db and auth refactoring

Sledgemapper.Api/Core/Entities/Session.cs

@@ -0,0 +1,16 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Sledgemapper.Api.Models
+{
+    public class Session
+    {
+        [Key]
+        public int SessionId { get; set; }
+
+        [Required]
+        public string SessionName { get; set; }
+
+        [Required]
+        public int OwnerUserId { get; set; }
+    }
+}