Delete row ('1993', '20664') from daily_volatility

ticker_id 1993
day 20664
implied_open 1.020730855808719
implied_high 1.071529280981159
implied_low 0.9270712593970326
implied_close 0.9715198814229177
historical_open 0.7842006885995447
historical_high 0.7842006885995447
historical_low 0.7842006885995447
historical_close 0.7842006885995447
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