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: v213.go
    path of file: ./repos/gitea/models/migrations/v1_17
    
    the code of the file until where you have to start completion: // Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package v1_17 //nolint

import (
	"x
    
func AddAllowMaintainerEdit(x *xorm.Engine) error {
	// PullRequest represents relation between pull request and repositories.
	type PullRequest struct {
		AllowMaintainerEdit bool `xorm:"NOT NULL DEFAULT false"`
	}

	return x.Sync(new(PullRequest))
}