Ohayocon's database has about 26,000 attendee records.
There's a bunch of duplicates. (Earlier today probably 8-9,000)
Cleaning the database is a pain in the arse.
Spent most of the day working on it.
It's down to just over 4,000 duplicates but I've taken care of most of the easy cases. (One of the duplicate pair only has name information, the records are exactly the same, etc)
Didn't get much functionality progress done, but this sort of needed done.