Refactor: Enforce type safety, fix close deadlock, implement assignee restrictions and notify admin fallbacks

app/Models/Handover.php

@@ -6,9 +6,18 @@ use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
+use App\Enums\HandoverStatus;
+
 #[Fillable(['product_id', 'customer_id', 'handover_date', 'status', 'remark'])]
 class Handover extends Model
 {
+    protected function casts(): array
+    {
+        return [
+            'status' => HandoverStatus::class,
+            'handover_date' => 'date',
+        ];
+    }
     public function product(): BelongsTo
     {
         return $this->belongsTo(Product::class);