[Unit]
Description=Bezalel Meta-Heartbeat — fires every 15 minutes (poka-yoke #1096)
Documentation=https://forge.alexanderwhitestone.com/Timmy_Foundation/the-nexus/issues/1096

[Timer]
OnBootSec=5min
OnUnitActiveSec=15min
Persistent=true

[Install]
WantedBy=timers.target