[Labs-l] User registration time is NULL

[Damian Zaremba]

Around 6 hours ago it appears the user_registration column on the 
enwiki_p users table was NULL'd.

Is there any reason for this? The column previously contained the 
registration time for users.

MariaDB [enwiki_p]> SELECT `user_registration` FROM `user` WHERE 
`user_registration` != NULL;
Empty set (6.71 sec)

The toolserver contains this information and labs had done up until 
around 07:50 today.

Unfortunately as CBNG required this information for certain whitelisting 
(such as is the user a new user), it broke the bot from reverting any 
vandalism for around 6 hours.

It doesn't fill me with confidence that such a change would happen 
randomly with no notice.

- Damian