Delete row ('697', '20271') from daily_volatility

ticker_id 697
day 20271
implied_open 0.2333552656358969
implied_high 0.2428799703557294
implied_low 0.2063686022630381
implied_close 0.2381176179958132
historical_open 0.2111309546229543
historical_high 0.2111309546229543
historical_low 0.2111309546229543
historical_close 0.2111309546229543
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