On Linux (Debian/Ubuntu)
sudo apt-get install postgresql libpq-dev
Create DB user and grant privileges
sudo -u postgres createuser <username>
$ sudo -u postgres psql psql=# alter user <username> with encrypted password '<password>';
psql=# grant all privileges on database <dbname> to <username> ;
ALTER USER <username> CREATEDB;
rake db:create
rake db:migrate
Run the bot
ruby bot.rb