Delete row ('2717', '20517') from daily_volatility

ticker_id 2717
day 20517
implied_open 0.265104281368672
implied_high 0.3095529033945571
implied_low 0.2000187991164831
implied_close 0.2952658463148083
historical_open 0.265104281368672
historical_high 0.265104281368672
historical_low 0.265104281368672
historical_close 0.265104281368672
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