fix(tradein-sql): remove duplicate CREATE INDEX from 050 (regression from PR #500) (#515)

tradein-mvp/backend/data/sql/050_search_optimization.sql

@@ -77,18 +77,16 @@ CREATE INDEX IF NOT EXISTS listings_kadastr_idx
   ON listings (kadastr_num)
   WHERE kadastr_num IS NOT NULL;
 
--- 8) listing_sources (listing_id) — for source aggregation
-CREATE INDEX IF NOT EXISTS listing_sources_listing_idx2
-  ON listing_sources (listing_id);
+-- 8) listing_sources (listing_id) — REMOVED in PR 7
+--     duplicate of 028_matching_tables.sql's listing_sources_listing_idx.
 
 -- 9) listing_sources (listing_id, price_rub) — for price divergence detection
 CREATE INDEX IF NOT EXISTS listing_sources_price_divergence_idx2
   ON listing_sources (listing_id, price_rub)
   WHERE price_rub IS NOT NULL;
 
--- 10) houses GIST + fingerprint + kadastr (consolidated houses indexes)
-CREATE INDEX IF NOT EXISTS houses_geom_idx2
-  ON houses USING GIST (geom);
+-- 10) houses fingerprint + kadastr (consolidated houses indexes)
+--      Note: houses_geom_idx2 removed in PR 7 — duplicated 009_houses.sql's houses_geom_idx.
 CREATE INDEX IF NOT EXISTS houses_fingerprint_idx2
   ON houses (address_fingerprint)
   WHERE address_fingerprint IS NOT NULL;