BuildComponent.cs

using System;
using System.ComponentModel.DataAnnotations;

namespace WarehouseBuilder.Common.API
{
    public class BuildComponent
    {
        public virtual long Id { get; set; }
        public virtual Warehouse Warehouse { get; set; }
        public virtual int Order { get; set; }
        
        // User editable
        public virtual String DisplayName { get; set; }
        public virtual bool Enabled { get; set; }
        public virtual String BatchFile { get; set; }
        public virtual int MaxBuildMinutes { get; set; }
    }
}

Customer.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace WarehouseBuilder.Common.API
{
    public class Customer
    {
        public virtual long Id { get; set; }
        public virtual int Order { get; set; }
        public virtual ICollection<Warehouse> Warehouses { get; set; }

        // User editable
        public virtual Customer Dependancy { get; set; }
        public virtual DateTime? RunAfter { get; set; }
        public virtual String DisplayName { get; set; }
        public virtual bool Enabled { get; set; }
        public virtual int Number { get; set; }
        public virtual String BaseDirectory { get; set; }
    }
}

DatabaseContext.cs

using System.Data.Entity;
using WarehouseBuilder.Common.API;

namespace WarehouseBuilder.Common
{
    public class DatabaseContext : DbContext
    {
        public DatabaseContext() : base("Default")
        {
        }

        public DbSet<Customer> Customers { get; set; }
        public DbSet<Warehouse> Warehouses { get; set; }
        public DbSet<BuildComponent> BuildComponents { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Warehouse>().HasRequired(g => g.Customer).WithMany(g => g.Warehouses);

            modelBuilder.Entity<BuildComponent>().HasOptional(w => w.Warehouse).WithMany(w => w.Components);
        }
    }
}

Warehouse.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace WarehouseBuilder.Common.API
{
    public class Warehouse
    {
        public virtual long Id { get; set; }
        public virtual Customer Customer { get; set; }
        public virtual ICollection<BuildComponent> Components { get; set; }
        public virtual int Order { get; set; }

        // User editable
        public virtual String DisplayName { get; set; }
        public virtual bool Enabled { get; set; }
    }
}