public class User
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Login { get; set; }
        public string Password { get; set; }
        public string Email { get; set; }
        public Role Role { get; set; }
        public List<Ticket> TicketsToMe { get; set; }
        public List<Ticket> TicketsFromMe { get; set; }
        public List<Project> Projects { get; set; }
    }

public class Ticket
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public string Description { get; set; }
        public DateTime DateCreated { get; set; }
        public DateTime DateUpdated { get; set; }
        public Priority Priority { get; set; }
        public Project Project { get; set; }
        public int ProjectId { get; set; }
        public User UserFrom { get; set; }
        public int UserFromId { get; set; }
        public User UserTo { get; set; }
        public int UserToId { get; set; }
        public Status Status { get; set; }
    }

public class Project
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public string Description { get; set; }
        public User ProjectManager { get; set; }
        public int ProjectManagerId { get; set; }
        public DateTime DateCreated { get; set; }
        public List<Ticket> Tickets { get; set; }
    }