General
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New message informing clients when system is in Maintenance Mode ({"jsonrpc":"2.0","error":{"message":"system_maintenance","code":11051}})
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Market Maker Protection: New MMP flag in WS responses and event notifications 'mmp_cancelled' when an order was cancelled due to MMP triggering MMP. For FIX this mechanism already existed. 9008 DeribitMMProtection"Y" is removed from "cancel" ExceutionReport if the order was cancelled for some other reason than MMP.
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We have removed market order functionality from the web UI for options to protect clients from executions too far away from the Mark Price (market orders via API still possible).
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Adjustment of Estimated Liquidation price will now return 999,999.99 instead of 99,9999.99 for very high or infinite liquidation values.
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We have removed order query ability for closed orders older than 2 days. All open orders regardless of when they were initiated will remain visible.