MiSub is a comprehensive subscription management tool for proxy/VPN services built with Vue 3 frontend and Cloudflare Pages Functions backend. It allows users to aggregate multiple subscription links, apply transformations (filtering, renaming, deduplication, sorting), and generate configuration files for various proxy clients (Clash, Sing-Box, Surge, Loon, QuanX, Egern). The application features a web interface for managing subscriptions, manual nodes, and profiles, backup/restore functionality (WebDAV/local), Telegram notifications, and an External Management API for programmatic control. The architecture follows a modular design with clear separation between frontend (Vue 3/Pinia/Vue Router), backend (Cloudflare Pages Functions), and storage (KV/D1 abstraction layer). Key innovations include visual operator chains for node processing, template-based configuration generation, and sophisticated caching mechanisms.