Protecting application table structures and data

[David Pratt <fairwinds@xxxxxxxxxxx>]

Hi. I am creating a desktop app and am interested in using postgres. I 
started this app with sqlite3 which is nice but not multi-threaded so I 
have run into its limitations.

I want to install postgres on the users machine as part of the set up 
but want the application, if possible, to be the db admin for the 
installed pg server. Is this possible?

I am hoping the application can be admin and create the tables and give 
the machine's user appropriate access without providing direct access to 
admin functions.

Alternatively, is there a way to protect the data structures and data 
through encryption to secure the structures and data in a way that 
cannot be read by a human? Many thanks.

Regards,
David