Deleting the book and chapter entries in the "content" table does give a pleasing result, i.e. the books no longer show up in the directory on the Kobo. However, since the stuff is still in there, the database doesn't get any smaller. I don't know much about databases; I'm trying to figure out some sqlite routine that will get all of the linked chapter and page entries to go away (because doing it manually sure would take time -- well maybe not for a single book).
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