[Unit]
Description=mastodon-db-backup
Wants=postgresql.service
AssertFileIsExecutable=/usr/local/bin/mastodon-db-backup

[Service]
Type=oneshot
User=mastodon
Group=mastodon
WorkingDirectory=/home/mastodon
ExecStart=/usr/local/bin/mastodon-db-backup

[Install]
WantedBy=multi-user.target