Delete row ('507', '20731') from daily_volatility

ticker_id 507
day 20731
implied_open 1.023905757381997
implied_high 2.81613769549715
implied_low 1.023905757381997
implied_close 2.770101622684626
historical_open 0.6730791335348318
historical_high 0.6730791335348318
historical_low 0.6730791335348318
historical_close 0.6730791335348318
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