Delete row ('297', '20321') from daily_volatility

ticker_id 297
day 20321
implied_open 0.2270054624893419
implied_high 0.2397050687824519
implied_low 0.2270054624893419
implied_close 0.2333552656358969
historical_open 0.2047811514763993
historical_high 0.2047811514763993
historical_low 0.2047811514763993
historical_close 0.2047811514763993
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