[Shotwell] Downgrading a database-- preventing development version from touching anything important?

[Conrad Dean]

Hey everyone,

Thanks to all the great work at Yorba I've finally been able to build
Shotwell from source on my own machine!  When I noticed it finally
built without any errors I excitedly fired up the newly built Shotwell
and everything ran smoothly.  Awesome!

To make sure nothing's been changed I opened up the Ubuntu package
install of Shotwell (0.9.3) and was greeted with this error:

"Your photo library is not compatible with this version of Shotwell.
It appears it was created by Shotwell 0.11.0+trunk (schema 14).  This
version is 0.9.3 (schema 12).  Please use the latest version of
Shotwell."

Since 0.11 is the current release, I'm not concerned about anything
breaking, but how can I go about preventing Shotwell from touching my
personal database in the future?

Also, less important of a concern, is it possible to downgrade a
database so that older versions of Shotwell can be used on it?

Thanks!
Conrad