Delete row ('697', '20256') from daily_volatility

ticker_id 697
day 20256
implied_open 0.2333552656358969
implied_high 0.2666917321553107
implied_low 0.2333552656358969
implied_close 0.2635168305820332
historical_open 0.2301803640626194
historical_high 0.2301803640626194
historical_low 0.2301803640626194
historical_close 0.2301803640626194
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