add migration that should have been part of 38d2707946

db/migrate/20200820140526_remove_summable_setting.rb

@@ -0,0 +1,8 @@
+class RemoveSummableSetting < ActiveRecord::Migration[6.0]
+  # Do not need a down migration as we simply fall back on the default settings
+  def up
+    execute <<~SQL
+      DELETE FROM settings WHERE name = 'work_package_list_summable_columns'
+    SQL
+  end
+end