41 lines
1.4 KiB
SQL
41 lines
1.4 KiB
SQL
-- Migration: Enforce unique economic customer number on customers
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-- Prevents ambiguous mapping during e-conomic sync
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-- Normalize values before uniqueness check
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UPDATE customers
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SET economic_customer_number = NULL
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WHERE economic_customer_number IS NOT NULL
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AND btrim(economic_customer_number) = '';
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UPDATE customers
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SET economic_customer_number = btrim(economic_customer_number)
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WHERE economic_customer_number IS NOT NULL;
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-- Abort migration if duplicates exist (must be manually resolved first)
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DO $$
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DECLARE
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duplicate_value TEXT;
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duplicate_count INTEGER;
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BEGIN
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SELECT economic_customer_number, COUNT(*)::INTEGER
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INTO duplicate_value, duplicate_count
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FROM customers
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WHERE economic_customer_number IS NOT NULL
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GROUP BY economic_customer_number
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HAVING COUNT(*) > 1
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ORDER BY COUNT(*) DESC, economic_customer_number
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LIMIT 1;
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IF duplicate_value IS NOT NULL THEN
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RAISE EXCEPTION 'Cannot create unique index on customers.economic_customer_number. Duplicate value: % (count=%). Resolve duplicates and rerun migration.', duplicate_value, duplicate_count;
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END IF;
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END $$;
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-- Enforce uniqueness for non-null values
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CREATE UNIQUE INDEX IF NOT EXISTS customers_economic_customer_number_unique_idx
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ON customers (economic_customer_number)
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WHERE economic_customer_number IS NOT NULL;
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COMMENT ON INDEX customers_economic_customer_number_unique_idx IS
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'Ensures e-conomic customer numbers are unique to prevent sync mismatch.';
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