-- 095_dead_schema.sql
-- Purpose: Удаление мёртвой схемы (верифицированный безопасный подмножество аудита TradeinDb_Audit_May30).
--
-- Контекст (Issue #731):
--   sale_type_text: столбец 100% NULL в listings, code refs удалены в том же PR.
--   audit_log: 0 строк, 0 python refs, триггеры не зависят (верифицировано).
--
-- ⚠️ View-зависимость (фикс после падения деплоя 2026-05-31):
--   v_data_quality (recreated в 094) содержит CTE `SELECT * FROM listings`, что
--   фиксирует column-level зависимость на ВСЕ колонки listings, включая
--   sale_type_text — поэтому `DROP COLUMN sale_type_text` падал
--   ("cannot drop ... other objects depend on it"). Решение: drop view →
--   drop column → recreate view ТЕМ ЖЕ DDL (после дропа колонки `SELECT *`
--   её просто не включит). Проверено: только v_data_quality делает SELECT *
--   из listings; listings_search_mv / v_price_divergence берут явные колонки.
--
-- Idempotency:
--   DROP VIEW / DROP COLUMN IF EXISTS / DROP TABLE IF EXISTS / CREATE OR REPLACE —
--   безопасны при повторном запуске.
--
-- Явно НЕ удаляем: houses_price_dynamics, agents, sellers, estimate_photos,
--                  house_reviews, listings_snapshots.

BEGIN;

-- #731: drop dead schema (verified-safe subset of TradeinDb_Audit_May30)

-- v_data_quality зависит от listings.sale_type_text через `SELECT * FROM listings`
-- (см. 094). Дропаем view перед дропом колонки, пересоздаём ниже тем же DDL.
DROP VIEW IF EXISTS v_data_quality;

-- sale_type_text: 100% NULL in listings, code refs removed in same PR (#731)
ALTER TABLE IF EXISTS listings DROP COLUMN IF EXISTS sale_type_text;

-- Recreate v_data_quality (DDL идентичен 094 — sale_type_text не в выводе, только
-- неявно через SELECT * CTE; после дропа колонки * её не включает).
CREATE OR REPLACE VIEW v_data_quality AS
WITH active_listings AS (
    SELECT * FROM listings WHERE is_active = true
)
SELECT
    (SELECT count(*) FROM houses)                                                  AS houses_total,
    (SELECT count(*) FROM houses h
       WHERE EXISTS (SELECT 1 FROM house_sources hs WHERE hs.house_id = h.id))      AS houses_with_source,
    (SELECT count(*) FROM houses h
       WHERE EXISTS (SELECT 1 FROM house_sources hs
                      WHERE hs.house_id = h.id AND hs.ext_source = 'avito'))        AS houses_with_avito,
    (SELECT count(*) FROM houses h
       WHERE EXISTS (SELECT 1 FROM house_sources hs
                      WHERE hs.house_id = h.id AND hs.ext_source LIKE 'cian%'))     AS houses_with_cian,
    (SELECT count(*) FROM houses h
       WHERE EXISTS (SELECT 1 FROM house_sources hs
                      WHERE hs.house_id = h.id AND hs.ext_source = 'yandex'))       AS houses_with_yandex,
    (SELECT count(*) FROM (
        SELECT house_id FROM house_sources GROUP BY house_id HAVING count(*) >= 2
    ) sub)                                                                          AS houses_2plus_sources,
    (SELECT count(*) FROM (
        SELECT house_id FROM house_sources GROUP BY house_id HAVING count(*) >= 3
    ) sub)                                                                          AS houses_3plus_sources,
    (SELECT count(*) FROM active_listings)                                         AS listings_active,
    (SELECT count(*) FROM (
        SELECT listing_id FROM listing_sources
         WHERE listing_id IN (SELECT id FROM active_listings)
         GROUP BY listing_id HAVING count(*) >= 2
    ) sub)                                                                          AS listings_dedup_2sources,
    (SELECT count(*) FROM active_listings WHERE lat IS NOT NULL) * 100.0
        / NULLIF((SELECT count(*) FROM active_listings), 0)                         AS pct_geocoded,
    (SELECT count(*) FROM active_listings WHERE cadastral_number IS NOT NULL) * 100.0
        / NULLIF((SELECT count(*) FROM active_listings), 0)                         AS pct_cadastr,
    (SELECT count(*) FROM active_listings WHERE description IS NOT NULL) * 100.0
        / NULLIF((SELECT count(*) FROM active_listings), 0)                         AS pct_description,
    (SELECT count(*) FROM active_listings l
       JOIN houses h ON h.id = l.house_id_fk
       WHERE h.year_built IS NOT NULL) * 100.0
        / NULLIF((SELECT count(*) FROM active_listings), 0)                         AS pct_year_built,
    NOW() - (SELECT max(scraped_at) FROM listings WHERE source = 'avito')           AS avito_last_scrape_ago,
    NOW() - (SELECT max(scraped_at) FROM listings WHERE source = 'cian')            AS cian_last_scrape_ago,
    NOW() - (SELECT max(scraped_at) FROM listings WHERE source = 'yandex')          AS yandex_last_scrape_ago,
    (SELECT count(*) FROM v_price_divergence)                                       AS price_disagreements_count,
    (SELECT count(*) FROM listings WHERE is_outlier = true)                         AS outliers_flagged;

COMMENT ON VIEW v_data_quality IS
  'KPI snapshot. Refreshed on-demand by /api/v1/admin/data-quality endpoint (Master Plan sec 8.1).';

-- audit_log: 0 rows, 0 python refs, no triggers depend on it (verified)
DROP TABLE IF EXISTS audit_log;

COMMIT;