// Per-install browser identifier. Replaces the legacy per-device crypto
// identity for non-crypto bookkeeping (push tokens, message sender_device_id
// metadata) where we just need a stable, opaque id for this browser/install.
//
// The user-key model has no device-bound crypto; the `devices` table and
// `messages.sender_device_id` column still exist but they're now plain
// telemetry. Using a localStorage UUID keeps the column populated without
// any of the old key-management overhead.

const KEY = 'chatapp.installId';

export function ensureInstallId(): string {
  let id = window.localStorage.getItem(KEY);
  if (!id) {
    id = crypto.randomUUID();
    window.localStorage.setItem(KEY, id);
  }
  return id;
}