refactor(go): avoid duplicate realtime protocol payloads

go/vehicle-gateway/internal/realtime/repository_test.go

@@ -2,6 +2,7 @@ package realtime
 
 import (
 	"context"
+	"encoding/json"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -120,12 +121,12 @@ func TestRepositoryStoresFullParsedProtocolSnapshotAndMergesGB32960Units(t *test
 	if err != nil {
 		t.Fatalf("GetMerged() error = %v", err)
 	}
-	gb, ok := merged.ProtocolData[envelope.ProtocolGB32960]
-	if !ok {
-		t.Fatalf("merged protocol data missing: %#v", merged.ProtocolData)
+	mergedJSON, err := json.Marshal(merged)
+	if err != nil {
+		t.Fatal(err)
 	}
-	if len(gb["data_units"].([]any)) != 2 {
-		t.Fatalf("merged protocol data did not keep full parsed fields: %#v", gb)
+	if strings.Contains(string(mergedJSON), "protocol_data") {
+		t.Fatalf("merged snapshot should not duplicate full protocol parsed data: %s", string(mergedJSON))
 	}
 }