first commit

RS_system/Models/RolPermiso.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Rs_system.Models;
+
+[Table("roles_permisos")]
+public class RolPermiso
+{
+    [Column("rol_id")]
+    public int RolId { get; set; }
+
+    [Column("permiso_id")]
+    public int PermisoId { get; set; }
+
+    [Column("asignado_en")]
+    public DateTime AsignadoEn { get; set; } = DateTime.UtcNow;
+
+    // Navigation properties
+    [ForeignKey("RolId")]
+    public RolSistema Rol { get; set; } = null!;
+
+    [ForeignKey("PermisoId")]
+    public Permiso Permiso { get; set; } = null!;
+}