Delete row ('1993', '20657') from daily_volatility

ticker_id 1993
day 20657
implied_open 1.011206151088887
implied_high 1.022318306595358
implied_low 0.9556453735565301
implied_close 1.00644379872897
historical_open 0.7921379425327385
historical_high 0.7921379425327385
historical_low 0.7921379425327385
historical_close 0.7921379425327385
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