Update faq.mdx

Added a section about 500: `bad_database_response` errors

Author: UrsaPolarisRecords

website/src/pages/en/token-api/faq.mdx

@@ -76,6 +76,10 @@ You can find the code for the MCP client in [The Graph's repo](https://github.co
 
 Check that you included the `Authorization: Bearer <jwt>` header with the correct, non-expired token. Common issues include using the API key instead of generating a new JWT, forgetting the "Bearer" prefix, using an incorrect token, or omitting the header entirely. Ensure you copied the JWT exactly as provided by The Graph Market.
 
+### Why am I getting 500 errors?
+
+Networks that are currently or temporarily unavailable on a given endpoint will return a `bad_database_response`, `Endpoint is currently not supported for this network` error. Databases that are in the process of ingestion will produce this response.
+
 ### Are there rate limits or usage costs?
 
 During Beta, the Token API is free for authorized developers. There are no specific rate limits, but reasonable throttling exists to prevent abuse. High request volumes may trigger HTTP 429 errors. Monitor official announcements for future pricing changes after Beta.