Delete row ('1897', '20731') from daily_volatility

ticker_id 1897
day 20731
implied_open 0.3333646651941384
implied_high 0.3333646651941384
implied_low 0.2873285923816146
implied_close 0.2889160431682533
historical_open 0.2111309546229543
historical_high 0.2111309546229543
historical_low 0.2111309546229543
historical_close 0.2111309546229543
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