CloudDatastore.gs is a client for Google Cloud Datastore, which runs as a Service Account.
It is written in Google Apps Script - and so far, it can select, insert, update and delete entities.
a) Add the script to https://script.google.com
b) Add the OAuth2 for Apps Script library: 1B7FSrk5Zi6L1rSxxTDgDEUsPzlukDsi4KGuTMorsTQHhGBzBkMun4iDF.
c) Upload the service account configuration file to your Google Drive (to be downloaded from https://console.cloud.google.com/project/_/iam-admin and then uploaded to https://drive.google.com).
The service account needs to have the "Cloud Datastore User" role asigned.
d) Adjust the script according to the filename of the configuration file.
@see https://github.com/googlesamples/apps-script-oauth2
@see https://stackoverflow.com/questions/49112189/49113976#49113976
@see https://cloud.google.com/datastore/docs/reference/data/rest/