beginners postgres question

[graham]

This is a postgres question more than a perl one (ergo, on-topic, I hope)

I just started using postgres being only used to mysql.

I used dia and tedia2sql to generate my original db design.

The db now contains a huge amount of data.

I now need to add some new tables to the design. Rather than altering 
the live db and risking getting out of sync with the documentation, I 
dumped the data with pg_dump, generated the new schema from tedia2sql, 
recreated the empty database with the new tables and.... WTF?

At this point I discover that pg_dump produces dump files which cannot 
be reloaded, since they take no account of dependencies. For example, I 
have a lot of join tables, which necessarily depend on foreign keys from 
other tables. But pg_dump produces output with these tables BEFORE the 
ones the keys come from.

Googling shows sporadic complaints about this problem from the beginning 
  of the millenium. Searching CPAN gives me no modules which are either 
alternatives to pg_dump or which postprocess the files to fix it.

But dumping/reloading data is a basic function for a database which is 
sworn by (not at) by many members of this list, so I'm missing something 
obvious[1]. What?

Thanks
Graham

[1] I'm not including manually editing a huge dump file