testeando el notify

src/main/java/com/imprimelibros/erp/payments/model/Payment.java

@@ -11,7 +11,7 @@ public class Payment {
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    @Column(name = "order_id", nullable = false)
+    @Column(name = "order_id")
     private Long orderId;
 
     @Column(name = "user_id")
@@ -161,4 +161,20 @@ public class Payment {
 
     public LocalDateTime getUpdatedAt() { return updatedAt; }
     public void setUpdatedAt(LocalDateTime updatedAt) { this.updatedAt = updatedAt; }
+
+    @PrePersist
+    public void prePersist() {
+        LocalDateTime now = LocalDateTime.now();
+        if (createdAt == null) {
+            createdAt = now;
+        }
+        if (updatedAt == null) {
+            updatedAt = now;
+        }
+    }
+
+    @PreUpdate
+    public void preUpdate() {
+        updatedAt = LocalDateTime.now();
+    }
 }