We ingest main content types for Events, Artists, and Venues and would like the ability to designate a specific ID (i.e. Event ID which is a text field within one of our content types) to act as a unique key. We have had issues with duplicate content types being created programmatically in WCH and there appears to be no clear mechanism to prevent this through the UI. The hope is that once a field is set as the key, if a new content type is created with that same exact ID, it can be rejected as a duplicate.