Delete row ('1961', '20256') from daily_volatility

ticker_id 1961
day 20256
implied_open 0.168269783383708
implied_high 0.1762070373169017
implied_low 0.1666823325970692
implied_close 0.174619586530263
historical_open 0.1460454723707654
historical_high 0.1460454723707654
historical_low 0.1460454723707654
historical_close 0.1460454723707654
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