SilverStripe 4 - re-add member “LastVisited” date/time tracking

config.yml

---
Name: app
---
SilverStripe\Security\Member:
  extensions:
    - App\Extensions\MemberExtension
---
Name: app-middleware
After: '#coresecurity'
---
SilverStripe\Core\Injector\Injector:
  SilverStripe\Control\Director:
    properties:
      Middlewares:
        LastVisitedMiddleware: '%$App\Control\Middleware\LastVisitedMiddleware'

LastVisitedMiddleware.php

<?php

namespace App\Control\Middleware;

use SilverStripe\Control\HTTPRequest;
use SilverStripe\Control\Middleware\HTTPMiddleware;
use SilverStripe\ORM\DB;
use SilverStripe\Security\Security;

class LastVisitedMiddleware implements HTTPMiddleware
{
    public function process(HTTPRequest $request, callable $delegate)
    {
        $member = Security::getCurrentUser();
        if ($member) {
            DB::prepared_query(
                sprintf('UPDATE "Member" SET "LastVisited" = %s WHERE "ID" = ?', DB::get_conn()->now()),
                [$member->ID]
            );
        }

        return $delegate($request);
    }
}

MemberExtension.php

<?php

namespace App\Extensions;

use SilverStripe\Core\Extension;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\ReadonlyField;

class MemberExtension extends Extension
{
    private static $db = [
        'LastVisited' => 'Datetime'
    ];

    /**
     * @param FieldList $fields
     */
    public function updateCMSFields(FieldList $fields)
    {
        $fields->insertBefore(
            'Locale',
            ReadonlyField::create('LastVisited', 'Last Visited Date')
        );
    }
}