MDL-59116 analytics: Multiple predictions for each analysable time range
Now we only predict using the most recent range available, this means
that if someone upgrades to moodle 3.4 at three quarters of a course
we will only calculate the latest range, previous ranges were not
displayed anyway once more recent predictions were available.
This commit deletes all previous predictions
problem in master as we don't provide any guarantee, the alternative
(retrive sampleids from mdl_files) would have been slow and a waste of
time as well as require horrible code in an upgrade step (text fields
do not accept defaults nor we can use NOTNULL).
http://git.moodle.org/gw?p=moodle.git;a=commit;h=00da1e601095b132a95f384dd6184e1cf1f17a75
http://github.com/moodle/moodle/commit/00da1e601095b132a95f384dd6184e1cf1f17a75
+ 3.4 en [nodata,core_analytics]
+ 3.4 en [nonewranges,core_analytics]
+ 3.4 en [noranges,core_analytics]