miniflux is an RSS feed reader written in go and uses postgresql as a database.
It listens by default on port 8080 so you can reverse proxy that directly.

The nginx config is included in a single site named 'orion':

location /rss/ {
		# client side auth, on fail -> 403
		if ($ssl_client_verify != SUCCESS) {
			return 403;
		}
 
		proxy_pass http://127.0.0.1:8080/rss/;
		proxy_redirect off;
		proxy_set_header Host $host;
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header X-Forwarded-Proto $scheme;
	}