Delete row ('40', '20511') from daily_volatility

ticker_id 40
day 20511
implied_open 0.5190964072308727
implied_high 0.5556077753235641
implied_low 0.5190964072308727
implied_close 0.530208562737344
historical_open 0.4778226867782651
historical_high 0.4778226867782651
historical_low 0.4778226867782651
historical_close 0.4778226867782651
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