Delete row ('615', '20557') from daily_volatility

ticker_id 615
day 20557
implied_open 0.2095435038363156
implied_high 0.2127184054095931
implied_low 0.2000187991164831
implied_close 0.2016062499031218
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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