feat: ftime logic for usertitle is changed

sql/migrations/000001_init.up.sql

@@ -170,17 +170,4 @@ EXECUTE FUNCTION update_title_rating();
 CREATE TRIGGER trg_notify_new_signal
 AFTER INSERT ON signals
 FOR EACH ROW
-EXECUTE FUNCTION notify_new_signal();
-
-CREATE OR REPLACE FUNCTION set_ctime()
-RETURNS TRIGGER AS $$
-BEGIN
-    NEW.ctime = now();
-    RETURN NEW;
-END;
-$$ LANGUAGE plpgsql;
-
-CREATE TRIGGER set_ctime_on_update
-BEFORE UPDATE ON usertitles
-FOR EACH ROW
-EXECUTE FUNCTION set_ctime();
+EXECUTE FUNCTION notify_new_signal();