I use it in production on Google Appengine for www.crowdgrader.org.
I store data as follows:
- The core metadata, where I need ACID, is stored in Google Cloud SQL, which is working very well for me. For big text fields, I store in Google Cloud SQL the key, and in the Datastore the key-value.
- The text typed by users is stored in the Google Datastore, see above, with the key stored in Cloud SQL.
- File uploads go in the blobstore.
I am slowly migrating more storage to the Datastore, to get more write bandwidth for things that do not require complex queries and can deal with a bit of eventual consistency.
I am very happy about web2py + appengine + Google Cloud SQL + Datastore + Blobstore.
