Hi! I'm trying to use the REST API to create knowledge base articles but every POST to https://api.charla.com/v1/kb/articles returns 502 Bad Gateway from nginx. My API key works (I can authenticate), and I'm sending the correct JSON payload as per your docs. Can you check if there's an issue with the /kb/articles endpoint? Reference Session ID from earlier failed attempts: 019dd4ff-45c4-7816-a986-41b93c604751