Source — /etc/systemd/system/multi-user.target.wants/postgresql.service

/etc/systemd/system/multi-user.target.wants/postgresql.service

# postgresql.service is the meta unit for managing all PostgreSQL clusters on
# the system at once. Conceptually, this unit is more like a systemd target,
# but we are using a service since targets cannot be reloaded.
#
# The unit actually managing PostgreSQL clusters is postgresql@.service,
# instantiated as postgresql@15-main.service for individual clusters.

[Unit]
Description=PostgreSQL RDBMS

[Service]
Type=oneshot
ExecStart=/bin/true
ExecReload=/bin/true
RemainAfterExit=on

[Install]
WantedBy=multi-user.target