tentative campaign map management

Sledgemapper.Api/Core/Entities/Session.cs

@@ -1,3 +1,4 @@
+using System;
 using System.ComponentModel.DataAnnotations;
 
 namespace Sledgemapper.Api.Models
@@ -7,10 +8,13 @@ namespace Sledgemapper.Api.Models
         [Key]
         public int SessionId { get; set; }
 
+        [Required]
+        public Guid CampaignId { get; set;  }
+
         [Required]
         public string SessionName { get; set; }
 
         [Required]
-        public int OwnerUserId { get; set; }
+        public string OwnerUserId { get; set; }
     }
 }