sshd/sftp backed by db

[Chuck Johnstone]

To simplify our application we implemented a db backend to ftpserver and 
hosted it in our webapp.  Now we can use FTPS load/access files directly 
from the db, a very nice feature.

Now we want to do the same thing with SFTP.  SSHD 0.4.0 has support for 
SFTP.  Is hosting files in the db a feasible feature in SSHD?

If so what class should I look at to get started, StfpSubsystem?  A 
quick hint in the right direction would be appreciated, I can figure out 
the details...

Thanks
Chuck Johnstone