Oct 20 23:42:27 ford postgres[4004]: You must specify the --config-file or -D invocation option or set the PGDATA environment variable.

[Environment]
PGDATA=/home/mog/code/work/postgres

[Service]
ExecStart=/nix/store/a6bd2mfx4ycd9qlzyh3kqa8v55c8kywb-postgresql-9.6.15/bin/postgres
Restart=always
WorkingDirectory=/home/mog/code/work

[Unit]
Description=mogs postgr