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: migration.go
    path of file: ./repos/photoprism/internal/migrate
    
    the code of the file until where you have to start completion: package migrate

import (
	"fmt"
	"time"

	"github.com/jinzhu/gorm"
)

// Migration represents a database schema migration.
type Migration struc
    
func (m *Migration) Execute(db *gorm.DB) error {
	if db == nil {
		return fmt.Errorf("db is nil")
	}

	for _, s := range m.Statements { //  ADD
		if err := db.Exec(s).Error; err != nil {
			// Log the errors triggered by ALTER and DROP statements
			// and otherwise ignore them, since some databases do not
			// support "IF EXISTS".
			if IgnoreErr.Matches(s, err.Error()) {
				log.Tracef("migrate: ignored %s", err)
			} else {
				return err
			}
		}
	}

	return nil
}