delete https://{region}-api.dotdigital.com/insightData/v3/collections//empty
Deletes all records from the specified Insight data collection but not the collection itself, so further data can be added without removing dependencies to product recommendations, campaigns, or segments.
Notes: The deletion is asynchronous progress can be monitored by calling getAsyncStatus If you empty a contact scoped Insight data collection then all data for all contacts in that collection will be removed