I noticed a few things that had to be changed.  function names with
exchangerate in them should be changed to exchange_rate.

Additionally I added a column to exchange_rate called post_date that is a
date field, and a primary key of (buy_curr, sell_curr, post_date).

This seems widely applicable, well beyond accounting apps, so thinking of
releasing it as a PostgreSQL extension under a BSD license (feedback on
that would be worthwhile as well).


-- 
Best Wishes,
Chris Travers

Efficito:  Hosted Accounting and ERP.  Robust and Flexible.  No vendor
lock-in.
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