DROP INDEX idx_activities_to_activity_id;
DROP INDEX idx_activities_to_ap_id;
DROP INDEX idx_activities_cc_activity_id;
DROP INDEX idx_activities_cc_ap_id;
DROP INDEX idx_timeline_to_timeline_id;
DROP INDEX idx_timeline_to_ap_id;
DROP INDEX idx_timeline_cc_timeline_id;
DROP INDEX idx_timeline_hashtags_timeline_id;