Delete row ('501', '20731') from daily_volatility

ticker_id 501
day 20731
implied_open 0.8778602850112313
implied_high 0.9350085133302264
implied_low 0.8000751964659323
implied_close 0.9016720468108126
historical_open 0.7730885330930735
historical_high 0.7730885330930735
historical_low 0.7730885330930735
historical_close 0.7730885330930735
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