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Function: SqlBagOStuff::set
Error: 1062 Duplicate entry 'mediawiki-bw_:translate-groups' for key 1 (localhost)

I guess this is because two threads were trying to update it at the same time. In my opinion it should not throw an exception in cases like this.

set() uses a delete() followed by an insert() ; it should use replace() instead.

Fixed in r70203