Delete row ('1992', '20171') from daily_volatility

ticker_id 1992
day 20171
implied_open 0.6318054130822243
implied_high 0.6635544288149993
implied_low 0.5603701276834803
implied_close 0.6508548225218893
historical_open 0.8905598913043412
historical_high 0.8905598913043412
historical_low 0.8905598913043412
historical_close 0.8905598913043412
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