adding draft subtask logic to backend

be/database/migrations/2025_12_03_120000_add_is_draft_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->boolean('is_draft')->default(false)->after('is_finished');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('sub_tasks', function (Blueprint $table) {
+            $table->dropColumn('is_draft');
+        });
+    }
+};
+