Delete row ('2766', '20503') from daily_volatility

ticker_id 2766
day 20503
implied_open 0.2190682085561481
implied_high 0.2381176179958132
implied_low 0.2190682085561481
implied_close 0.2301803640626194
historical_open 0.1777944881035405
historical_high 0.1777944881035405
historical_low 0.1777944881035405
historical_close 0.1777944881035405
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