Updating how deprecated exchanges are used

Today we have released a small update that changes how we select deprecated exchanges in calculating composite rates.

Previously, we would select any deprecated exchange for any exchange date – and, since we prefer direct exchange pairs like DOGE/EUR instead of going through DOGE/BTC and BTC/EUR, deprecated exchanges (particularly Vircurex, which is still running, but essentially deprecated) would be selected – causing reports and charts to sometimes be misleading.

With this change, we now only select deprecated exchanges if either (a) the exchange was not deprecated before the date of conversion, or (b) the exchange has been selected as one of your preferred exchanges.

This change will have little impact to most of our users, but should improve the quality of the reports for some more unusual situations.