text: --liquibase formatted sql
  --changeset jgke:4
  
  ALTER TABLE tags_sources DROP CONSTRAINT tags_sources_source_fkey;
  --rollback ALTER TABLE tags_sources ADD CONSTRAINT tags_sources_source_fkey FOREIGN KEY (source) REFERENCES sources(id);
  
  ALTER TABLE tags_sources DROP CONSTRAINT tags_sources_tag_fkey;
  --rollback ALTER TABLE tags_sources ADD CONSTRAINT tags_sources_tag_fkey FOREIGN KEY (tag) REFERENCES tags(id);
  