테넌트 목록 조회 cursor기반으로 재구성. 사용자 metadata 미사용 필드 제거

backend/internal/repository/user_membership_maintenance.go

@@ -0,0 +1,56 @@
+package repository
+
+import (
+	"context"
+
+	"gorm.io/gorm"
+)
+
+func ClearOrphanUserTenantMemberships(ctx context.Context, db *gorm.DB) (int64, error) {
+	result := db.WithContext(ctx).Exec(`
+WITH orphan_users AS (
+	SELECT u.id
+	FROM users AS u
+	WHERE u.deleted_at IS NULL
+	  AND (
+		(
+			u.tenant_id IS NOT NULL
+			AND NOT EXISTS (
+				SELECT 1
+				FROM tenants AS t
+				WHERE t.id = u.tenant_id
+				  AND t.deleted_at IS NULL
+			)
+		)
+		OR (
+			NULLIF(BTRIM(u.company_code), '') IS NOT NULL
+			AND NOT EXISTS (
+				SELECT 1
+				FROM tenants AS t
+				WHERE LOWER(t.slug) = LOWER(BTRIM(u.company_code))
+				  AND t.deleted_at IS NULL
+			)
+		)
+		OR EXISTS (
+			SELECT 1
+			FROM UNNEST(COALESCE(u.company_codes, ARRAY[]::text[])) AS code(value)
+			WHERE NULLIF(BTRIM(code.value), '') IS NOT NULL
+			  AND NOT EXISTS (
+				SELECT 1
+				FROM tenants AS t
+				WHERE LOWER(t.slug) = LOWER(BTRIM(code.value))
+				  AND t.deleted_at IS NULL
+			  )
+		)
+	  )
+)
+UPDATE users AS u
+SET tenant_id = NULL,
+	company_code = '',
+	company_codes = NULL,
+	updated_at = NOW()
+FROM orphan_users AS ou
+WHERE u.id = ou.id
+`)
+	return result.RowsAffected, result.Error
+}