[1] Cloud Datastore is built upon Google's Bigtable and Megastore technology.
[3] Originally released as a feature in Google App Engine in 2008,[4] Cloud Datastore was announced as a standalone product in 2013 during Google I/O.
[5] In 2018 at the Google Cloud Next conference, the second-generation Firestore database was opened to general availability, with a backward-compatibility mode.
[8] Instead, one-to-many and many-to-many relationships can be accomplished using ReferenceProperty().
[10] Switching from a relational database to Cloud Datastore requires a paradigm shift for developers when modeling their data.