Add all files

app/Observers/ServiceUpgradeObserver.php

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+<?php
+
+namespace App\Observers;
+
+use App\Events\ServiceUpgrade as ServiceUpgradeEvent;
+use App\Models\ServiceUpgrade;
+
+class ServiceUpgradeObserver
+{
+    /**
+     * Handle the ServiceUpgrade "created" event.
+     */
+    public function created(ServiceUpgrade $serviceUpgrade): void
+    {
+        event(new ServiceUpgradeEvent\Created($serviceUpgrade));
+    }
+
+    /**
+     * Handle the ServiceUpgrade "updated" event.
+     */
+    public function updated(ServiceUpgrade $serviceUpgrade): void
+    {
+        event(new ServiceUpgradeEvent\Updated($serviceUpgrade));
+    }
+
+    /**
+     * Handle the ServiceUpgrade "deleted" event.
+     */
+    public function deleted(ServiceUpgrade $serviceUpgrade): void
+    {
+        event(new ServiceUpgradeEvent\Deleted($serviceUpgrade));
+    }
+}