Add "nickname" field for events
Created by Reed Essick on August 9, 2016. Copied from redmine (https://bugs.ligo.org/redmine/issues/4553)
There has been some discussion about creating a "nickname" field in GraceDB to group different GraceIDs associated with the same physical event. This field could be very useful moving forward and would be incorporated into the automatic event selection performed within approval_processor. Nonetheless, this is not absolutely necessary on a short timescale.
I believe the plan was to create another column in the database's tables, called 'nickname', and to populate it with things like "GW150914" or "LVT151012a", etc.