Delete row ('2760', '20504') from daily_volatility

ticker_id 2760
day 20504
implied_open 0.1904940943966505
implied_high 0.1936689959699281
implied_low 0.1777944881035405
implied_close 0.1825568404634567
historical_open 0.1555701770905979
historical_high 0.1555701770905979
historical_low 0.1555701770905979
historical_close 0.1555701770905979
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