Delete row ('1556', '20731') from daily_volatility

ticker_id 1556
day 20731
implied_open 0.5619575784701191
implied_high 0.5778320863365066
implied_low 0.5111591532976789
implied_close 0.5540203245369253
historical_open 0.7032406984809682
historical_high 0.7032406984809682
historical_low 0.7032406984809682
historical_close 0.7032406984809682
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