Delete row ('40', '20171') from daily_volatility

ticker_id 40
day 20171
implied_open 0.2301803640626194
implied_high 0.2381176179958132
implied_low 0.2206556593427869
implied_close 0.2222431101294256
historical_open 0.3730509348601073
historical_high 0.3730509348601073
historical_low 0.3730509348601073
historical_close 0.3730509348601073
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