Utopia

Ships as a single statically-compiled binary. That one executable handles HTTP routing, database migrations, Binance WebSocket streams, Yahoo Finance polling, passkey ceremonies, and static file serving, with no interpreter or runtime required on the server. Cold starts sit under 10ms.

HTML templates that compile to typed Go functions rather than parsed strings. The practical upside is that structural errors and type mismatches are caught at build time, before anything reaches the browser. The UI is entirely server-rendered; the client receives plain HTML.

A tiny SSE-based reactivity library that enables live DOM updates without a JavaScript framework. Dashboard widgets refresh in real-time through server-sent events, client-side complexity stays minimal while the server retains full control.

All financial data is persisted in PostgreSQL with automatic schema migrations via golang-migrate. ACID transactions ensure integrity for every import and update. Indexed aggregation queries stay fast even across years of transaction history.

Passkeys are public-key credentials bound to the device; the private key never leaves it. The server stores only the public side, so there is nothing sensitive to protect on that end and nothing to reset or recover. Authentication follows the WebAuthn / FIDO2 standard throughout.

A persistent Binance WebSocket connection streams 1-second miniTicker events for every subscribed pair. Prices land in an in-memory store and are served to clients via a lightweight REST endpoint. The frontend aggregates raw prices into 10-second OHLC candles rendered with ECharts, including gap-fill from Binance Klines on page load.