Delete row ('297', '20140') from daily_volatility

ticker_id 297
day 20140
implied_open 0.2190682085561481
implied_high 0.2428799703557294
implied_low 0.2158933069828706
implied_close 0.2397050687824519
historical_open 0.2301803640626194
historical_high 0.2301803640626194
historical_low 0.2301803640626194
historical_close 0.2301803640626194
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