* install dependencies on Debian Bullseye
```
sudo apt install libpq-dev --no-install-recommends
```

* build
```
make
```

* run
```
./main 'postgresql://<user>:<secret>@<host>:<port>/<database>'
```

* or run
```
./main "host=<host> port=<port> user=<user> password=<<secret>> dbname=<database>"
```