Got it running with sentry and plausible and stuff. Auth seems good

src/instrumentation-client.ts

@@ -0,0 +1,16 @@
+// https://docs.sentry.io/platforms/javascript/guides/nextjs/
+import * as Sentry from '@sentry/nextjs';
+
+Sentry.init({
+  dsn: process.env.NEXT_PUBLIC_SENTRY_DSN!,
+  // https://docs.sentry.io/platforms/javascript/guides/nextjs/configuration/options/#sendDefaultPii
+  sendDefaultPii: true,
+  // https://docs.sentry.io/platforms/javascript/configuration/options/#traces-sample-rate
+  tracesSampleRate: 1.0,
+  integrations: [Sentry.replayIntegration()],
+  // https://docs.sentry.io/platforms/javascript/session-replay/configuration/#general-integration-configuration
+  replaysSessionSampleRate: 0.1,
+  replaysOnErrorSampleRate: 1.0,
+});
+// `captureRouterTransitionStart` is available from SDK version 9.12.0 onwards
+export const onRouterTransitionStart = Sentry.captureRouterTransitionStart;