Summary:
Fixes T4637.
- We already allow you to order by this column but don't have a key on it. Add one.
- Expose UI for querying on ranges.
Test Plan:
- Ran some queries, got reasonable-looking results and no table scans.
Reviewers: btrahan, bigo
Reviewed By: bigo
Subscribers: bigo, epriestley
Maniphest Tasks: T4637
Differential Revision: https://secure.phabricator.com/D8557
