public class AppStorage : DbContext
    {
private static AppStorage _instance = null;
        public static AppStorage Instance
        {
            get
            {
                if(_instance == null)
                {
                    _instance = new AppStorage();
                }
                return _instance;
            }
        }
        public AppStorage() 
            : base(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\ForumDatabaseFile.mdf;Integrated Security=True")
        { }

        public DbSet<MainForumPartition> MainForumPartitions { get; set; }
        public DbSet<ForumPartition> ForumPartitions { get; set; }
..
}

public class MainForumPartition : EntityBase
    {
        [Required]
        public string PartitionName { get; set; }
        public ICollection<ForumPartition> ForumPartitions { get; set; }
    }

public class ForumPartition : EntityBase
    {
        [Required]
        public string PartitionName { get; set; }
        public string PartitionDescription { get; set; }
        public ICollection<Topic> Topics { get; set; }
    }

internal sealed class Configuration : DbMigrationsConfiguration<SimpleForum.Database.AppStorage>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = true;
        }

        protected override void Seed(SimpleForum.Database.AppStorage context)
        {
            //  This method will be called after migrating to the latest version.

            //  You can use the DbSet<T>.AddOrUpdate() helper extension method 
            //  to avoid creating duplicate seed data. E.g.
            //
            //    context.People.AddOrUpdate(
            //      p => p.FullName,
            //      new Person { FullName = "Andrew Peters" },
            //      new Person { FullName = "Brice Lambson" },
            //      new Person { FullName = "Rowan Miller" }
            //    );
            //
            var p = new MainForumPartition() { PartitionName = "DICK" };
            p.ForumPartitions = new List<ForumPartition>();

            var f = new ForumPartition() { PartitionName = "SUB-DICK" };
            p.ForumPartitions.Add(f);

            context.ForumPartitions.AddOrUpdate(a=> a.PartitionName, f);
            context.MainForumPartitions.AddOrUpdate(a => a.PartitionName, p);
            context.SaveChanges();
                
        }
    }

            Id	PartitionName	PartitionDescription	DeactivationDate	CreationDate	MainForumPartition_Id
9572DB63-F64C-496A-8234-2C6F2B31CF44	SUB-DICK	NULL	NULL	NULL	01E014F4-D2D6-415C-BA16-A49FFDF228B7

Id	PartitionName	DeactivationDate	CreationDate
01E014F4-D2D6-415C-BA16-A49FFDF228B7	DICK	NULL	NULL