Delete row ('21', '20728') from daily_volatility

ticker_id 21
day 20728
implied_open 0.3174901573277509
implied_high 0.3270148620475834
implied_low 0.3111403541811958
implied_close 0.3143152557544734
historical_open 0.2397050687824519
historical_high 0.2397050687824519
historical_low 0.2397050687824519
historical_close 0.2397050687824519
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