As the title says, "Is it possible to differentiate extract refreshes triggered manually from those triggered by a schedule?" by using information in the Tableau repository?
There may be other methods, but the one I know right off the top of my head is that the backgrounder for the manually triggered "run now" extract will be 0. And the background priority for all the scheduled tasks will be in the range of 1 to 99.
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Retrieving data ...