Delete row ('211', '19970') from daily_volatility

ticker_id 211
day 19970
implied_open 0.6476799209486118
implied_high 0.7524516728667696
implied_low 0.5968814957761717
implied_close 0.639742667015418
historical_open 0.9905692908625827
historical_high 0.9905692908625827
historical_low 0.9905692908625827
historical_close 0.9905692908625827
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