Richard,
Thanks for the response.
I'll look into both the dblink and iirc.
Do you know of any extended examples of either?
dblink is in the contrib/ folder of the source distribution and possibly your packaged version if you use such a thing. Never needed it myself, but the documentation looks clear enough.
As for listen/notify possibly dropping duplicate notifications... Ah! it's in the "SQL COMMANDS" reference part of the manuals
NOTIFY behaves like Unix signals in one important respect: if the same condition name is signaled multiple times in quick succession, recipients may get only one notify event for several executions of NOTIFY. So it is a bad idea to depend on the number of notifies received. Instead, use NOTIFY to wake up applications that need to pay attention to something, and use a database object (such as a sequence) to keep track of what happened or how many times it happened.
-- Richard Huxton Archonet Ltd
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
