Self-hosted n8n has a failure mode almost everyone hits eventually: everything runs fine for months, then one day the editor won't load, webhooks time out, and workflows silently stop. It's rarely a mystery when you dig in — it's almost always one of two things: Single-instance execution. By default, n8n executes workflows in the same process that serves the UI and receives webhooks. One heavy execution (a big loop, an AI agent chain, a large file) and everything else starves. The un...