This directory contains migrations to set up a MongoDB database to match the desired schema. MongoDB is actually schema-less; what this does is to update the indexes and validation rules.
To run migrations (i.e. make your database match the expectations):
export CONN=mongodb://localhost/covid19 # or your connection string
export DB=covid19 # or your database name
npm run migrate
To create a new migration (i.e. to change the expected state of the database):
npm i -g migrate-mongo
migrate-mongo create name-of-migration
That creates a file called migrations/datetime-name-of-migration.js. Edit the up() function to apply your change, and the down() function to disapply it. Now npm run migrate (or dev/setup_db.sh at the root level, if you're testing locally in Docker, will also work).
This folder also contains import-sample-data.py, a script for importing the test data for running cypress tests (in verification/curator-service/ui/cypress in this repo). You can run it with no arguments, or via npm run import-sample-data, and it will create a curator user in the locally-running G.h instance and use that users' API key to import the data. You can choose a different user by setting the GH_API_KEY environment variable, and you can choose a different instance by setting GH_BASE_URL.