Determine when to begin the aggregating of archives

Problem/Motivation

The problem is, when an individual archive is created, there is nothing to track/indicate that it is the last of the individual archives being created. As a result it is hard to know when the aggregating of the archives for keyword or theme should take place.

There are a few options... none that I have so far are ideal.

• wait until 11:59pm then begin the aggregating - creates a problem if updating is happening at that time. Also means there could be up to 24 hours where there is no aggregated archive.
• Set a timestamp in State each time an archive is created. Have cron only execute on the aggegation if more than XX minutes have ellapsed since the timestamp. The bigger the number for XX the larger the window it allows, useful if they are all being updated by hand. The smaller the number the smaller the amount of time people have to wait to see the aggregation. Maybe the XX could be in config settings?

Acceptance Criteria

Testing steps