becasue of this upgrade, we will get a wrong margin call price for each debt from the old api.
based on the BSIP, witness should protect black swan for CNY and USD, so they should give a feed price 10USD/BTS and 10CNY/BTS
this will destroy exist bitCNY and bitUSD, make it only worth around 0.1 FIAT CNY.
the godd thing is seems only gdex-witness run the black swan protect logic, we have avoid from this disaster.