feat(market): revoke gendesign_reader direct SELECT on raw tables (#2138 step 3/3)

tradein-mvp/backend/data/sql/156_revoke_raw_from_reader.sql

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+-- 156_revoke_raw_from_reader.sql
+-- Revoke gendesign_reader direct SELECT on the 5 raw producer tables (#2138, step 3/3 — FINAL).
+--
+-- Context / gate:
+--   #2138 moves the external cross-load ETL consumer (#976 newbuilding_crossload.py) off the
+--   raw producer tables and onto the stable market.v_* contract views:
+--     step 1/3 (155) — GRANT SELECT on market.v_* to gendesign_reader (additive).
+--     step 2/3 (merged + run on prod: 8224 rows, 0 errors) — ETL now reads
+--             market.v_houses + market.v_house_sources via the views, no raw reads left.
+--     step 3/3 (this file) — REVOKE the raw-table SELECT grants from 101, so the reader
+--             sees ONLY the contract, not the kitchen.
+--
+--   Raw grants being revoked were issued by 101_gendesign_reader_role.sql:
+--     houses, house_sources, houses_price_dynamics, house_reliability_checks, house_reviews.
+--
+-- Scope (INTENTIONALLY narrow):
+--   - REVOKE only the 5 raw producer tables above.
+--   - listings + offer_price_history (granted by 102 for Site Finder #1191) are NOT touched —
+--     they are a separate consumer contract, still in active use.
+--   - market.v_* grants (155), schema market USAGE, yandex_jk_enrichment — NOT touched.
+--   - USAGE ON SCHEMA public is kept: reader still needs it and it does not expose table data
+--     on its own (market lives in a separate schema; SELECT is what gates the raw rows).
+--
+-- Dependencies:
+--   - 101_gendesign_reader_role.sql (grants being revoked)
+--   - 155_reader_grants_to_contract_views.sql (view grants the reader now relies on)
+--
+-- Idempotent: REVOKE is repeatable — re-running when the grant is already gone is a no-op,
+--   never an error. Role existence checked fail-fast below for a clear message.
+-- AUTO-APPLIED on prod via deploy-tradein.yml/_schema_migrations (strict).
+
+BEGIN;
+
+-- Fail-fast: role must exist (101 runs earlier by NN — guaranteed ok).
+DO $$
+BEGIN
+  IF NOT EXISTS (SELECT 1 FROM pg_roles WHERE rolname = 'gendesign_reader') THEN
+    RAISE EXCEPTION 'роль gendesign_reader отсутствует — сначала примените 101_gendesign_reader_role.sql';
+  END IF;
+END$$;
+
+-- Reader now reads exclusively via market.v_* contract views — drop raw-table access.
+REVOKE SELECT ON
+    houses,
+    house_sources,
+    houses_price_dynamics,
+    house_reliability_checks,
+    house_reviews
+FROM gendesign_reader;
+
+COMMIT;