shared roster opts column

I am trying to manage my shared roster groups with some database triggers. My current setup uses a postgresql db and I have the shared roster module setup to use postgres. When I manually add/update groups and user I can see that changes in the sr_group and sr_user table. The only thing that is confusing me is the purpose of the 'opts' column in the sr_group table.

Does anyone know what this does and what the different numbers mean? The ejabberd server is part of a much larger system and based on how users login they are placed into different groups. So as groups are created and users are added/removed, we want the shared roster groups to do the same.