* build

```
make
```

* run

```
./main 'postgresql://<user>:<secret>@<hostname>:<port>/<db>'
```

* or run

```
./main 'postgresql://<user>:<secret>@<hostname>:<port>/<db>'
```

* or run

```
./main "host=<hostname> port=<port> user=<user> password=<<secret>> dbname=<db>"
```