fix(tradein-sql): rename dup 030, add trade_in_estimates geom, drop dup indexes (#500)

Close 3 SQL schema findings from 2026-05-24 trade-in audit.

- Rename 030_listings_alter_yandex.sql -> 033_*.sql (resolve dup prefix with 030_avito_imv_cache_key_unique.sql).
- New 034_trade_in_estimates_geom.sql: PostGIS geom column + GIST index + backfill + BEFORE INSERT/UPDATE trigger.
- New 035_drop_duplicate_indexes.sql: drop listing_sources_listing_idx2 (dup of 028) and houses_geom_idx2 (dup of 009).

All idempotent. Deploy script uses ls|sort + no tracking table — rename is safe because original 030 already applied (IF NOT EXISTS no-op on re-run as 033).

tradein-mvp/backend/data/sql/031_houses_alter_yandex.sql

@@ -3,7 +3,7 @@
 -- Dependencies:
 --   - houses table: 009_houses.sql
 --   - 020_houses_alter_cian.sql (prior Cian columns must exist; no FK dependency, column-level only)
--- Deploy order: Apply after 030_listings_alter_yandex.sql
+-- Deploy order: Apply after 033_listings_alter_yandex.sql (renamed from duplicate-prefix 030 in PR feat/sql-rename-030-and-schema-debt)
 --
 -- Sources:
 --   - decisions/Schema_YandexRealty_Recon.md sec 11.2 (Newbuilding ЖК landing fields)

tradein-mvp/backend/data/sql/033_listings_alter_yandex.sql

@@ -1,4 +1,4 @@
--- 030_listings_alter_yandex.sql
+-- 033_listings_alter_yandex.sql
 -- Purpose: Add Yandex Realty-specific columns to listings table (SERP + detail fields).
 -- Dependencies: listings table created in 002_core_tables.sql / 011_listings_alter.sql
 --               019_listings_alter_cian.sql already adds views_total (int) for Cian.

tradein-mvp/backend/data/sql/034_trade_in_estimates_geom.sql

@@ -0,0 +1,45 @@
+-- 034_trade_in_estimates_geom.sql
+-- Purpose: schema-consistency debt — add PostGIS geom column + GIST index + trigger
+--          to trade_in_estimates (table currently has lat/lon but no geom).
+-- Dependencies: 001_trade_in_estimates.sql (table must exist)
+-- Deploy order: any time after 001.
+--
+-- Why: rule `.claude/rules/sql.md` — any table with lat/lon should have geom + GIST
+--      for future spatial queries. Currently estimator does not query trade_in_estimates
+--      spatially, but views/audits will. Trigger keeps geom in sync with lat/lon writes.
+--
+-- Idempotent: ADD COLUMN/INDEX IF NOT EXISTS; CREATE OR REPLACE FUNCTION; DROP+CREATE TRIGGER.
+
+BEGIN;
+
+ALTER TABLE trade_in_estimates
+  ADD COLUMN IF NOT EXISTS geom geometry(Point, 4326);
+
+-- Backfill from existing lat/lon (idempotent — only rows where geom is currently NULL).
+UPDATE trade_in_estimates
+SET geom = ST_SetSRID(ST_MakePoint(lon, lat), 4326)
+WHERE geom IS NULL
+  AND lat IS NOT NULL
+  AND lon IS NOT NULL;
+
+CREATE INDEX IF NOT EXISTS trade_in_estimates_geom_idx
+  ON trade_in_estimates USING GIST (geom);
+
+CREATE OR REPLACE FUNCTION trade_in_estimates_set_geom()
+RETURNS trigger AS $$
+BEGIN
+  IF NEW.lat IS NOT NULL AND NEW.lon IS NOT NULL THEN
+    NEW.geom := ST_SetSRID(ST_MakePoint(NEW.lon, NEW.lat), 4326);
+  ELSE
+    NEW.geom := NULL;
+  END IF;
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS trade_in_estimates_set_geom_trg ON trade_in_estimates;
+CREATE TRIGGER trade_in_estimates_set_geom_trg
+  BEFORE INSERT OR UPDATE OF lat, lon ON trade_in_estimates
+  FOR EACH ROW EXECUTE FUNCTION trade_in_estimates_set_geom();
+
+COMMIT;

tradein-mvp/backend/data/sql/035_drop_duplicate_indexes.sql

@@ -0,0 +1,20 @@
+-- 035_drop_duplicate_indexes.sql
+-- Purpose: cleanup of redundant indexes identified in 2026-05-24 schema audit.
+-- Dependencies: 028 (listing_sources_listing_idx), 050 (listing_sources_listing_idx2, houses_geom_idx2), 009 (houses_geom_idx).
+-- Deploy order: any time after 050.
+--
+-- Redundancy details:
+--   * listing_sources_listing_idx2 (050) — exact duplicate of listing_sources_listing_idx (028).
+--   * houses_geom_idx2 (050) — near-duplicate of houses_geom_idx (009); both are GIST on geom (full, non-partial).
+--     The (050) variant adds no filter, so it's strictly redundant.
+--
+-- Keep: listing_sources_listing_idx (028), houses_geom_idx (009).
+--
+-- Idempotent: DROP INDEX IF EXISTS.
+
+BEGIN;
+
+DROP INDEX IF EXISTS listing_sources_listing_idx2;
+DROP INDEX IF EXISTS houses_geom_idx2;
+
+COMMIT;