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

app/Models/ProductService.php

@@ -6,11 +6,23 @@ use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
+use App\Enums\ServiceType;
+use App\Enums\ContractStatus;
+
 #[Fillable(['product_id', 'service_type', 'status', 'actual_collection_date', 'remark'])]
 class ProductService extends Model
 {
     protected $table = 'product_services';
 
+    protected function casts(): array
+    {
+        return [
+            'service_type' => ServiceType::class,
+            'status' => ContractStatus::class,
+            'actual_collection_date' => 'date',
+        ];
+    }
+
     public function product(): BelongsTo
     {
         return $this->belongsTo(Product::class);