In Campaign, contact history includes the record of the exact version offer given to each ID, including the values of personalized offer attributes, providing a complete historical view of your marketing communications.
Contact history is recorded and stored in the Campaign system database. There is a separate entry for a base contact history system table for each audience level you create. The base contact history stores the audience membership within each target and control cell used in your marketing campaigns, when all audience entities within the same cell receive exactly the same offer(s). Data from the base contact history table is used in conjunction with the
UA_Treatment system table to resolve exactly who received which offers.