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There definitely haven't been any (intentional) changes to sending thumbnails in the last month.
What is the breakup of the data in thumbnails vs user metadata? user_metatata I am willing to get rid of on a per device basis.
Thumbnails can be fixed in one of several ways:
1) Stop storing them in metadata.calibre and instead use a subdirectory named calibre-thumbnails or similar. That way update jobs dont have to resend all thumbnails on every update.
2) Make it a per device driver thing. For instance e-ink kindles have calibre send thumbnails as separate files already. the driver could be changed to use those and not store thumbnails in metadata.calibre
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