You will not be able to edit the wikis for up to 30 minutes on 17 January 07:00 UTC. This is because of a database problem that has to be fixed immediately. You can still read the wikis. Some wikis are not affected. They don't get this message. You can see which wikis are not affected on this page. Most wikis are affected. The time you can't edit might be shorter than 30 minutes. /Johan (WMF)