Delete row ('543', '20151') from daily_volatility

ticker_id 543
day 20151
implied_open 0.6905410921878581
implied_high 0.7143528539874394
implied_low 0.6810163874680256
implied_close 0.6889536414012194
historical_open 0.6667293303882769
historical_high 0.6667293303882769
historical_low 0.6667293303882769
historical_close 0.6667293303882769
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