Comment 4 for bug 1397899

Reviewed: https://review.openstack.org/137639
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=fc15db8a6fbda75f2ddec890a9f14a75b045f38c
Submitter: Jenkins
Branch: master

commit fc15db8a6fbda75f2ddec890a9f14a75b045f38c
Author: Ilya Pekelny <email address hidden>
Date: Wed Nov 26 18:25:56 2014 +0200

    Add index to the revocation_event.revoked_at.

    `revocation_event` model class missed index at revoked_at column, whereas a
    migration keystone/contrib/revoke/migrate_repo/versions/001_revoke_table.py:35
    provides the index. The migration looks correct, but the model doesn't
    appropriate to the migration.

    Closes-Bug: #1397899
    Change-Id: I5205f9a0e951d43badd2b11fd5b20a5d59c07ee8