Delete row ('1876', '20571') from daily_volatility

ticker_id 1876
day 20571
implied_open 0.5508454229636478
implied_high 0.5698948324033128
implied_low 0.5349709150972602
implied_close 0.5365583658838989
historical_open 0.5778320863365066
historical_high 0.5778320863365066
historical_low 0.5778320863365066
historical_close 0.5778320863365066
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