I have an `ALTER TABLE` statement that according to `pg_stat` is "waiting", and I'm wondering if there is an easy fix to allow the statement to execute? 

From my limited understanding I think it's a table level lock that isn't releasing. The table `pg_locks` shows a single `AccessExclusiveLock` that has its granted column set to `f`. Running `ps aux | grep postgres` confirms that there is a postgres `ALTER TABLE` waiting. 

If it helps the statement is one that's been created by the Django ORM (South in particular).

Thanks.