terminado sign up

src/main/java/com/imprimelibros/erp/users/User.java

@@ -57,7 +57,8 @@ public class User {
     @Column(name = "deleted_by")
     private Long deletedBy;
 
-    @OneToMany(mappedBy = "user", fetch = FetchType.LAZY, cascade = CascadeType.REMOVE, orphanRemoval = true)
+    @OneToMany(mappedBy = "user", fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST, CascadeType.MERGE,
+            CascadeType.REMOVE }, orphanRemoval = true)
     @SQLRestriction("deleted = false")
     @JsonIgnore
     private Set<UserRole> rolesLink = new HashSet<>();

src/main/java/com/imprimelibros/erp/users/UserDao.java

@@ -29,6 +29,15 @@ public interface UserDao extends JpaRepository<User, Long>, JpaSpecificationExec
 
     boolean existsByUserNameIgnoreCase(String userName);
 
+    // Para comprobar si existe al hacer signup
+    @Query(value = """
+            SELECT id, deleted, enabled
+            FROM users
+            WHERE LOWER(username) = LOWER(:userName)
+            LIMIT 1
+            """, nativeQuery = true)
+    Optional<UserLite> findLiteByUserNameIgnoreCase(@Param("userName") String userName);
+
     boolean existsByUserNameIgnoreCaseAndIdNot(String userName, Long id);
 
     // Nuevo: para login/negocio "activo"

src/main/java/com/imprimelibros/erp/users/UserLite.java

@@ -0,0 +1,9 @@
+package com.imprimelibros.erp.users;
+
+// Proyección para consultas ligeras de usuarios (id, enabled, deleted)
+public interface UserLite {
+    
+    Long getId();
+    Boolean getDeleted();
+    Boolean getEnabled();
+}