Played around with a new app structure

app/Activity/Models/Viewable.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace BookStack\Activity\Models;
+
+use Illuminate\Database\Eloquent\Relations\MorphMany;
+
+interface Viewable
+{
+    /**
+     * Get all view instances for this viewable model.
+     */
+    public function views(): MorphMany;
+}