function wc_update_260_refunds() {
	global $wpdb;
	/**
	 * Refund item qty should be negative.
	 */
	$wpdb->query(
		"UPDATE {$wpdb->prefix}woocommerce_order_itemmeta as item_meta
		LEFT JOIN {$wpdb->prefix}woocommerce_order_items as items ON item_meta.order_item_id = items.order_item_id
		LEFT JOIN {$wpdb->posts} as posts ON items.order_id = posts.ID
		SET item_meta.meta_value = item_meta.meta_value * -1
		WHERE item_meta.meta_value > 0 AND item_meta.meta_key = '_qty' AND posts.post_type = 'shop_order_refund'"
	);
}