Yesterday Chris Toshok commit the e-d-s modules change that let evolution data server load dynamically the backends it works with. This morning I have converted the Planner backend so now, it works without the need to touch anything in e-d-s code. Great! With this change, development will be easier because I don't need anymore to relink all the e-d-s binaries to test the Planner backend.
This morning also, I have tested the Planner postgres backend from evolution, and it works as expected. The main problem is the URI Planner needs to load projects from the database: sql://acs@localhost#db=plannerdb&id=2. I think we are going to need some kind of integration here, maybe using the gnome-db data sources tool in Planner and Evolution in order to configure the database access.