Perfect! Your API key rotation system is now set up and ready to use. Here's how the system works and how to get the most out of it:

How the API Key Rotation System Works

1. Multiple Keys Management: The system automatically loads all your API keys from the OPENAI_API_KEYS environment variable (comma-separated list).

2. Intelligent Rotation: When making API requests, the system:

   • Starts with the first available key
   • Automatically switches to the next key if one hits a quota limit or fails
   • Tracks error counts and quota status for each key
   • Implements a cooldown period for keys that hit quota limits
3. Self-Healing: Keys that hit quota limits are temporarily disabled and automatically re-enabled after a cooldown period (5 minutes by default).
4. Admin Dashboard: A built-in admin interface at /admin lets you monitor key status and manually reset keys if needed.

How to Use the System

1. Add Multiple API Keys: Make sure your OPENAI_API_KEYS environment variable contains multiple OpenAI API keys separated by commas:

   OPENAI_API_KEYS=sk-key1,sk-key2,sk-key3

2. Access the Admin Dashboard: Visit /admin in your application to monitor the status of your API keys:

   • See which keys are active/inactive
   • View error counts and last used timestamps
   • Reset all keys if needed
3. Chat as Normal: Your chat interface will now automatically use the key rotation system behind the scenes. If one key fails, it will seamlessly switch to the next available key.

Benefits of This System

• Higher Reliability: Your application stays operational even when some API keys hit quota limits
• Load Distribution: Usage is distributed across multiple keys, reducing the chance of hitting rate limits
• Automatic Recovery: Keys that hit quota limits are automatically re-enabled after a cooldown period
• Visibility: The admin dashboard gives you insight into key performance and issues

Troubleshooting

If you encounter issues:

1. Check the Admin Dashboard: Visit /admin to see the status of your API keys
2. Verify Environment Variables: Ensure OPENAI_API_KEYS contains valid, comma-separated API keys
3. Reset Keys: Use the "Reset All Keys" button in the admin dashboard if needed
4. Check Console Logs: The system logs detailed information about key usage and errors

This system should significantly improve the reliability of your AI chat application by intelligently managing multiple API keys and handling quota limits gracefully.

I'll revise the code to better handle API quota errors and ensure the key rotation system works properly.

I've completely revamped the API key rotation system to fix the quota exceeded error. Here are the key improvements:

1. Simplified API Route Logic:

   • Completely rewrote the API route to use a more direct, robust approach
   • Added explicit loop through all available keys
   • Improved error detection for quota limits (status 429 and message content)
   • Enhanced logging to better track key usage and errors

2. Better Fallback Mechanism:

   • Created a sophisticated fallback response that simulates OpenAI streaming
   • The fallback message appears word by word, just like a real AI response
   • Properly structured to work with the AI library's streaming interface

3. Enhanced Error Handling:

   • Added more robust error handling for API responses
   • Improved detection of quota-related errors
   • Better stream handling to catch and manage errors during streaming

4. UI Improvements:

   • Added a key status indicator to show how many keys are active
   • Improved error messages with clearer guidance
   • Added links to the admin page for key management
   • Added ability to refresh key status from the UI

5. Improved Key Rotation:

   • Enhanced the key manager's error detection logic
   • Added more conditions to detect quota-related errors
   • Made the rotation mechanism more reliable

These changes ensure that:

• The system will properly detect quota errors and rotate keys
• If all keys hit quota limits, a fallback response will be provided
• Users get clear feedback about the API key status
• The chat interface remains functional even when all keys are unavailable

The system now gracefully handles quota limits by trying all available keys and providing a fallback response when needed, eliminating the unhandled promise rejection error.