Fix missing primary key

T120B165-ImgBoard/Models/User.cs

@@ -13,6 +13,9 @@ public static class UserRoles
 public class RefreshToken
 {
     [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+    
     [Column(TypeName = "LONGTEXT")]
     public string Token { get; set; }
     public User User { get; set; }