diff --git a/apps/counter/api/serializers.py b/apps/counter/api/serializers.py
index e69de29..cd2e382 100644
--- a/apps/counter/api/serializers.py
+++ b/apps/counter/api/serializers.py
@@ -0,0 +1,4 @@
+from rest_framework import serializers
+
+
+class
\ No newline at end of file
diff --git a/apps/counter/models.py b/apps/counter/models.py
index b51f34f..ca74911 100644
--- a/apps/counter/models.py
+++ b/apps/counter/models.py
@@ -40,6 +40,9 @@ class DeviceInfo(models.Model):
     maintain_server_ip = models.CharField(max_length=15, blank=True, null=True, verbose_name='备用服务器IP')
     maintain_server_port = models.IntegerField(blank=True, null=True, verbose_name='备用服务器端口')
     last_connect = models.DateTimeField(blank=True, null=True, verbose_name='最后连接时间')
+    online = models.IntegerField(verbose_name='是否在线')
+    session_id = models.CharField(max_length=36, blank=True, null=True)
+    last_offline_time = models.DateTimeField(blank=True, null=True, verbose_name='上次离线时间')
 
     class Meta:
         managed = False