Simply create a trigger which will insert unsubscribed users in the blacklist after every update on the subscriber table.
Sometimes a drupal theme can be broken and it can be needed to reset the default theme so the site can be accessed again in order to fix the problem.
As a rule of thumb I always try to use the theme "Cube" for the administrive part of drupal. that makes things a lot easier and if you breeak the theme you can at least still use the admin part.
Here is anyhow how to reset the theme using SQL:
Simply execute the three following commands:
UPDATE system SET status=1 WHERE name = 'garland';
If you are looking for the last SQL query ran by a specific process, try this:
select substr(sa.sql_text,1,1000) txt from v$process p, v$session s, v$sqlarea sa where p.addr=s.paddr and s.username is not null and s.sql_address=sa.address(+) and s.sql_hash_value=sa.hash_value(+) and spid=&SPID;