unable to add or delete from table

[Craig Russell <craig(at)airdigitalnetwork(dot)com>]

I'm using a postgresql database as the back end for opennms.  Everything 
was running fine until I had to do some tuning a few weeks ago 
(basically deleting old nodes, unmanaging interfaces, etc.) I did all of 
this via the web ui that comes with opennms.  However, I discovered a 
couple of days ago that I am no longer able to add or delete nodes.  It 
appears that the node table is locked and nothing I have tried has 
allowed me to modify this table. I have been able to work with the other 
tables in the database just not the node table.

I am certainly not a sql expert but everything I have tried to date has 
failed.

The command that I am running to delete a node from the command line is 
as follows:

delete from node where nodeid=19;

This command just hangs at the command line and a ctrl-c jumps me out of 
it.  All that appears to be logged is a "query cancelled by user".

I have tried reindexing the table, running a vacuum on the table and the 
database, all to no avail.  I am able to run similar commands on other 
tables to delete unwanted rows.

Any ideas on what I am missing here?

Thanks,

Craig Russell