Delete row ('1993', '20718') from daily_volatility

ticker_id 1993
day 20718
implied_open 0.6413301178020567
implied_high 0.730227361853827
implied_low 0.6381552162287792
implied_close 0.6572046256684443
historical_open 0.7842006885995447
historical_high 0.7842006885995447
historical_low 0.7842006885995447
historical_close 0.7842006885995447
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