Delete row ('2208', '20731') from daily_volatility

ticker_id 2208
day 20731
implied_open 0.0396862696659689
implied_high 0.090484694838409
implied_low 0.0253992125862201
implied_close 0.0269866633728588
historical_open 0.0301615649461363
historical_high 0.0301615649461363
historical_low 0.0301615649461363
historical_close 0.0301615649461363
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