Delete row ('697', '20040') from daily_volatility

ticker_id 697
day 20040
implied_open 0.180969389676818
implied_high 0.1841442912500955
implied_low 0.1793819388901792
implied_close 0.180969389676818
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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