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to question bank - move cron to clean up old cache records move code and rename classes - further review of the quiz reports statistics code - starting to separate calculations of quiz stats, question stats and response analysis - introduce hashcode db field for cached stats convert - code to use qubaids hashcode for caches We just drop the old tables (including previous upgrade steps) and re-create the new ones, because these tables just cache calculated statistics. No important data is stored in them.