copy and paste service-a for add cqrs design

src/main/java/com/example/mmad/testapp/event/UserCreatedEvent.java

@@ -0,0 +1,25 @@
+package com.example.mmad.testapp.event;
+
+public class UserCreatedEvent {
+    private final Long userId;
+    private final String username;
+    private final String email;
+
+    public UserCreatedEvent(Long userId, String username, String email) {
+        this.userId = userId;
+        this.username = username;
+        this.email = email;
+    }
+
+    public Long getUserId() {
+        return userId;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+}