Rats Search is a decentralized BitTorrent search engine implemented as a Qt6/C++ desktop application with a headless server mode. It crawls the BitTorrent DHT network to discover torrent metadata, indexes it using Manticore Search (a Sphinx-compatible full-text database), and provides a full-featured GUI for searching, downloading, and managing torrents. The application also includes a P2P replication layer for synchronizing databases between peers, a REST/WebSocket API for remote control, and support for torrent creation, seeding, and metadata export. The codebase is well-layered (domain, data, services, net, ui, rest) with clear separation of concerns, extensive unit and integration tests (15+ test files), and a professional CMake build system with CI for Windows, macOS, and Linux. A legacy Electron/Node.js version (v1.x) is preserved in the `legacy/` directory but is not actively developed. The project demonstrates high craftsmanship in its data layer (hash-based row IDs, safe SphinxQL query builders, resumable database dumps) and service architecture (cancel tokens, progress reporting, event-driven updates via Qt signals). However, the main window (`mainwindow.cpp`) exceeds 2400 lines, and the presence of the legacy codebase adds maintenance overhead.