Why systemd did not restart your service
Restart= watches only the main process, so a dead child inside the same cgroup is invisible. How Type=, restart limits and the journal really work.
#reliability
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RAID 10 explained for VPS storage
What RAID 1, 5, 6 and 10 survive, what a rebuild costs, and why VPS hosts pick RAID 10 for NVMe. Plus how to read /proc/mdstat, and why RAID is not a backup.
Docker Compose healthchecks that work
How Docker Compose healthchecks are evaluated, why depends_on alone waits for nothing useful, and how to write readiness checks for Postgres and your app.