While the Food Computer is running, you can access the database in your browser, using the Food Computer's IP address:
http://<food computer IP>:5984/_utils/
This will open up CouchDB's "Futon" interface, a GUI for editing the DB.
You can also interact with the database via its API. See openag_brain API for more.
The database can be configured via JSON files called Fixtures. See Fixtures for more.