[oddcsmjh] Database as cloud storage

Let a cloud data storage service provide a database interface.  The user's client software could put a layer over it making it appear like a filesystem, e.g., Dropbox.  This is in contrast to cloud services nowadays which provide only a filesystem interface.

Curiously, a filesystem backed by a database is an inversion of the typical implementation on a database server.

Tools like grep and ls could use the database interface to more efficiently process queries.  A database could provide useful sophisticated operations for a filesystem, e.g., transactions or multiple versions of a file.