Delete row ('12', '20157') from daily_volatility

ticker_id 12
day 20157
implied_open 0.2254180117027031
implied_high 0.2571670274354782
implied_low 0.2254180117027031
implied_close 0.2508172242889232
historical_open 0.2968532971014471
historical_high 0.2968532971014471
historical_low 0.2968532971014471
historical_close 0.2968532971014471
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