Delete row ('15', '20735') from daily_volatility

ticker_id 15
day 20735
implied_open 0.4413113186855737
implied_high 0.4444862202588513
implied_low 0.4301991631791025
implied_close 0.4413113186855737
historical_open 0.3286023128342221
historical_high 0.3286023128342221
historical_low 0.3286023128342221
historical_close 0.3286023128342221
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