[Unit]
Description=Refresh the CTF challenge status every 30 minutes

[Timer]
OnCalendar=*:0/30
# don't hammer Nextcloud and HedgeDoc on the exact half hour
RandomizedDelaySec=60
AccuracySec=30s
# catch up on the last run if the machine was down when it was due
Persistent=true

[Install]
WantedBy=timers.target