Mantrae is a self-hosted web UI for managing Traefik dynamic configuration, including routers, services, middlewares, entry points, and server transports. The backend is written in Go using ConnectRPC/protobuf for the API layer, sqlc-generated code for SQLite persistence, and a Svelte frontend for the user interface. It provides CRUD and operational workflows for Traefik resources, DNS providers, users, agents, backups, and profiles. The README explicitly states that development has moved to Tether, making this project superseded. The codebase is a monorepo with large amounts of generated protobuf and sqlc code committed alongside hand-written service logic. It uses modern tooling such as buf, sqlc, goreleaser, and ko, but has no visible tests, some incomplete documentation, and a minimal OpenAPI spec. The UI includes generic data table components with sorting, filtering, pagination, and bulk actions. Overall, it is a functional but unremarkable application with moderate maintainability and limited reuse potential outside its own architecture.