Chula doesn’t have any dependencies unless you use session. If you want support for session, you will use one of the following:
Install the server and client:
sudo apt-get intall postgresql python-psycopg2
Then download the source Chula tarball from Changelog and do:
tar -zxvf path/to/downloaded/tarball
sudo su - postgres
cd /path/to/exploded/tarball
./sql/session/rebuild
This will create a user, database, and schema.