Tim Hunt 118d3e855a
MDL-75576 quiz/question statistics: don't expire by time ...
Previously, a set of calculated quiz statistics would only 'last' for
15 minutes. Then they would be considered invalid and not used.
Now, computed statistics are kept indefinitely. Instead, when a new
batch of values are computed for a particular set of settings, older numbers
for the same settings are deleted first. Therefore,
question_stats_cleanup_task is no more.
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Tim Hunt
118d3e855a