/lib/systemd/system/postgresql.service is in postgresql-common 181+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# systemd service for managing all PostgreSQL clusters on the system. This # service is actually a systemd target, but we are using a service since # targets cannot be reloaded. [Unit] Description=PostgreSQL RDBMS [Service] Type=oneshot ExecStart=/bin/true ExecReload=/bin/true RemainAfterExit=on [Install] WantedBy=multi-user.target