Delete row ('189', '20721') from daily_volatility

ticker_id 189
day 20721
implied_open 0.9223089070371163
implied_high 0.9556453735565301
implied_low 0.8286493106254299
implied_close 0.9032594975974513
historical_open 0.6968908953344132
historical_high 0.6968908953344132
historical_low 0.6968908953344132
historical_close 0.6968908953344132
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