Clean up lots of models.

app/Models/ImportJob.php

@@ -27,6 +27,19 @@ use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 class ImportJob extends Model
 {
 
+    /**
+     * The attributes that should be casted to native types.
+     *
+     * @var array
+     */
+    protected $casts
+        = [
+            'created_at' => 'date',
+            'updated_at' => 'date',
+        ];
+    /** @var array */
+    protected $dates = ['created_at', 'updated_at'];
+
     protected $validStatus
         = [
             'import_status_never_started', // initial state