Delete row ('2530', '20731') from daily_volatility

ticker_id 2530
day 20731
implied_open 0.8429363677051787
implied_high 0.8556359739982887
implied_low 0.8270618598387911
implied_close 0.8286493106254299
historical_open 0.7016532476943295
historical_high 0.7016532476943295
historical_low 0.7016532476943295
historical_close 0.7016532476943295
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