40 lines
1.9 KiB
PL/PgSQL
40 lines
1.9 KiB
PL/PgSQL
-- 100_22j_dedup_infrastructure.sql
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-- Context: domrf_kn_infrastructure has ~496k rows but only ~229k unique by
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-- (obj_id, poi_category, poi_name, poi_address) — ~267k duplicates.
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-- Root cause: old scraper re-inserts same POIs on every run with new
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-- snapshot_date, and the old UNIQUE key includes snapshot_date so
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-- dedup was per-day only.
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-- Fix:
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-- 1. One-time cleanup: keep lowest ctid per dedup key, delete the rest.
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-- 2. Drop old UNIQUE constraint (includes snapshot_date — wrong granularity).
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-- 3. Add new UNIQUE (obj_id, poi_category, poi_name, poi_address)
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-- with NULLS NOT DISTINCT (PG16) so NULL values are treated as equal.
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-- Dependencies: none (no views reference this table by constraint name)
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-- Deploy order: apply this SQL first, then deploy backend with ON CONFLICT fix.
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-- Idempotent: yes — constraint uses IF NOT EXISTS equivalent via DO $$ block;
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-- DELETE is safe to re-run (no rows left to delete after first run).
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-- Issue: #297 / task 22j
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-- Applied: 2026-05-17
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BEGIN;
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-- Step 1: one-time dedup — keep min(ctid) per logical key
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DELETE FROM domrf_kn_infrastructure a
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USING domrf_kn_infrastructure b
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WHERE a.ctid > b.ctid
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AND a.obj_id = b.obj_id
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AND COALESCE(a.poi_category, '') = COALESCE(b.poi_category, '')
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AND COALESCE(a.poi_name, '') = COALESCE(b.poi_name, '')
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AND COALESCE(a.poi_address, '') = COALESCE(b.poi_address, '');
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-- Step 2: drop old unique constraint (wrong key — includes snapshot_date)
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ALTER TABLE domrf_kn_infrastructure
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DROP CONSTRAINT IF EXISTS domrf_kn_infrastructure_obj_id_poi_name_poi_lat_poi_lon_sna_key;
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-- Step 3: add new unique constraint with NULLS NOT DISTINCT (PG15+)
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-- so NULL poi_category / poi_address are treated as equal (not distinct)
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ALTER TABLE domrf_kn_infrastructure
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ADD CONSTRAINT uq_infra_dedupe
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UNIQUE NULLS NOT DISTINCT (obj_id, poi_category, poi_name, poi_address);
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COMMIT;
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