You are building an integration that pushes product records from an external ERP system into Dataverse. The ERP sends its own unique product code (SKU) with each message, but does not know the Dataverse GUID. Records may already exist from previous runs or may be brand new. You must ensure each incoming message either updates the matching Dataverse record or creates it if none exists, without issuing a separate query to find the record first. What should you implement?