Fireproof is a local-first, real-time document database with CRDT-based conflict resolution, end-to-end encryption, and multi-platform support (browser, Node.js, Deno, Cloudflare Workers). The monorepo contains the core database engine (`@fireproof/core`), a cloud sync backend (Hono + Durable Objects), a dashboard web application for tenant/ledger management, a CLI tool for build and DevOps tasks, and a React hooks library (`use-fireproof`). The architecture is modular with clear separation between storage gateways (IndexedDB, filesystem, memory, cloud), key management (KeyBag with fingerprinting), device identity (X.509-like PKI), and protocol layers (WebSocket/HTTP message dispatch). The codebase exhibits strong engineering practices including extensive TypeScript usage, comprehensive testing (though some tests are skipped or known to fail), and reusable patterns like the Gateway interceptor, Result type, and Evento command pipeline. However, complexity is high due to multiple runtime targets and active refactoring between versions, and there are known critical bugs (e.g., remote sync not triggering subscriptions in React hooks).