remove a bunch of unused indexes

This removes some of the indexes suggested by #195 (closed). It only removes the "true hivemind" indexes: several of the unused indexes are created by HAF registration of the tables (and haf should probably not be creating these indexes since this is a non-forking app). But that's a question for another issue (haf#272).

enabled an automatic merge when all merge checks for 28f1e4a5 pass

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• 6dc32f8b - remove references to removed indexes

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enabled an automatic merge when all merge checks for 6dc32f8b pass

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merged