Delete row ('40', '20503') from daily_volatility

ticker_id 40
day 20503
implied_open 0.5175089564442339
implied_high 0.5460830706037315
implied_low 0.5159215056575952
implied_close 0.5190964072308727
historical_open 0.4476611218321287
historical_high 0.4476611218321287
historical_low 0.4476611218321287
historical_close 0.4476611218321287
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