You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pkg.go
    path of file: ./repos/bk-cmdb/src/scene_server/admin_server/upgrader/y3.9.202104211151
    
    the code of the file until where you have to start completion: /*
 * Tencent is pleased to support the open source community by making 蓝鲸 available.
 * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
 * Licensed under the MIT License (the "License"); you may not use this file except
 * i
    
func upgrade(ctx context.Context, db dal.RDB, conf *upgrader.Config) (err error) {
	blog.Infof("start execute y3.9.202104211151，remove set name unique with biz index, and add set name unique with parent id index")

	err = changeSetUniqueIndex(ctx, db, conf)
	if err != nil {
		blog.Errorf("[upgrade y3.9.202104211151] change unique index failed, err: %v", err)
		return err
	}
	return nil
}