z?.max_far);
-  const maxHeight = z?.max_height_m;
+  const maxHeight = coerceFloat(z?.max_height_m);
   const buildingPct = coerceFloat(z?.max_building_pct);
 
   const areaMetric: PticaPotentialMetric =

frontend/src/types/nspd.ts

@@ -9,11 +9,12 @@ export interface NspdZoning {
   raw_props?: Record<string, unknown>;
   // Real ПЗЗ regulation (PR #1847, synth #1891) — optional + nullable so the
   // cockpit stays backward-compatible until the field flows, then auto-lights-up.
-  // NB: max_far / max_building_pct arrive on the wire as STRINGS ("2.4", "80")
+  // NB: max_far / max_height_m / max_building_pct are NUMERIC columns, so they
-  // from the ekb-geoportal-urbancard regulation columns — typed `string | number`
+  // arrive on the wire as STRINGS ("2.4", "12", "80") from the
-  // so consumers must coerce (see coerceFloat in nspd-regulation.ts) before maths.
+  // ekb-geoportal-urbancard regulation columns — typed `string | number` so
+  // consumers must coerce (see coerceFloat in nspd-regulation.ts) before maths.
   max_far?: string | number | null; // КСИТ (предельный коэф. плотности застройки)
-  max_height_m?: number | null; // предельная высота, м
+  max_height_m?: string | number | null; // предельная высота, м
   max_floors?: number | null; // предельная этажность
   max_building_pct?: string | number | null; // коэф. застройки (процент пятна)
   min_parcel_area_m2?: number | null; // мин. площадь участка, м²