After my canceled experiment with Gregarius I came across Tiny Tiny rss:

See there for a complete FeatureList.

Update: Commands needed to set up the MySQL database:

create database ttrss;
grant alter,create,delete,drop,insert,update,select
on ttrss.* to ttrss identified by <password>;
mysql -u ttrss -D ttrss -p < schema/ttrss_schema_mysql.sql