Delete row ('2756', '20257') from daily_volatility

ticker_id 2756
day 20257
implied_open 0.1889066436100118
implied_high 0.2016062499031218
implied_low 0.1714446849569855
implied_close 0.174619586530263
historical_open 0.1571576278772367
historical_high 0.1571576278772367
historical_low 0.1571576278772367
historical_close 0.1571576278772367
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