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Out of curiosity, why are you looking for the ISBN in the the KoboReader.sqlite database? As far as I have ever seen, all kepubs get that UUID/GUID identifier whether sideloaded or synced from Kobo and the ISBN is not used. In point, most epubs that I've looked at lately have tended to use this format for the book identifier though there may be many other dc:identifiers present:
<dc:identifier id="uid">urn:uuid:444a7d08-5362-4faf-976e-3b80c80d66fe</dc:identifier>
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