Delete row ('6', '20507') from daily_volatility

ticker_id 6
day 20507
implied_open 1.268373178524365
implied_high 1.365207676509329
implied_low 1.268373178524365
implied_close 1.315996702123527
historical_open 1.173126131326039
historical_high 1.173126131326039
historical_low 1.173126131326039
historical_close 1.173126131326039
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