Delete row ('247', '20731') from daily_volatility

ticker_id 247
day 20731
implied_open 0.090484694838409
implied_high 0.1111215550647128
implied_low 0.0301615649461363
implied_close 0.0349239173060526
historical_open 0.0301615649461363
historical_high 0.0301615649461363
historical_low 0.0301615649461363
historical_close 0.0301615649461363
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