Delete row ('6', '20460') from daily_volatility

ticker_id 6
day 20460
implied_open 0.9715198814229177
implied_high 0.9715198814229177
implied_low 0.911196751530645
implied_close 0.9334210625435876
historical_open 0.9508830211966139
historical_high 0.9508830211966139
historical_low 0.9508830211966139
historical_close 0.9508830211966139
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