To improve deletion of old entries in project_bandwidth_daily_rollup
we need index on `interval_day` column which is used to find those old
entries.
As an addition we are changing interval how often deletion is executed
from 7 to 1 day. We would like to have smaller portion of data to
delete.
Fixes https://github.com/storj/storj/issues/5465
Change-Id: Ie18ebe859887b93d6e4e6065a61fb9214c7ad27a
