Would it be possible to add an option to backup or move the database location from within Glasswire’s Interface? And also let Glasswire do it for you automagically, maybe it might solve the problem, since Glasswire created it and modifies it all the time. I don’t know how frequent it writes data, but I would like to save my SSD’s life as much as possible , and I’m sure there are people who would love this feature without going deep into your system and writing your own config file.
As for Metal450, I don’t know if this means anything, but I have no issues copying and pasting the glasswire.db on my Windows 8 system. I notice you are using Windows 7, could this be an OS issue? Although I doubt it since Windows 7 and Windows 8 changes are mostly graphical.
Edit: I just thought of something, can you try to do this in safe mode? Maybe another application is preventing you from doing this?