With CinEx HD Utility 1.6 you can also uninstall the database files out of the software.
Requirements
CinEx HD Utility– Download and install the latest rendition of CinEx HD Utility
Step 1: Start CinEx HD Utility
Start CinEx HD Utility and select the movie you want to uninstall (1).
Step 2: Uninstall
Open the popup menu with clicking the right mouse button and click on “Uninstall” (2).