Delete row ('615', '20738') from daily_volatility

ticker_id 615
day 20738
implied_open 0.1841442912500955
implied_high 0.1904940943966505
implied_low 0.1730321357436242
implied_close 0.1825568404634567
historical_open 0.168269783383708
historical_high 0.168269783383708
historical_low 0.168269783383708
historical_close 0.168269783383708
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