Hi,
I used the database attached method to migrate a MOSS 2007 database with SPD workflow. After migrating to SP 2010, I also edit the workflow and republished it. I can still see the individual history associated with a list item.
After migrating from SP 2010 to SP 2013, the workflow association on the list is there, and I can open the workflow history list as well. I just cannot see the history being displayed for a list item. Did I miss something?