diff --git a/database/migrations/2026_01_21_000000_create_project_task_ai_events_table.php b/database/migrations/2026_01_21_000000_create_project_task_ai_events_table.php
new file mode 100644
index 000000000..09b382344
--- /dev/null
+++ b/database/migrations/2026_01_21_000000_create_project_task_ai_events_table.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateProjectTaskAiEventsTable extends Migration
+{
+    public function up()
+    {
+        Schema::create('project_task_ai_events', function (Blueprint $table) {
+            $table->bigIncrements('id');
+            $table->bigInteger('task_id')->comment('任务ID');
+            $table->string('event_type', 50)->comment('事件类型: description/subtasks/assignee/similar');
+            $table->string('status', 20)->default('pending')->comment('状态: pending/processing/completed/failed/skipped');
+            $table->tinyInteger('retry_count')->unsigned()->default(0)->comment('重试次数');
+            $table->json('result')->nullable()->comment('执行结果');
+            $table->text('error')->nullable()->comment('错误信息');
+            $table->bigInteger('msg_id')->nullable()->default(0)->comment('消息ID');
+            $table->timestamp('executed_at')->nullable()->comment('执行时间');
+            $table->timestamps();
+
+            $table->unique(['task_id', 'event_type'], 'uk_task_event');
+            $table->index('status', 'idx_status');
+            $table->index('created_at', 'idx_created');
+        });
+    }
+
+    public function down()
+    {
+        Schema::dropIfExists('project_task_ai_events');
+    }
+}