Might be some kind of journaling being written every time a transaction or form is run. Still some querries may be used in a manual process or a view or something like that.
I would think any database system would have some kind of file that keeps track of who is running what, just from a security standpoint. If something goes wrong you need to be able to track it down to the source.
In our database the last user is kept on each file so we know who created the record and who changed the record last. This may not tell you how it was created, but it can be useful.
If you do not like my post feel free to point out your opinion or my errors.