Delete row ('71', '20731') from daily_volatility

ticker_id 71
day 20731
implied_open 0.2206556593427869
implied_high 0.2206556593427869
implied_low 0.2047811514763993
implied_close 0.2143058561962319
historical_open 0.1381082184375716
historical_high 0.1381082184375716
historical_low 0.1381082184375716
historical_close 0.1381082184375716
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