Test task #4 - working with SQL and Database

1 - Create a database on Heroku
2 - Write a script saving data obtained from task #11 (python/golang on backend) to a database previously deployed on Heroku
3 - Write a script for returning requested data

Start by reviewing task #11 to identify the data that must be stored, then determine the backend entry points for persistence and retrieval and the Heroku database setup. Done means a Heroku database exists, data from task #11 can be saved to it, and requested data can be returned by a script.

Written by the indexing model from the issue text.