Delete row ('1990', '20731') from daily_volatility

ticker_id 1990
day 20731
implied_open 0.6968908953344132
implied_high 0.742926968146937
implied_low 0.6508548225218893
implied_close 0.730227361853827
historical_open 0.8445238184918173
historical_high 0.8445238184918173
historical_low 0.8445238184918173
historical_close 0.8445238184918173
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