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Author SHA1 Message Date
Nate Collings 4ec3a769ba add an index on submissions.graded_at 
This is to improve some very slow queries
that are filtering on huge numbers of
submissions.

test plan:
  - make sure the index exists

refs PFS-10106

Change-Id: I1b21ac3db2ec59f8a83144d263e20003550698ea
Reviewed-on: https://gerrit.instructure.com/142853
Tested-by: Jenkins
Reviewed-by: Rob Orton <rob@instructure.com>
Product-Review: Rob Orton <rob@instructure.com>
QA-Review: Rob Orton <rob@instructure.com>
 2018-03-07 19:50:40 +00:00