Delete row ('2764', '20521') from daily_volatility

ticker_id 2764
day 20521
implied_open 0.2047811514763993
implied_high 0.2301803640626194
implied_low 0.2016062499031218
implied_close 0.2031937006897606
historical_open 0.1857317420367343
historical_high 0.1857317420367343
historical_low 0.1857317420367343
historical_close 0.1857317420367343
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