With the release of Confluene 5.2, the unique identifier for a user was changed from their username to a user key to facilitate user renaming. I want to know how unique this new user key is. If I am writing an Atlassian Connect plugin that will be run on several Atlassian servers, can I trust these user keys to be globally unique? In other words, if I store all of the user keys in the same table in our database regardless of which Atlassian server the user comes from, will user keys alone be enough to guarantee uniqueness for the primary key of the table?
