Unfortunately the Datastore doesn't journal old data or keep it's own internal backups that we could roll back to. The only backup facility for Datastore that exists is the Datastore Admin backup to Cloud Storage <https://cloud.google.com/appengine/articles/scheduled_backups?hl=en> (or blobstore), so you might want to also check if you had this enabled and if there are any backups saved.
Regarding security I'm not aware that Vosao is affiliated with Google (there's nothing officially called 'Google CMS'). The only connection is that it's hosted on Google Code and made to work with App Engine. It looks to be an all-volunteer open source project that is now inactive (from the project's Facebook page - the project's website is now defunct). On Friday, January 8, 2016 at 12:54:26 PM UTC-5, Emilio Sanchez wrote: > > I've found the logs of Monday 4st and i've found how it could happen. > > Google CMS (Vosao) has the biggest lack of security i've ever found. the > relative /setup URL is wide opened and reinits the DB. > > Second Google Bot crawled this URL for the first time in two years despite > of no link points to it. > > Good job ! > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/2b3d0501-e2ed-48f2-a97b-105b202fbee0%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
