restore admin helper chain and stabilize seo routes

code/app/model/SeoExternalSnapshotModel.php

@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace app\model;
+
+class SeoExternalSnapshotModel extends BaseModel
+{
+    protected $name = 'seo_external_snapshot';
+    protected $pk = 'id';
+}