Port UserRepository and remove OW stuff

Geekbot.net/Database/Models/UserModel.cs

@@ -1,7 +1,30 @@
-namespace Geekbot.net.Database.Models
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace Geekbot.net.Database.Models
 {
     public class UserModel
     {
+        [Key]
+        public int Id { get; set; }
         
+        [Required]
+        public long UserId { get; set; }
+        
+        [Required]
+        public string Username { get; set; }
+        
+        [Required]
+        public string Discriminator { get; set; }
+        
+        public string AvatarUrl { get; set; }
+        
+        [Required]
+        public bool IsBot { get; set; }
+        
+        public DateTimeOffset Joined { get; set; }
+        
+        public string[] UsedNames { get; set; }
     }
 }