Replication of a small portion of data to another database

Hi there,
[I sent this email to pgsql-general yesterday, but it seems to be horked and 
this looks like the next best place]  
I have a set of structually identical databases which are functionally 
independant.

However, I now want to be able to do a full text index search on a single (two 
field) record across all of these databases. At the moment I only have a few 
of these databases and connecting to and scanning each one sequentially is 
sufficient. In the long term I expect the number of databases that will exist 
to make this unfeasable.

Thus I'd like to create a centralised database whose sole task is to enable 
full text searches of this record across all the other databases.  
I believe that Postgres doesn't do cross-database stuff as it stands.  
I currently have this harebrained scheme whereby I write my own SQL function 
in C that links to libpq so that any of the other databases can connect to the 
central DB and perform the required insert/update/delete when triggered to do 
so.  
Does that seem to be a reasonable thing to try? Has anyone else done such a
thing? Is there a better way of doing it?  
Paul.

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