Employee_withInv.cs

  [Table("Duties")]
  public class Duty
  {
      [PrimaryKey, AutoIncrement]
      public int Id { get; set; }

      public string Description { get; set; }

      public DateTime Deadline { get; set; }

      [ForeignKey(typeof(Employee))]
      public int EmployeeId { get; set; }

      [ManyToOne]
      public Employee Employee { get; set; }
  }