会议事件添加时间戳

common/src/main/java/cn/wildfirechat/pojos/ConferenceDestroyEvent.java

@@ -3,4 +3,9 @@ package cn.wildfirechat.pojos;
 public class ConferenceDestroyEvent {
     public String userId;
     public String roomId;
+    public long timestamp;
+
+    public ConferenceDestroyEvent() {
+        timestamp = System.currentTimeMillis();
+    }
 }