Delete row ('1992', '20131') from daily_volatility

ticker_id 1992
day 20131
implied_open 0.627043060722308
implied_high 0.6476799209486118
implied_low 0.5698948324033128
implied_close 0.6127560036425592
historical_open 0.8699230310780375
historical_high 0.8699230310780375
historical_low 0.8699230310780375
historical_close 0.8699230310780375
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