Delete row ('820', '20731') from daily_volatility

ticker_id 820
day 20731
implied_open 0.9683449798496402
implied_high 1.189000639192427
implied_low 0.8334116629853461
implied_close 0.8572234247849274
historical_open 0.7095905016275231
historical_high 0.7095905016275231
historical_low 0.7095905016275231
historical_close 0.7095905016275231
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