Delete row ('1992', '20528') from daily_volatility

ticker_id 1992
day 20528
implied_open 0.5111591532976789
implied_high 0.5175089564442339
implied_low 0.4857599407114588
implied_close 0.4952846454312914
historical_open 0.6587920764550831
historical_high 0.6587920764550831
historical_low 0.6587920764550831
historical_close 0.6587920764550831
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