ALTER TABLE files ADD CONSTRAINT files_location FOREIGN KEY (location) REFERENCES location(id) MATCH FULL;
ALTER TABLE source ADD CONSTRAINT source_maintainer FOREIGN KEY (maintainer) REFERENCES maintainer(id) MATCH FULL;
ALTER TABLE files ADD CONSTRAINT files_location FOREIGN KEY (location) REFERENCES location(id) MATCH FULL;
ALTER TABLE source ADD CONSTRAINT source_maintainer FOREIGN KEY (maintainer) REFERENCES maintainer(id) MATCH FULL;