correct regression and add integrity spec for onceoffs

spec/integrity/onceoff_integrity_spec.rb

@@ -0,0 +1,14 @@
+require "rails_helper"
+
+describe Jobs::Onceoff do
+  it "can run all once off jobs without errors" do
+    # load all once offs
+
+    Dir[Rails.root + 'app/jobs/onceoff/*.rb'].each do |f|
+      require_relative '../../app/jobs/onceoff/' + File.basename(f)
+    end
+    ObjectSpace.each_object(Class).select { |klass| klass < Jobs::Onceoff }.each do |j|
+      j.new.execute_onceoff(nil)
+    end
+  end
+end