ticket type rework

database/migrations/2026_03_25_003100_create_ticket_types_table.php

@@ -15,13 +15,11 @@ return new class extends Migration
             $table->id();
             $table->foreignId('project_id')->constrained()->cascadeOnDelete();
             $table->string('name');
-            $table->string('system_key')->nullable();
-            $table->boolean('is_builtin')->default(false);
+            $table->boolean('is_parent')->default(false);
             $table->unsignedInteger('position');
             $table->timestamps();
 
             $table->unique(['project_id', 'position']);
-            $table->unique(['project_id', 'system_key']);
         });
     }