Delete row ('1992', '20180') from daily_volatility

ticker_id 1992
day 20180
implied_open 0.6905410921878581
implied_high 0.7254650094939107
implied_low 0.633392863868863
implied_close 0.6794289366813868
historical_open 0.9000845960241738
historical_high 0.9000845960241738
historical_low 0.9000845960241738
historical_close 0.9000845960241738
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