Tool
Cloud Spanner is Google Cloud's always-on database for intelligent applications. It combines relational, graph, key-value and search capabilities in a single database and is presented as supporting virtually unlimited scale without maintenance windows. In the cited enterprise-agent architecture, it is used as a production memory and checkpoint database on Google Cloud.
1 use taken from transcripts — each links to the moment in the video.
Production memory/checkpoint DB on GCP
1 in the library.