In such exceptional cases, it may happen that you lose your
subscriptions file after a Kernel Panic. One good way to contrarest
that would be to put your ~/Library/Application Support/TVShows/
folder (or only the Subscriptions file) under Dropbox, so that you
can revert it to the last version.
Also, as you say by using Miso and selecting the "Miso" option,
you would have that info in the Miso website, so that you will not
start downloading again.