Move the model callbacks into Observables; reduce caching since it held balances incorrectly

app/Models/Observers/PirepFieldObserver.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Models\Observers;
+
+use App\Models\PirepField;
+
+/**
+ * Class PirepFieldObserver
+ * @package App\Models\Observers
+ */
+class PirepFieldObserver
+{
+    /**
+     * @param PirepField $model
+     */
+    public function creating(PirepField $model): void
+    {
+        $model->slug = str_slug($model->name);
+    }
+
+    /**
+     * @param PirepField $model
+     */
+    public function updating(PirepField $model): void
+    {
+        $model->slug = str_slug($model->name);
+    }
+}