first commit

systemd/cleanup-smartcam-data.service

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+[Unit]
+Description=Clean old video files to keep /userdata free space
+Documentation=man:systemd.service(5)
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/cleanup-smartcam-data
+Nice=10
+IOSchedulingClass=best-effort
+IOSchedulingPriority=7

systemd/cleanup-smartcam-data.timer

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+[Unit]
+Description=Run safe userdata video cleanup every 5 minutes
+Documentation=man:systemd.timer(5)
+
+[Timer]
+OnBootSec=2min
+OnUnitActiveSec=5min
+AccuracySec=30s
+Persistent=true
+Unit=cleanup-smartcam-data.service
+
+[Install]
+WantedBy=timers.target