The 10 required queries are located in the sql/queries.sql and mongo/queries.mongo files for Postgres and Mongo respectively.
The 2 required views are located in the file sql/views.sql and mongo/views.mongo files for Postgres and Mongo respectively.
The API implementation is located in the api directory and its documentation in the api/README.md file.
The implementation of the migration from Postgres to Mongo is located in the mongo directory and its documentation in the mongo/README.md file.