Delete row ('697', '20278') from daily_volatility

ticker_id 697
day 20278
implied_open 0.2587544782221169
implied_high 0.2587544782221169
implied_low 0.2365301672091744
implied_close 0.2508172242889232
historical_open 0.2127184054095931
historical_high 0.2127184054095931
historical_low 0.2127184054095931
historical_close 0.2127184054095931
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