Additional indexes for performance.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13965 e27351fd-9f3e-4f54-a53b-843176b1656c
Additional indexes for performance. Hash partitioning upgrade/downgrade scripts.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13966 e27351fd-9f3e-4f54-a53b-843176b1656c