Delete row ('6', '20615') from daily_volatility

ticker_id 6
day 20615
implied_open 1.466804526854209
implied_high 1.469979428427487
implied_low 1.362032774936051
implied_close 1.384257085948994
historical_open 1.498553542586984
historical_high 1.498553542586984
historical_low 1.498553542586984
historical_close 1.498553542586984
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