All of your configured DBConnect queries are stored in the inputs.conf. Depending on how, and where, you created these, they will be in
$splunk_home/etc/apps/dbx/local/inputs.conf
If you have created these specifically in different APP space, you will need to check there.
Additionally, btool is your friend.
$splunk_home/bin/splunk btool inputs list --debug
Search that for your db queries, and it will tell you which file it is stored in.
Cheers
