Cry Tracker

Problem

I wanted a small, honest personal tracker — one tap to log a cry, then enough structure on top to actually see a pattern. How big was it, was it a happy or a sad cry, what set it off, and the occasional note. The point was never the data entry; it was the payoff: a mood breakdown, a size distribution, the recurring triggers, and a streak. It only ever needs to serve one person, so the real constraint was keeping the whole thing tiny and cheap to run while still being a real app — authenticated, persistent, and deployed — rather than a toy that lives in localStorage.

Approach

It's an npm-workspaces monorepo with two halves: a Svelte 5 SPA for the UI and a Hono API on Cloudflare Workers backed by Cloudflare D1 (SQLite) for everything else. The SPA ships as a static bundle; all state lives in D1 behind the Worker, and the only thing the browser persists is a bearer token in localStorage.

• PIN gate, not accounts. Single-user means the auth can be a numeric PIN exchanged for a session token, with per-IP rate limiting (5 attempts / 15 min) backed by an auth_attempts table. The PIN lives in a Worker secret binding, never in committed source — the test suite uses its own fixed test-only PIN.
• Data the app can reshape. The selectable label lists — sizes, valences, triggers — aren't hardcoded enums. They live in a config table and are editable in Settings, so the vocabulary of the app is itself data.
• Stats as the product. The cries table is deliberately flat (no foreign keys), which keeps the aggregation queries — mood split, size distribution, trigger frequency, streaks — simple and fast.

Result

The outcome is a complete, deployed app that does exactly one thing well and costs almost nothing to keep running: a static Svelte front end and a Hono Worker on Cloudflare's free tier. The API surface is small and fully covered by integration tests using @cloudflare/vitest-pool-workers — auth, the cries CRUD flow, and config — so the contract is verified against a real Workers runtime rather than mocked. Auth is rate-limited and secrets stay out of the repo, and the label lists are user-editable, so the app bends to how its one user actually thinks about crying instead of forcing them into my categories.