Delete row ('1406', '20531') from daily_volatility

ticker_id 1406
day 20531
implied_open 0.2016062499031218
implied_high 0.2095435038363156
implied_low 0.2000187991164831
implied_close 0.2063686022630381
historical_open 0.1762070373169017
historical_high 0.1762070373169017
historical_low 0.1762070373169017
historical_close 0.1762070373169017
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