fff3edab08
View derives is_sales_started (bool) via EXISTS subquery on domrf_kn_flats. Enables SiteFinder to separate pre-sale buildings (no flats listed yet) from active-sale ones. 75/1322 Строящиеся buildings in region 66 are pre-sale (5.7%).
44 lines
1.9 KiB
PL/PgSQL
44 lines
1.9 KiB
PL/PgSQL
-- 105_add_sales_started_flag.sql
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--
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-- Context: SF FixList #18 (Wave 3)
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-- Purpose: Expose is_sales_started flag on domrf_kn_objects so SiteFinder can
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-- distinguish "Строящиеся с открытыми продажами" from pre-sale buildings
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-- (those where domrf_kn_flats has no rows for that obj_id yet).
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--
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-- Design decision: VIEW instead of GENERATED ALWAYS AS column.
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-- - PostgreSQL GENERATED columns do not support subqueries (only immutable expressions).
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-- - A VIEW is idempotent (CREATE OR REPLACE), needs no backfill, and stays fresh.
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-- - Consumers query v_domrf_objects_with_sales in place of domrf_kn_objects where
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-- the flag is needed; the base table remains unchanged for scrapers / ON CONFLICT.
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--
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-- Audit (2026-05-17, region_cd=66, site_status='Строящиеся'):
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-- total_buildings: 1322
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-- with_flats (is_sales_started=TRUE): 1247 (94.3%)
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-- without_flats (pre-sale / no flats): 75 ( 5.7%)
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--
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-- Dependencies: domrf_kn_objects, domrf_kn_flats
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-- Deploy order: standalone, no existing deps to drop first
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-- Idempotent: yes (CREATE OR REPLACE VIEW)
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BEGIN;
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CREATE OR REPLACE VIEW v_domrf_objects_with_sales AS
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SELECT
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o.*,
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EXISTS (
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SELECT 1
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FROM domrf_kn_flats f
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WHERE f.obj_id = o.obj_id
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) AS is_sales_started
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FROM domrf_kn_objects o;
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COMMENT ON VIEW v_domrf_objects_with_sales IS
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'domrf_kn_objects + is_sales_started (bool). '
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'TRUE когда в domrf_kn_flats есть хотя бы одна запись для данного obj_id. '
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'Позволяет отличать строящиеся дома с открытыми продажами от pre-sale объектов.';
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COMMENT ON COLUMN v_domrf_objects_with_sales.is_sales_started IS
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'Derived: TRUE если EXISTS (SELECT 1 FROM domrf_kn_flats WHERE obj_id = o.obj_id). '
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'Pre-sale = FALSE (квартиры ещё не выложены на domrf.ru).';
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COMMIT;
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