diff --git a/app/Models/ProjectTaskAiEvent.php b/app/Models/ProjectTaskAiEvent.php
new file mode 100644
index 000000000..4c1deb80e
--- /dev/null
+++ b/app/Models/ProjectTaskAiEvent.php
@@ -0,0 +1,132 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * App\Models\ProjectTaskAiEvent
+ *
+ * @property int $id
+ * @property int $task_id 任务ID
+ * @property string $event_type 事件类型
+ * @property string $status 状态
+ * @property int $retry_count 重试次数
+ * @property array|null $result 执行结果
+ * @property string|null $error 错误信息
+ * @property int $msg_id 消息ID
+ * @property \Illuminate\Support\Carbon|null $executed_at
+ * @property \Illuminate\Support\Carbon|null $created_at
+ * @property \Illuminate\Support\Carbon|null $updated_at
+ */
+class ProjectTaskAiEvent extends AbstractModel
+{
+    const EVENT_DESCRIPTION = 'description';
+    const EVENT_SUBTASKS = 'subtasks';
+    const EVENT_ASSIGNEE = 'assignee';
+    const EVENT_SIMILAR = 'similar';
+
+    const STATUS_PENDING = 'pending';
+    const STATUS_PROCESSING = 'processing';
+    const STATUS_COMPLETED = 'completed';
+    const STATUS_FAILED = 'failed';
+    const STATUS_SKIPPED = 'skipped';
+
+    const MAX_RETRY = 3;
+
+    protected $table = 'project_task_ai_events';
+
+    protected $fillable = [
+        'task_id',
+        'event_type',
+        'status',
+        'retry_count',
+        'result',
+        'error',
+        'msg_id',
+        'executed_at',
+    ];
+
+    protected $casts = [
+        'result' => 'array',
+        'executed_at' => 'datetime',
+    ];
+
+    /**
+     * 关联任务
+     */
+    public function task(): BelongsTo
+    {
+        return $this->belongsTo(ProjectTask::class, 'task_id', 'id');
+    }
+
+    /**
+     * 获取所有事件类型
+     */
+    public static function getEventTypes(): array
+    {
+        return [
+            self::EVENT_DESCRIPTION,
+            self::EVENT_SUBTASKS,
+            self::EVENT_ASSIGNEE,
+            self::EVENT_SIMILAR,
+        ];
+    }
+
+    /**
+     * 标记为处理中
+     */
+    public function markProcessing(): bool
+    {
+        return $this->update([
+            'status' => self::STATUS_PROCESSING,
+        ]);
+    }
+
+    /**
+     * 标记为完成
+     */
+    public function markCompleted(array $result, int $msgId = 0): bool
+    {
+        return $this->update([
+            'status' => self::STATUS_COMPLETED,
+            'result' => $result,
+            'msg_id' => $msgId,
+            'executed_at' => now(),
+        ]);
+    }
+
+    /**
+     * 标记为失败
+     */
+    public function markFailed(string $error): bool
+    {
+        return $this->update([
+            'status' => self::STATUS_FAILED,
+            'retry_count' => $this->retry_count + 1,
+            'error' => $error,
+            'executed_at' => now(),
+        ]);
+    }
+
+    /**
+     * 标记为跳过
+     */
+    public function markSkipped(string $reason = ''): bool
+    {
+        return $this->update([
+            'status' => self::STATUS_SKIPPED,
+            'error' => $reason,
+            'executed_at' => now(),
+        ]);
+    }
+
+    /**
+     * 是否可以重试
+     */
+    public function canRetry(): bool
+    {
+        return $this->status === self::STATUS_FAILED
+            && $this->retry_count < self::MAX_RETRY;
+    }
+}