I have renamed the script and killed the process (and subsequently rebooted), added my own pictures and set the attributes using the new feature. And deleted the Flickr files that it had already downloaded.
Unfortunately, before I thought it through, I just deleted the Flickr photos and directories with a sudo rm command...
Then subsequently realised that this wasn't going to clear out the database - no matter, I thought I would just resync. Did that successfully, but it seems that this won't delete it from the database. When I use the file sync section and browse the folders for my pics, it has "Screensaver for MD: *" next to each of them. When I click on the "*" it takes me to the list of all pics marked with the screensaver attribute, and it still lists hundreds of Flickr photos, albeit with "!" next to their name. I could delete them manually, but this would take hours as there are about 14 pages of them and you can't multiple select!
How can I clean up the database given that resync doesn't do it? I have tried to recreate the flickr folder, resync, and then delete it again using the web site, but this doesn't seem to reconnect with the database and clean it up....
Any advice?