Modify message observer

src/main/java/org/acme/UserDeleted.java

@@ -3,7 +3,7 @@ package org.acme;
 import java.time.LocalDateTime;
 import java.util.Objects;
 
-public class UserDeleted implements CollectEvent {
+public class UserDeleted implements Suspendable {
     private long id;
     private LocalDateTime timestamp;
 
@@ -23,11 +23,6 @@ public class UserDeleted implements CollectEvent {
         this.timestamp = timestamp;
     }
 
-    @Override
-    public CollectEvent.Type getType() {
-        return Type.DELETE;
-    }
-
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;