System units go in /etc/systemd/system User units go in $HOME/.config/systemd/user

[Unit]  
Description=Webring test service 
After=network.target
StartLimitIntervalSec=0

[Service]  
Type=simple
Restart=always
RestartSec=1
WorkingDir=/code/webring
ExecStart=/code/webring/webring --dsn /code/webring/webring.db --addr :8000
  
[Install]  
WantedBy=multi-user.target