Extension:Newsletter/nl_subscriptions table

mysql> describe nl_subscriptions;
+-------------------+---------+------+-----+---------+-------+
| Field             | Type    | Null | Key | Default | Extra |
+-------------------+---------+------+-----+---------+-------+
| nls_newsletter_id | int(11) | NO   | PRI | NULL    |       |
| nls_subscriber_id | int(11) | NO   | PRI | NULL    |       |
+-------------------+---------+------+-----+---------+-------+