DROP INDEX IF EXISTS idx_watchers_folder;
DROP INDEX IF EXISTS idx_watchers_document;
DROP TABLE IF EXISTS watchers;
DROP INDEX IF EXISTS idx_notifications_created_at;
DROP INDEX IF EXISTS idx_notifications_unread;
DROP INDEX IF EXISTS idx_notifications_user;
DROP TABLE IF EXISTS notifications;
DROP INDEX IF EXISTS idx_comments_author;
DROP INDEX IF EXISTS idx_comments_parent;
DROP INDEX IF EXISTS idx_comments_document;
DROP TABLE IF EXISTS comments;