reference "cm_remove_story_from_controversy" activity by its controversies_id, not by stories_id for easier finding
reference "cm_media_merge" activity by its controversies_id, not by media_id for easier finding
reference "cm_story_merge" activity by its controversies_id, not by stories_id for easier finding
possible improvement about how "story_edit" activity can be extended
reference "cm_search_tag_change" activity by its controversies_id, not by stories_id for easier finding; rearrange action's options
MediaWords::DBI::Activities helper Perl package with a list of available activities