Delete row ('2350', '20515') from daily_volatility

ticker_id 2350
day 20515
implied_open 0.1650948818104304
implied_high 0.2206556593427869
implied_low 0.1650948818104304
implied_close 0.1841442912500955
historical_open 0.1508078247306817
historical_high 0.1508078247306817
historical_low 0.1508078247306817
historical_close 0.1508078247306817
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