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
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migrate	add an index on submissions.graded_at	2018-03-07 19:50:40 +00:00