fix draft only created for user who creates them

be/database/migrations/2025_12_15_100000_add_draft_data_to_subtasks_table.php

@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('sub_tasks', function (Blueprint $table) {
+            $table->json('draft_data')->nullable()->after('is_draft');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('sub_tasks', function (Blueprint $table) {
+            $table->dropColumn('draft_data');
+        });
+    }
+};
+