Ever growing Datastore - Management ? -- API or Tool to Manage it?

The Datastore seems to be growing out of all control, as there seems to be no
way to inspect what is in or manage its content… Short of deleting almost
everything back on the Cloud, and effective starting with a clean slate, (Cmd
line option), is there any other way, to see a list of say “owners” of data in
the Datastore, with the option to delete their data. If there any reason why
there could not be an API for the Datastore, that would allow such a tool to
be written, by a 3rd party, if this is something that is not in future plans
for Asobo to created themselves , Also, is there a size limit on the Datastore