Delete row ('1992', '20521') from daily_volatility

ticker_id 1992
day 20521
implied_open 0.542908169030454
implied_high 0.5651324800433966
implied_low 0.5175089564442339
implied_close 0.5222713088041502
historical_open 0.6683167811749156
historical_high 0.6683167811749156
historical_low 0.6683167811749156
historical_close 0.6683167811749156
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