first commit

RS_system/Models/Usuario.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Rs_system.Models;
+
+[Table("usuarios")]
+public class Usuario
+{
+    [Key]
+    [Column("id")]
+    public long Id { get; set; }
+    
+    [Column("persona_id")]
+    public long? PersonaId { get; set; }
+    
+    [Column("nombre_usuario")]
+    [Required]
+    [StringLength(50)]
+    public string NombreUsuario { get; set; } = string.Empty;
+    
+    [Column("email")]
+    [Required]
+    [StringLength(255)]
+    public string Email { get; set; } = string.Empty;
+    
+    [Column("hash_contrasena")]
+    [Required]
+    public string HashContrasena { get; set; } = string.Empty;
+    
+    [Column("activo")]
+    public bool Activo { get; set; } = true;
+    
+    [Column("ultimo_login")]
+    public DateTime? UltimoLogin { get; set; }
+    
+    [Column("creado_en")]
+    public DateTime CreadoEn { get; set; } = DateTime.UtcNow;
+    
+    [Column("actualizado_en")]
+    public DateTime ActualizadoEn { get; set; } = DateTime.UtcNow;
+    
+    // Navigation properties
+    [ForeignKey("PersonaId")]
+    public Persona? Persona { get; set; }
+    
+    public ICollection<RolUsuario> RolesUsuario { get; set; } = new List<RolUsuario>();
+}