Bruji

There appears to be no way to delete an entire CDpedia or DVDpedia database that's been synced to PocketPedia.

If you have synced them both, you can swipe left to delete on the root view of Pocketpedia. Where it says "CDpedia" or "DVDpedia". If there is a single database synced, then a new sync of another database will overwrite, so no need to delete.