Delete row ('9', '20172') from daily_volatility

ticker_id 9
day 20172
implied_open 0.2397050687824519
implied_high 0.2397050687824519
implied_low 0.2285929132759806
implied_close 0.2301803640626194
historical_open 0.2857411415949758
historical_high 0.2857411415949758
historical_low 0.2857411415949758
historical_close 0.2857411415949758
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