$stamp = date('Ymd000000');
$like = date('%-m-d', time() + 7 * 24*60*60);
+XDB::execute("DELETE FROM watch_ops
+ WHERE cid = 4 AND date < CURDATE()");
+
XDB::execute("INSERT INTO watch_ops (uid, cid, known, date)
SELECT user_id, 4, $stamp, '$date'
FROM auth_user_md5