first commit

RS_system/Models/RolUsuario.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Rs_system.Models;
+
+[Table("roles_usuario")]
+public class RolUsuario
+{
+    [Column("usuario_id")]
+    public long UsuarioId { get; set; }
+    
+    [Column("rol_id")]
+    public int RolId { get; set; }
+    
+    [Column("asignado_en")]
+    public DateTime AsignadoEn { get; set; } = DateTime.UtcNow;
+    
+    // Navigation properties
+    [ForeignKey("UsuarioId")]
+    public Usuario Usuario { get; set; } = null!;
+    
+    [ForeignKey("RolId")]
+    public RolSistema Rol { get; set; } = null!;
+}