Afterthe data is migrated, perform an update on all records to set the original date in a standard CreatedDate field.

Create a new field on Contact object to capture the Created Date. Hide the standard CreatedDate field using Field -Level Security.

Enable"Set Audit Fields" and assign the permission to the user loading the data for the duration of the migration.

Write an Apex trigger on the Contact object, before insert event to set the original value in a standard CreatedDate field.

Create a custom object in salesforce to capture and store all reward program. Populate nightly from the point-of-scale system, and present on the customer record.

Capture the reward program data in an external data store and present the 12 months trailing summary in salesforce using salesforce connect and then external object.

Provide a button so that the agent can quickly open the point of sales system displaying the customer history.

Create a custom big object to capturethe reward program data and display it on the contact record and update nightly from the point-of-scale system.

Make use of a third -party tool to help merge duplicate Contacts across Accounts.

Use Data.com to standardize Contact address information to help identify duplicates.

Use Workflow rules to standardize Contact information to identify and prevent duplicates.

Make use of the Merge Contacts feature of Salesforce to merge duplicates for an Account.