Need to fix index load issues

SVSim.EmulatedEntrypoint/Program.cs

@@ -1,3 +1,4 @@
+using System.Text.Json;
 using System.Text.Json.Serialization;
 using Microsoft.EntityFrameworkCore;
 using SVSim.Database;
@@ -22,10 +23,16 @@ public class Program
 
         builder.Services.AddControllers().AddJsonOptions(opt =>
         {
+            // Wire-format congruence: the encrypted msgpack path uses snake_case [Key("...")]
+            // names; the plain-JSON path runs through System.Text.Json. Match them by using
+            // SnakeCaseLower naming policy here so both paths emit identical key names — and
+            // so the translation middleware can hand JSON keys straight through to msgpack
+            // without per-property name remapping.
+            opt.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower;
             // Production omits null/optional fields entirely; the client uses
             // `Keys.Contains(name)` as a presence check and calls `.ToInt()` (etc.) on the
             // value without a null guard. Emitting `"key":null` makes Contains return true and
-            // crashes the client. Match prod by dropping nulls during serialization.
+            // crashes the client. Drop nulls during serialization so missing == absent.
             opt.JsonSerializerOptions.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
         });
         // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle