Delete row ('40', '20306') from daily_volatility

ticker_id 40
day 20306
implied_open 0.2920909447415308
implied_high 0.2920909447415308
implied_low 0.277803887661782
implied_close 0.2825662400216983
historical_open 0.2079560530496768
historical_high 0.2079560530496768
historical_low 0.2079560530496768
historical_close 0.2079560530496768
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