Actually in our case, users upload files with AJAX before they submit their form which data gets inserted in the relational DB. As such I fail to see how storin

Actually in our case, users upload files with AJAX before they submit their form which data gets inserted in the relational DB. As such I fail to see how storing them in the DB helps at all because files are going to be added in an HTTP transaction that happens before the one that causes the meaningful write to the relational database.