Delete row ('6', '20418') from daily_volatility

ticker_id 6
day 20418
implied_open 0.9873943892893052
implied_high 0.9969190940091377
implied_low 0.9127842023172839
implied_close 0.9588202751298077
historical_open 1.196937893125621
historical_high 1.196937893125621
historical_low 1.196937893125621
historical_close 1.196937893125621
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