Extend Vexer attestation/export stack and Concelier OSV fixes

src/StellaOps.Vexer.Storage.Mongo/VexMongoMappingRegistry.cs

@@ -15,15 +15,51 @@ public static class VexMongoMappingRegistry
             return;
         }
 
-        if (!BsonSerializer.IsSerializerRegistered(typeof(byte[])))
+        try
         {
-            BsonSerializer.RegisterSerializer(new ByteArraySerializer());
+            BsonSerializer.RegisterSerializer(typeof(byte[]), new ByteArraySerializer());
         }
+        catch
+        {
+            // serializer already registered – safe to ignore
+        }
+
+        RegisterClassMaps();
+    }
+
+    private static void RegisterClassMaps()
+    {
+        RegisterClassMap<VexProviderRecord>();
+        RegisterClassMap<VexProviderDiscoveryDocument>();
+        RegisterClassMap<VexProviderTrustDocument>();
+        RegisterClassMap<VexCosignTrustDocument>();
+        RegisterClassMap<VexConsensusRecord>();
+        RegisterClassMap<VexProductDocument>();
+        RegisterClassMap<VexConsensusSourceDocument>();
+        RegisterClassMap<VexConsensusConflictDocument>();
+        RegisterClassMap<VexConfidenceDocument>();
+        RegisterClassMap<VexCacheEntryRecord>();
+    }
+
+    private static void RegisterClassMap<TDocument>()
+        where TDocument : class
+    {
+        if (BsonClassMap.IsClassMapRegistered(typeof(TDocument)))
+        {
+            return;
+        }
+
+        BsonClassMap.RegisterClassMap<TDocument>(classMap =>
+        {
+            classMap.AutoMap();
+            classMap.SetIgnoreExtraElements(true);
+        });
     }
 }
 
 public static class VexMongoCollectionNames
 {
+    public const string Migrations = "vex.migrations";
     public const string Providers = "vex.providers";
     public const string Raw = "vex.raw";
     public const string Claims = "vex.claims";