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Helps avoid mixing recent data from results "without patch" (which are
shifted to one year in the past), with old data that actually ran a
year ago.

Also helps making sure that the size of the csv file with the uploaded
dataset does not grow without bounds.

Bug: 1006723
Change-Id: I9e5f847563e5ab62c937ef7236fd10094fd003eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1819501Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698914}