[Data rearchitecture] Fix minor bug in RevisionStatTimeslice #6186
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What this PR does
This PR fixes a bug in
RevisionStatTimeslice
. Since the TIMEFRAME is set to 7 days, therecent_revisions_for_courses_user
method fails if a course started yesterday because it attempts to retrieve a course wiki timeslice from seven days ago, which doesn't exist.This fix ensures that the start period never references a date earlier than the course start date.
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