While doing some analysis, I found a strange inconsistency.
The
ServerSideAccountCreation event logs show a user with the ID
26048397 and the name
Dhava2nd being created on the English Wikipedia at 2015-08-20 01:38:57. (Those logs do
not record autocreations).
However, that user ID doesn't exist in `enwiki.users`. The user Dhava2nd
does exist, but with the user ID
26048409 (twelve numbers later) and a registration date of 2015-08-20 01:41:07 (two minutes later). Special:Log
says that that the enwiki account was autocreated, but the centralauth database says the enwiki account was the initial creation, and that occurred at 2015-08-20 01:38:59.
In my cohort, this was the first user out of about 80,000 to have a problem like this.