File package.json contains path to data directory, you can move this folder to any other (by default data directory for web server same as root folder with package.json).
{
...
"serverDataDirectory": "./",
...
}
This directory always contain logs and other configuration entities.
After server start in root folder will created rats.json - main configuration files. You can configurate port and database path in it:
{
"dbPath": "e:\\Projects\\rats\\db",
"httpPort": 8095
}
Where "httpPort" port which listen http server and "dbPath" path to database folder with collection of torrents