add automatic warn email about ticket expiration

console/migrations/m160511_062308_alter__table__customer__add__column__warn_mail_ticket_expire_enabled.php

@@ -0,0 +1,30 @@
+<?php
+
+use yii\db\Schema;
+use yii\db\Migration;
+
+class m160511_062308_alter__table__customer__add__column__warn_mail_ticket_expire_enabled extends Migration
+{
+    public function up()
+    {
+    	$this->addColumn("customer", "warn_mail_ticket_expire_enabled", "int default 1");
+    }
+
+    public function down()
+    {
+        echo "m160511_062308_alter__table__customer__add__column__warn_mail_ticket_expire_enabled cannot be reverted.\n";
+
+        return false;
+    }
+
+    /*
+    // Use safeUp/safeDown to run migration code within a transaction
+    public function safeUp()
+    {
+    }
+
+    public function safeDown()
+    {
+    }
+    */
+}