Delete row ('510', '20271') from daily_volatility

ticker_id 510
day 20271
implied_open 0.4825850391381813
implied_high 0.4905222930713751
implied_low 0.4667105312717938
implied_close 0.4762352359916263
historical_open 0.4682979820584325
historical_high 0.4682979820584325
historical_low 0.4682979820584325
historical_close 0.4682979820584325
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