Koschei: remove rewind-unapplied-changes cronjob

This job was not functional as it needs to be ran as db admin (due to
its use of ALTER DDL command), but was ran as ordinary db user.

roles/openshift-apps/koschei/vars/production.yml

@@ -71,7 +71,3 @@ koschei_cron_jobs:
   - name: track-churchyard
     schedule: "31 0-23/3 * * *"
     command: "koschei-admin psql <<<'UPDATE package SET tracked = TRUE WHERE id IN (SELECT p.id FROM package p JOIN package_group_relation pgr ON p.base_id = pgr.base_id WHERE NOT p.tracked AND pgr.group_id = 79)'"
-  # Workaround for https://github.com/fedora-infra/koschei/issues/234
-  - name: rewind-unapplied-changes
-    schedule: "42 8 * * *"
-    command: "koschei-admin psql <<<'BEGIN; DELETE FROM unapplied_change; ALTER SEQUENCE unapplied_change_id_seq RESTART; COMMIT'"