更新项目部分结构，新增加DB

common/models/oldDb/ImMessageSessionOrder.php

@@ -0,0 +1,21 @@
+<?php
+namespace common\models\oldDb;
+
+use yii\behaviors\TimestampBehavior;
+use yii\db\ActiveRecord;
+
+class ImMessageSessionOrder extends \common\modelsgii\oldDb\ImMessageSessionOrder
+{
+    public function behaviors()
+    {
+        return [
+            [
+                'class' => TimestampBehavior::class,
+                'attributes' => [
+                    ActiveRecord::EVENT_BEFORE_INSERT => ['created_at','updated_at'],
+                    ActiveRecord::EVENT_BEFORE_UPDATE => ['updated_at'],
+                ],
+            ],
+        ];
+    }
+}