Delete row ('12', '20418') from daily_volatility

ticker_id 12
day 20418
implied_open 0.2412925195690907
implied_high 0.2412925195690907
implied_low 0.2238305609160644
implied_close 0.2270054624893419
historical_open 0.2254180117027031
historical_high 0.2254180117027031
historical_low 0.2254180117027031
historical_close 0.2254180117027031
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