The Salesforce History tables are quite similar to Marketo Data Value changed activities in the activiy log an would be of a great help on custom objects. Unfortunately, trying to sync them causes errors because they do not have a timestamp field. This field are not necessary since history table records cannot be updated. But synchronizing them with appropriate filtres and triggers would bring a huge benefit in detecting and handling changes to Custom object data.
So, please Marketo, enable the sync (without update) of salesforce history tables.
-Greg
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