ticket type rework

app/Models/TicketType.php

@@ -8,20 +8,19 @@ use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
-#[Fillable(['is_builtin', 'name', 'position', 'project_id', 'system_key'])]
+#[Fillable(['name', 'position', 'project_id', 'is_parent'])]
 class TicketType extends Model
 {
-    /**
-     * @var array<int, string>
-     */
-    public const BUILTIN_KEYS = [
-        'task',
-        'parent',
-    ];
-
     /** @use HasFactory<TicketTypeFactory> */
     use HasFactory;
 
+    protected function casts(): array
+    {
+        return [
+            'is_parent' => 'boolean',
+        ];
+    }
+
     public function project(): BelongsTo
     {
         return $this->belongsTo(Project::class);