Delete row ('1856', '20698') from daily_volatility

ticker_id 1856
day 20698
implied_open 0.6873661906145806
implied_high 0.7794383362396284
implied_low 0.549257972177009
implied_close 0.6587920764550831
historical_open 0.8461112692784561
historical_high 0.8461112692784561
historical_low 0.8461112692784561
historical_close 0.8461112692784561
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