Fast Formula and Timecards - User Who Last Updated (DBI/Database Item)

Summary:

In an FF, I need to retrieve the username of the last updater with respect to timecards. None of the WFM DBIs I have used thus far give results that make sense. For example, as a test, I log in as a "normal" employee and save the timecard. There are 4 DBIs I am using to try to get valid data. None of them output the employee. I have tried:

HWM_EXT_REPORTED_TIME_CARD_STATUS_LAST_UPDATED_BY

HWM_EXT_REPORTED_TIME_ENTRY_STATUS_LAST_UPDATED_BY

HWM_EXT_REPORTED_TIME_CARD_APPROVAL_STATUS_LAST_UPDATED_BY

and HWM_EXT_GROUP_LAST_UPDATED_BY