Delete row ('1481', '20138') from daily_volatility

ticker_id 1481
day 20138
implied_open 0.5048093501511239
implied_high 0.5143340548709564
implied_low 0.5000469977912076
implied_close 0.5016344485778464
historical_open 0.7937253933193773
historical_high 0.7937253933193773
historical_low 0.7937253933193773
historical_close 0.7937253933193773
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