Delete row ('615', '20391') from daily_volatility

ticker_id 615
day 20391
implied_open 0.2047811514763993
implied_high 0.2095435038363156
implied_low 0.1984313483298443
implied_close 0.2016062499031218
historical_open 0.1777944881035405
historical_high 0.1777944881035405
historical_low 0.1777944881035405
historical_close 0.1777944881035405
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