Delete row ('1571', '20391') from daily_volatility

ticker_id 1571
day 20391
implied_open 0.2222431101294256
implied_high 0.2285929132759806
implied_low 0.2222431101294256
implied_close 0.2238305609160644
historical_open 0.1412831200108491
historical_high 0.1412831200108491
historical_low 0.1412831200108491
historical_close 0.1412831200108491
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