falta vista de pagos

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

@@ -120,4 +120,13 @@ public class PaymentTransaction {
 
     public LocalDateTime getCreatedAt() { return createdAt; }
     public void setCreatedAt(LocalDateTime createdAt) { this.createdAt = createdAt; }
+
+    @PrePersist
+    public void prePersist() {
+        LocalDateTime now = LocalDateTime.now();
+        if (createdAt == null) {
+            createdAt = now;
+        }
+    }
+
 }