In my case,,
database is under the C:\ProgramData\DAZ 3D\Content Management Service
then CMS aprication is under the C:\Program Files\DAZ 3D
I do not know,, why the difference happen from Jimmy,,,
but you may find database of CMS under programdata folda,, I think.
windows 7 64 bit version.
daz studio 18.104.22.168
if now daz CMS database should be installed in program files,,
I had not uninstalled corerctly CMS when version up ds, (many times version up,, last year,,)
I may need to re install CMS,,, (no hope,,,reinstall again,,)