Delete row ('2516', '20731') from daily_volatility

ticker_id 2516
day 20731
implied_open 0.4428987694722125
implied_high 0.7095905016275231
implied_low 0.2619293797953945
implied_close 0.7016532476943295
historical_open 0.2397050687824519
historical_high 0.2397050687824519
historical_low 0.2397050687824519
historical_close 0.2397050687824519
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