feat(go): persist realtime snapshots to mysql

go/vehicle-gateway/cmd/realtime-api/main_test.go

@@ -42,6 +42,20 @@ func TestProcessRealtimeMessageUsesUncancelledContextForUpdateAndCommit(t *testi
 	}
 }
 
+func TestCompositeRealtimeUpdaterUpdatesBothStores(t *testing.T) {
+	env := envelope.FrameEnvelope{Protocol: envelope.ProtocolGB32960, VIN: "VIN001"}
+	redisUpdater := &contextCheckingRealtimeUpdater{}
+	snapshotUpdater := &contextCheckingRealtimeUpdater{}
+	updater := compositeRealtimeUpdater{primary: redisUpdater, secondary: snapshotUpdater}
+
+	if err := updater.Update(context.Background(), env); err != nil {
+		t.Fatalf("Update() error = %v", err)
+	}
+	if redisUpdater.count != 1 || snapshotUpdater.count != 1 {
+		t.Fatalf("updates primary=%d secondary=%d", redisUpdater.count, snapshotUpdater.count)
+	}
+}
+
 type contextCheckingRealtimeUpdater struct {
 	ctxErr error
 	count  int