What are the options to reset data on production environment ?

Summary:

The customer is not yet live and would like to redo all the data migration. For that we would need a reset on production pod. 

Our customer is in the final stages of data migration and more than 200,000 historical rows for more than 13,000 employees have been loaded into both the PROD and PreProd instances.

While checking the data loaded into PROD, our customer noticed that there was a functional anomaly only in the contract data (employment contracts).

For each new contract after the HIRE, the customer would like to have an extension instead of an update (functionality used when loading or updating contracts manually). The screenshot below illustrates the current state and the desired objective.