A type-safe builder for generating CRUD routes. It uses the `HasJsonPayload` trait to derive request/response types and automatically produces Axum route handlers with serialization, status codes, and error handling. This pattern eliminates boilerplate while maintaining compile-time correctness, and could be extracted to generate CRUD endpoints for any Axum+SQLx project.

An approval workflow service managing pending approvals with timeouts, shared future waiters, and broadcast patch streams. It uses a concurrent map of approval states and a background watcher for expired approvals. The design cleanly separates the approval lifecycle from the executor, and the streaming of approval state via JSON patches can be reused in any system requiring human-in-the-loop confirmations.

A generic signed WebSocket wrapper that works for both tungstenite and axum. It signs each WebSocket frame with Ed25519 or HMAC, providing authenticity without TLS overhead. The implementation is transport-agnostic and can be reused to secure WebSocket connections in any Rust project.

A `useShape` hook that subscribes to ElectricSQL shapes and provides optimistic insert/update/remove mutations. It manages local state with rollback on server rejection, handles shape pause/resume during authentication, and exposes a clean React hook API. This pattern is reusable for any real-time data sync scenario with Electric or similar sync engines.

A unified diff parser and transformer that converts raw diff output into a structured list of `DiffChange` entries (lines with before/after context). It correctly handles hunks, file headers, and metadata. This module is self-contained and can be extracted to parse diffs in any Rust application requiring structured diff representation.