Delete row ('331', '20131') from daily_volatility

ticker_id 331
day 20131
implied_open 0.9413583164767814
implied_high 0.9572328243431689
implied_low 0.9365959641168651
implied_close 0.9524704719832526
historical_open 1.01914340502208
historical_high 1.01914340502208
historical_low 1.01914340502208
historical_close 1.01914340502208
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