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: module.go
    path of file: ./repos/portmaster/profile
    
    the code of the file until where you have to start completion: package profile

import (
	"errors"
	"fmt"
	"os"

	"github.com/safing/portbase/database"
	"github.com/safing/portbase/database/migration"
	"github.com/safing/portbase/dataroot"
	"github.com/safing/portbase/log"
	"github.com/safing/portbase/modules"
	_ "github.com/safing/portmaster/core/base"
	"github.com/safing/portmaster/profile/binmeta"
	"github.com/safing/portmaster/updates"
)

var (
	migrations  = migration.New("core:migrations/profile")
	module      *modules.Module
	updatesPath string
)

// Events.
const (
	ConfigChangeEvent = "profile co
    
func start() error {
	updatesPath = updates.RootPath()
	if updatesPath != "" {
		updatesPath += string(os.PathSeparator)
	}

	if err := loadProfilesMetadata(); err != nil {
		if !errors.Is(err, database.ErrNotFound) {
			log.Warningf("profile: failed to load profiles metadata, falling back to empty state: %s", err)
		}
		meta = &ProfilesMetadata{}
	}
	meta.check()

	if err := migrations.Migrate(module.Ctx); err != nil {
		log.Errorf("profile: migrations failed: %s", err)
	}

	err := registerValidationDBHook()
	if err != nil {
		return err
	}

	err = registerRevisionProvider()
	if err != nil {
		return err
	}

	err = startProfileUpdateChecker()
	if err != nil {
		return err
	}

	module.StartServiceWorker("clean active profiles", 0, cleanActiveProfiles)

	err = updateGlobalConfigProfile(module.Ctx, nil)
	if err != nil {
		log.Warningf("profile: error during loading global profile from configuration: %s", err)
	}

	if err := registerAPIEndpoints(); err != nil {
		return err
	}

	return nil
}