It says the query was stopped but I did not stop it.
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Bug report: https://phabricator.wikimedia.org/T377010 I can't run any queries because they get stopped!
I had that too. I assumed a dbadmin stopped it as it was running for a long time.
That could be the case. It could also be because there were issues with the database or because some limit was hit. I think at a minimum it should display some error message / info. One of the queries did run through now and with the bug report above I guess this is solved here.