Re-run Jobs::RecoverPostUploads.

Previously, `UploadRecovery` did not account for uploads which
may be present in links. This meant that attachments were not
recovered.

db/migrate/20180919041529_remove_recover_post_uploads_onceoff_log.rb

@@ -0,0 +1,9 @@
+class RemoveRecoverPostUploadsOnceoffLog < ActiveRecord::Migration[5.2]
+  def up
+    DB.exec("DELETE FROM onceoff_logs WHERE job_name = 'RecoverPostUploads'")
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end