duplication of usernames

[danbjoseph]

Currently, user_id is the only unique constraint in the system. So, we can have multiple user with same username.
For example, we currently have around 11 sergio in the system. This makes it more difficult to troubleshoot a user's issues as it's hard to know which account is theirs. It also makes it confusing for users that search for their account directly through the Community pages (instead of clicking on the link from the profile page in the app), as there is no easy way to differentiate between user with the same username. What are our options?