70cf025bc4
Having the primary key be (account_id, external_id) tuple was wrong, we required exactly one match from an account_id in order to login a user to their account. If multiple matches were found we failed with an exception and denied access. When we move to a git based backend we really need external_id to be the proper primary key of this entity, so we should fix it now before more duplicates show up in real world databases. Change-Id: Idd44dd67574fedb48e3e0bbd43526e1e67392dfc Signed-off-by: Shawn O. Pearce <sop@google.com> Reviewed-by: Grzegorz Kossakowski <grek@google.com>