Delete row ('240', '20728') from daily_volatility

ticker_id 240
day 20728
implied_open 0.7349897142137433
implied_high 0.7572140252266859
implied_low 0.6905410921878581
implied_close 0.7222901079206332
historical_open 0.6921285429744969
historical_high 0.6921285429744969
historical_low 0.6921285429744969
historical_close 0.6921285429744969
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