Delete row ('1992', '20160') from daily_volatility

ticker_id 1992
day 20160
implied_open 0.7667387299465185
implied_high 0.8492861708517336
implied_low 0.7318148126404658
implied_close 0.7603889267999634
historical_open 1.068354379407882
historical_high 1.068354379407882
historical_low 1.068354379407882
historical_close 1.068354379407882
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