Delete row ('2756', '20531') from daily_volatility

ticker_id 2756
day 20531
implied_open 0.2555795766488395
implied_high 0.2746289860885045
implied_low 0.2333552656358969
implied_close 0.2397050687824519
historical_open 0.2254180117027031
historical_high 0.2254180117027031
historical_low 0.2254180117027031
historical_close 0.2254180117027031
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