14 lines
575 B
MySQL
14 lines
575 B
MySQL
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-- Migration: Fix CVR Unique Constraint
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-- Allow multiple customers without CVR number (NULL or empty string)
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-- Drop old unique constraint
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ALTER TABLE customers DROP CONSTRAINT IF EXISTS customers_cvr_number_key;
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-- Create partial unique index - only enforce uniqueness for non-empty CVR numbers
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CREATE UNIQUE INDEX IF NOT EXISTS customers_cvr_number_unique_idx
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ON customers (cvr_number)
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WHERE cvr_number IS NOT NULL AND cvr_number != '';
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COMMENT ON INDEX customers_cvr_number_unique_idx IS
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'Ensures CVR numbers are unique, but allows multiple customers without CVR';
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