-- 반복 마이그레이션 실행으로 생긴 동일 위치·상위·라벨·URL 메뉴 중복 정리
WITH ranked_navigation AS (
  SELECT
    id,
    row_number() OVER (
      PARTITION BY location, COALESCE(parent_id::text, ''), label, url
      ORDER BY
        CASE WHEN is_folder THEN 0 ELSE 1 END,
        sort_order ASC,
        created_at ASC,
        id ASC
    ) AS row_rank
  FROM navigation_items
)
DELETE FROM navigation_items
WHERE id IN (
  SELECT id
  FROM ranked_navigation
  WHERE row_rank > 1
);

CREATE UNIQUE INDEX IF NOT EXISTS navigation_items_location_parent_label_url_unique_idx
  ON navigation_items (location, COALESCE(parent_id::text, ''), label, url);