Drop so_telegraf_trim cron.absent tombstone

feature/postgres never shipped the original cron.present, so this
cleanup state is a no-op on every fresh install. The script itself
stays on disk for emergency use.

salt/postgres/enabled.sls

@@ -80,15 +80,6 @@ delete_so-postgres_so-status.disabled:
     - name: /opt/so/conf/so-status/so-status.conf
     - regex: ^so-postgres$
 
-# Retention is now handled by pg_partman (hourly maintenance via pg_cron
-# scheduled from postgres/telegraf_users.sls). The so-telegraf-trim script
-# stays on disk for manual/emergency use but is no longer scheduled.
-so_telegraf_trim:
-  cron.absent:
-    - name: /usr/sbin/so-telegraf-trim >> /opt/so/log/postgres/telegraf-trim.log 2>&1
-    - identifier: so_telegraf_trim
-    - user: root
-
 {% else %}
 
 {{sls}}_state_not_allowed: