add new

RS_system/Models/ReporteMensualContable.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Rs_system.Models;
+
+[Table("reportes_mensuales_contables")]
+public class ReporteMensualContable
+{
+    [Key]
+    [Column("id")]
+    public long Id { get; set; }
+
+    [Column("grupo_trabajo_id")]
+    [Required]
+    public long GrupoTrabajoId { get; set; }
+
+    [ForeignKey("GrupoTrabajoId")]
+    public virtual GrupoTrabajo GrupoTrabajo { get; set; }
+
+    [Column("mes")]
+    [Required]
+    public int Mes { get; set; }
+
+    [Column("anio")]
+    [Required]
+    public int Anio { get; set; }
+
+    [Column("saldo_inicial", TypeName = "decimal(18,2)")]
+    public decimal SaldoInicial { get; set; }
+
+
+    [Column("fecha_creacion")]
+    public DateTime FechaCreacion { get; set; } = DateTime.UtcNow;
+
+    [Column("cerrado")]
+    public bool Cerrado { get; set; } = false;
+
+    // Navigation property for details
+    public virtual ICollection<ContabilidadRegistro> Registros { get; set; } = new List<ContabilidadRegistro>();
+
+    // Helper properties for display
+    [NotMapped]
+    public string NombreMes => new DateTime(Anio, Mes, 1).ToString("MMMM", new System.Globalization.CultureInfo("es-ES"));
+}