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: v72.go
    path of file: ./repos/gitea/models/migrations/v1_6
    
    the code of the file until where you have to start completion: // Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

pa
    
func AddReview(x *xorm.Engine) error {
	// Review see models/review.go
	type Review struct {
		ID          int64 `xorm:"pk autoincr"`
		Type        string
		ReviewerID  int64 `xorm:"index"`
		IssueID     int64 `xorm:"index"`
		Content     string
		CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
		UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
	}

	if err := x.Sync(new(Review)); err != nil {
		return fmt.Errorf("Sync: %w", err)
	}
	return nil
}