Delete row ('1512', '20748') from daily_volatility

ticker_id 1512
day 20748
implied_open 0.5889442418429779
implied_high 0.5889442418429779
implied_low 0.5381458166705377
implied_close 0.5778320863365066
historical_open 0.6572046256684443
historical_high 0.6572046256684443
historical_low 0.6572046256684443
historical_close 0.6572046256684443
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