2009/3/25 Thomas Dalton <thomas.dalton(a)gmail.com>om>:
An extra column in any table with a "user
id" column for "original
user id" (which would be identical to user id for the vast majority of
rows) would be sufficient for most unmerges. There would still be a
problem if an account was involved in more than one merge, though.
I can see such being the case, e.g. prolific sockpuppeting vandals.
However, preserving the "original UID" in all merges would likely
suffice - I mean, a complete unmerging would be OK in all cases I can