The queue runner no longer uses this field, and it doesn't provide very interesting historical data (mostly SSH failures), but it takes up a lot of space. Also, it contained some bad UTF-8 which was preventing an upgrade to Postgres 9.5, so a good occasion to get rid of it.
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# Created by DBIx::Class::Schema::Loader v0.07043 @ 2016-02-12 17:20:42# DO NOT MODIFY THIS OR ANYTHING ABOVE! md5sum:/8aVtXu/+o0jmKHnSzwt+g
alter table Builds drop column errorMsg;