falta borrar y busqueda por columnas

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

@@ -1,35 +1,67 @@
 package com.imprimelibros.erp.users;
 
 import jakarta.persistence.*;
-import java.util.Collection;
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+
+import java.util.Set;
+
+import org.hibernate.annotations.Formula;
 
 @Entity
-@Table(name = "users")
+@Table(name = "users", uniqueConstraints = {
+    @UniqueConstraint(name = "uk_users_username", columnNames = "username")
+})
 public class User {
-    
+
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "id")
     private Long id;
 
     @Column(name = "fullname")
+    @NotBlank(message = "{validation.required}")
     private String fullName;
 
-    @Column(name = "username")
+    @Column(name = "username", nullable = false, length = 190)
+    @Email(message = "{validation.email}")
+    @NotBlank(message = "{validation.required}")
     private String userName;
-    
+
     @Column(name = "password")
+    @NotBlank(message = "{validation.required}")
     private String password;
-    
+
     @Column(name = "enabled")
     private boolean enabled;
 
     @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
-    @JoinTable(name = "users_roles",
-            joinColumns = @JoinColumn(name = "user_id"),
-            inverseJoinColumns = @JoinColumn(name = "role_id"))
-    private Collection<Role> roles;
+    @JoinTable(name = "users_roles", joinColumns = @JoinColumn(name = "user_id"), inverseJoinColumns = @JoinColumn(name = "role_id"))
+    private Set<Role> roles = new java.util.HashSet<>(); 
 
+    // SUPERADMIN=3, ADMIN=2, USER=1 (ajusta a tus nombres reales)
+    @Formula("""
+        (
+          select coalesce(max(
+            case r.name
+              when 'SUPERADMIN' then 3
+              when 'ADMIN'      then 2
+              else 1
+            end
+          ), 0)
+          from users_roles ur
+          join roles r on r.id = ur.role_id
+          where ur.user_id = id
+        )
+        """)
+    private Integer roleRank;
+
+    @Formula("""
+        (select group_concat(lower(r.name) order by r.name separator ', ')
+            from users_roles ur join roles r on r.id = ur.role_id
+            where ur.user_id = id)
+            """)
+    private String rolesConcat;
 
     /* Constructors */
     public User() {
@@ -43,7 +75,7 @@ public class User {
     }
 
     public User(String fullName, String userName, String password, boolean enabled,
-                Collection<Role> roles) {
+            Set<Role> roles) {
         this.fullName = fullName;
         this.userName = userName;
         this.password = password;
@@ -93,14 +125,22 @@ public class User {
         this.enabled = enabled;
     }
 
-    public Collection<Role> getRoles() {
+    public Set<Role> getRoles() {
         return roles;
     }
 
-    public void setRoles(Collection<Role> roles) {
+    public void setRoles(Set<Role> roles) {
         this.roles = roles;
     }
 
+    public Integer getRoleRank() {
+        return roleRank;
+    }
+
+    public String getRolesConcat() {
+        return rolesConcat;
+    }
+
     @Override
     public String toString() {
         return "User{" +
@@ -112,5 +152,5 @@ public class User {
                 ", roles=" + roles +
                 '}';
     }
-    
+
 }