What's the diagram you keep redrawing?

Every team I've worked on had one: the architecture diagram that was right once, then quietly went stale. OpenFlowKit 2 goes live today, and it's built around keeping that one diagram current: you draw it or write it as code, your AI assistant proposes changes, your coding agent edits it over MCP.

What's yours? The system diagram, the onboarding flow, the database schema? I'd love to try the new version against real cases.