rpi: ежемесячная выборочная перечитка файлов OneDrive с диска роутера (sha256) + алерты

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

stacks/rpi-backup/systemd/router-sample.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Monthly random read-back of OneDrive files from router disk (sha256)
+Wants=network-online.target
+After=network-online.target
+RequiresMountsFor=/mnt/backup
+
+[Service]
+Type=oneshot
+# ждёт, если идёт router-backup (общий lock), а не падает
+ExecStart=/usr/bin/flock /run/lock/router-backup.lock /usr/local/bin/router-backup sample
+ExecStopPost=/usr/local/bin/backup-metrics backup_router_sample
+Nice=10
+IOSchedulingClass=idle
+TimeoutStartSec=6h

stacks/rpi-backup/systemd/router-sample.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Monthly router disk read-back sample
+
+[Timer]
+OnCalendar=*-*-01 08:00
+Persistent=true
+
+[Install]
+WantedBy=timers.target