1. A method comprising: capturing and storing, as a captured application server system workload, a plurality of capture-phase application requests sent to a capture-phase application server system; assigning an identifier to each capture-phase application request of the plurality of capture-phase application requests; for at least one capture-phase application request of the plurality of capture-phase application requests, propagating the particular identifier assigned to the at least one capture-phase application request in a capture-phase database request caused by the at least one capture-phase application request, wherein the at least one capture-phase database request comprises a database command; capturing one or more database sequence numbers assigned to the database command when executed during the capture-phase by a capture-phase database server system against a capture-phase database; and storing workload data that represents an association between the database command, the one or more database sequence numbers, and the particular identifier assigned to the at least one capture-phase application request; wherein the method is performed by one or more computing devices.