Rebrandly

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Build me a branded link shortener I run myself.

STACK
- Node with Fastify, SQLite via better-sqlite3, Caddy in front for automatic TLS
- One process, one file, deployable to a small VPS

THE REDIRECT
- GET /:slug looks up the target and returns 301 for permanent links, 302 for ones marked temporary
- Answer in under 10ms: keep the whole map in memory, refreshed on write
- Unknown slug returns your own 404 page, never a stack trace

CREATING LINKS
- Slug is generated as seven URL-safe characters, or supplied by hand and checked for collisions
- Reserve a list of words that must never become slugs: admin, api, login, static
- Optional expiry date, after which the link 410s rather than 404s

TRACKING
- One row per click: slug, referrer host, country from a local GeoIP database, coarse device bucket, timestamp
- Never store an IP; store an HMAC of it with a secret salt for unique counting
- Bots identified by user agent are recorded and flagged, not dropped

UTM DEFAULTS
- A workspace-level template applied to every link unless overridden per link
- Show the final URL before saving, so nobody discovers a broken parameter after posting

DOMAINS
- Multiple hostnames served by one instance, each with its own default UTM template
- Document the DNS records and let Caddy handle the certificates

Include a README on the redirect latency budget, the backup of the SQLite file, and what happens to links if the process restarts.