27 lines
904 B
MySQL
27 lines
904 B
MySQL
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-- Migration 185: Prevent duplicate active location-contact relations
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-- Date: 2026-05-05
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-- Purpose: Ensure one active relation per (location_id, related_contact_id)
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-- Soft-delete duplicate active rows, keep best candidate (primary first, then oldest)
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WITH ranked AS (
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SELECT
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id,
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ROW_NUMBER() OVER (
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PARTITION BY location_id, related_contact_id
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ORDER BY is_primary DESC, created_at ASC, id ASC
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) AS rn
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FROM locations_contacts
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WHERE deleted_at IS NULL
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AND related_contact_id IS NOT NULL
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)
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UPDATE locations_contacts lc
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SET deleted_at = NOW()
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FROM ranked r
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WHERE lc.id = r.id
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AND r.rn > 1;
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-- Enforce uniqueness for active linked contacts
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CREATE UNIQUE INDEX IF NOT EXISTS uq_locations_contacts_location_related_active
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ON locations_contacts(location_id, related_contact_id)
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WHERE deleted_at IS NULL AND related_contact_id IS NOT NULL;
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