Disable wp-cron and use system cron
WP-Cron only fires when someone loads a page, so it stalls on quiet sites and piles up on busy ones. Move it to system cron with WP-CLI, and verify it ran.
#cron
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Run a program as a systemd service on a VPS
A systemd service keeps your program running: start on boot, restart on crash, log to the journal. How to write one, add a timer, and harden it.