Delete row ('2770', '20207') from daily_volatility

ticker_id 2770
day 20207
implied_open 0.2793913384484208
implied_high 0.2873285923816146
implied_low 0.2635168305820332
implied_close 0.2698666337285883
historical_open 0.3778132872200236
historical_high 0.3778132872200236
historical_low 0.3778132872200236
historical_close 0.3778132872200236
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