What Cairn stores

From Steam

When you sign in with Steam, Cairn receives your SteamID and public profile name and avatar — never your password, and never your email address. Steam's sign-in happens on Steam's own site.

With that SteamID it reads your owned games, playtime and last-played dates, and your wishlist. Both need your Steam profile's game details to be public; if they are private, Cairn sees an empty library and cannot do anything useful.

From you

• The mood vibes you attach to games, which is what the recommender learns from.
• Your slot definitions, active mix, session notes and manual length overrides.
• Each wizard run: the mood you set, what was suggested, and which game you opened. A launch also records the closest matching vibe as a suggestion — it does not affect your recommendations until you confirm it.
• Optionally a Telegram chat id, if you connect the release-alert bot.

Where it lives

One Postgres database hosted by Neon in the EU (Frankfurt), and the app itself on Vercel. Game metadata comes from the Steam Web API, IGDB and SteamSpy; those services see requests for games, not for you.

Your rows are yours: every query is scoped to your account, and no part of the app shows one person's library, tags or history to another.

Deleting it

Settings has a Delete account button. It removes your account and everything attached to it — library rows, tags, slots, sessions, wizard history, Telegram link — immediately and for good. Shared game metadata (covers, genres, release dates) stays, because it was never yours: it describes the games, not you.

What Cairn promises and expects in return is on the terms page.