Oracle just wrapped up its worst week on Wall Street in 25 years as concerns continue to mount about the software company's debt load and whether its bet-the-house investment on artificial intelligence will pay off. The stock plummeted 19% this week, dropping at least 2.6% each of the past five days. It's the steepest weekly drop since a 20% plunge in August 2001, during the depths of the dot-com bust. The past nine months have been brutal for Oracle investors. After the company reached a peak