Delete row ('2766', '19970') from daily_volatility

ticker_id 2766
day 19970
implied_open 0.2111309546229543
implied_high 0.2206556593427869
implied_low 0.1952564467565668
implied_close 0.2047811514763993
historical_open 0.2746289860885045
historical_high 0.2746289860885045
historical_low 0.2746289860885045
historical_close 0.2746289860885045
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