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Marc-André Bombeck
bed6588699
On a completed sign-in (password, second-factor, or passkey) from a device or location not seen before, send one notification through the dispatcher cascade, honouring the user's per-channel preferences via a new SECURITY_ALERT event type. Dedupe on a one-way, per-user fingerprint: a SHA-256 over the userId, the coarse User-Agent family, and a country/ASN-level geo signal, stored in the new user_known_devices ledger (migration 0203). The first sighting of a fingerprint alerts and records; later sightings only bump last-seen and stay silent. The raw User-Agent and IP are never persisted — only the salted hash and a coarse label. Registration records its device silently so a fresh account does not alert on its own first session. The whole path is fire-and-forget and never blocks or fails a sign-in.