How do you run Uvicorn with systemd for automatic restarts and log rotation?

# /etc/systemd/system/myapp.service
[Unit]
Description=My FastAPI Application
After=network.target

[Service]
Type=simple
User=www-data
Group=www-data
WorkingDirectory=/var/www/myapp
Environment="PATH=/var/www/myapp/.venv/bin"
EnvironmentFile=/var/www/myapp/.env
ExecStart=/var/www/myapp/.venv/bin/uvicorn main:app \
    --host 127.0.0.1 \
    --port 8000 \
    --workers 4 \
    --loop uvloop \
    --log-level warning
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target

# Enable and start the service
sudo systemctl daemon-reload
sudo systemctl enable myapp
sudo systemctl start myapp

# Check status and logs
sudo systemctl status myapp
journalctl -u myapp -f      # follow live logs
journalctl -u myapp --since "1 hour ago"

# Reload after config change
sudo systemctl restart myapp

# Graceful restart (sends SIGTERM then restarts)
sudo systemctl reload-or-restart myapp

# Socket activation (advanced - systemd creates the socket)
# myapp.socket + myapp.service - Uvicorn started only when first connection arrives
uvicorn main:app --fd 0  # fd 0 passed by systemd socket activation