Delete row ('1992', '20207') from daily_volatility

ticker_id 1992
day 20207
implied_open 0.89214734209098
implied_high 0.8969096944508963
implied_low 0.86674812950476
implied_close 0.8683355802913987
historical_open 0.9619951767030852
historical_high 0.9619951767030852
historical_low 0.9619951767030852
historical_close 0.9619951767030852
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