Delete row ('1549', '20731') from daily_volatility

ticker_id 1549
day 20731
implied_open 0.6222807083623917
implied_high 0.7016532476943295
implied_low 0.6222807083623917
implied_close 0.6572046256684443
historical_open 0.4381364171122962
historical_high 0.4381364171122962
historical_low 0.4381364171122962
historical_close 0.4381364171122962
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