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The .cfcache files are ClipboardFusion's caching files for things like images and large amounts of text that are loaded into the Clipboard Manager so ClipboardFusion doesn't use up too much memory. I don't recommend deleting these files because it might cause some problems. ClipboardFusion will delete them from your hard drive automatically when it shuts down, and if you see a lot of these file, try clearning out some of your older images from your Local Pinned List and Clipboard History.
The .db file is ClipboardFusion's database where it stores your Clipboard History and data for it's other lists. You can delete this file, but you will lose all of your saved local items.
I hope this helps!
