Include and make use of update timestamps for all entries.
Review Request #888 - Created Sept. 27, 2017 and updated
Entries for the review request page previously only had a single timestamp, representing the time the entry was first added, and dictating the order of the page. The new code for handling updates to entries on review requests checked that timestamp, and while this appeared to work in a developer server environment (possibly a timezone issue, which is still being looked at), it wasn't working in production. This change introduces a new "updated" timestamp, representing when an update was made to the entry. The existing timestamp is now an "added" timestamp, used for order and "new entry" calculations. The "updated" timestamp factors in things like replies to reviews and state changes for status updates. The update checks make use of this now to determine whether the entry's new HTML and metadata should be loaded onto the page. Unit tests were also added for all the new timestamp logic, and to ensure update processing is now handled appropriately when there are updates to existing entries. Testing Done: Tested with pending -> resolved status updates. Checked the timestamps of the updates coming in and made sure that the `addedTimestamp` didn't change, but that `updatedTimestamp` did. Manually checked the added/updated timestamps of other entries in response to changes I made. All unit tests pass. Reviewed at https://reviews.reviewboard.org/r/9195/
- Did step one
- did step two