Delete row ('697', '20504') from daily_volatility

ticker_id 697
day 20504
implied_open 0.2730415353018658
implied_high 0.2746289860885045
implied_low 0.2619293797953945
implied_close 0.2635168305820332
historical_open 0.2190682085561481
historical_high 0.2190682085561481
historical_low 0.2190682085561481
historical_close 0.2190682085561481
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