Getting ready to seed more data

SVSim.EmulatedEntrypoint/Models/Dtos/CardIdentifier.cs

@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -11,6 +12,7 @@ public class CardIdentifier
     /// <summary>
     /// The identifier of the card.
     /// </summary>
+    [JsonPropertyName("card_id")]
     [Key("card_id")]
     public long CardId { get; set; }
 }