I propose to change in app-misc/cds-meta ebuild in section RDEPEND next line:

- dev-db/postgresql-server
+ virtual/postgresql-server

becouse virtual/postgresql-server provide next package: ||( dev-db/postgresql-server dev-db/postgresql )

Ie if in you sistem exist dev-db/postgresql-server - you hasn't any changes

But if you have gentoo(pure) and if in you system exist dev-db/postgresql - it block dev-db/postgresql-server