what is the table to find first approver info for requisition

Summary:

i am using wftask table to find information of first approver for a requisition but its not bringing the details for old requisitions ( 5 year old), so tried using wftaskhistory but still the same, please can you help me in finding out the actual table where front end screens are retrieving data for old data , as it is clearly visible for them there.

Content (required):

Manage requisitions screen

Version (include the version you are using, if applicable):

22D

Code Snippet (add any code snippets that support your topic, if applicable):