Store Terms version alongside acceptance timestamp

Reviewer's follow-up: it's not enough to record when a user accepted
the Terms; we also need to record which version of the text they saw.

Changes:
- journal.users gains a nullable `terms_version` text column (nullable
  so the three pre-existing users without a version are kept as-is).
- New apps/journal/app/lib/legal.ts exports TERMS_VERSION as a single
  source of truth, reused by the legal pages' "Last updated" header
  and by the registration flow as the value to send/store.
- Registration form posts `termsVersion` alongside `termsAccepted` on
  all three relevant steps (start, finish, register-magic-link).
- API route validates that `termsVersion` is a non-empty string on
  any step that requires terms, and forwards it to the auth server.
- auth.server finishRegistration and registerWithMagicLink now take
  `termsVersion` and persist it on the users row.
- journal-auth spec gets a new scenario for version storage and a
  rejection scenario for missing version.

PRIVACY_LAST_UPDATED is also exported from the same module and used
by the Privacy page header, keeping both pages on a single legal.ts
source of truth for "last updated" labels. Privacy is not per-user
stored — it's informational, not contract.

Existing users have NULL terms_version; if we ever prompt them to
re-accept updated Terms, we can backfill with the version they
re-accept at that point.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/journal/app/lib/auth.server.ts

@@ -53,6 +53,7 @@ export async function finishRegistration(
   username: string,
   response: RegistrationResponseJSON,
   challenge: string,
+  termsVersion: string,
 ) {
   const db = getDb();
 
@@ -77,6 +78,7 @@ export async function finishRegistration(
     username,
     domain,
     termsAcceptedAt: new Date(),
+    termsVersion,
   });
 
   await db.insert(credentials).values({
@@ -147,7 +149,11 @@ export async function addPasskeyFinish(
 
 // --- Registration via Magic Link (no passkey) ---
 
-export async function registerWithMagicLink(email: string, username: string): Promise<string> {
+export async function registerWithMagicLink(
+  email: string,
+  username: string,
+  termsVersion: string,
+): Promise<string> {
   const db = getDb();
 
   const [existingEmail] = await db.select().from(users).where(eq(users.email, email));
@@ -159,7 +165,14 @@ export async function registerWithMagicLink(email: string, username: string): Pr
   const userId = randomUUID();
   const domain = process.env.DOMAIN ?? "localhost";
 
-  await db.insert(users).values({ id: userId, email, username, domain, termsAcceptedAt: new Date() });
+  await db.insert(users).values({
+    id: userId,
+    email,
+    username,
+    domain,
+    termsAcceptedAt: new Date(),
+    termsVersion,
+  });
 
   // Create magic token for verification
   const token = randomBytes(32).toString("base64url");

apps/journal/app/lib/legal.ts

@@ -0,0 +1,19 @@
+/**
+ * Version identifier for the currently-published Terms of Service.
+ *
+ * Stored on `users.terms_version` when a user accepts the Terms at
+ * registration. Bump this string whenever the Terms text changes in a way
+ * that warrants a re-acceptance — typically on each legal-review update.
+ *
+ * Kept as a plain date string (the "Last updated" date shown on the Terms
+ * page itself) so spec, storage, and UI stay in lockstep without a separate
+ * versioning scheme.
+ */
+export const TERMS_VERSION = "2026-04-19";
+
+/**
+ * "Last updated" date shown on the Privacy Policy. Privacy changes don't
+ * require re-acceptance (the policy is informational, not contract), so this
+ * is display-only — not persisted.
+ */
+export const PRIVACY_LAST_UPDATED = "2026-04-19";

apps/journal/app/routes/api.auth.register.ts

@@ -6,14 +6,18 @@ import { logger } from "~/lib/logger.server";
 
 export async function action({ request }: Route.ActionArgs) {
   const body = await request.json();
-  const { step, email, username, response, challenge, userId, termsAccepted } = body;
+  const { step, email, username, response, challenge, userId, termsAccepted, termsVersion } = body;
   const origin = process.env.ORIGIN ?? `http://localhost:3000`;
 
-  // Registration steps require terms acceptance
+  // Registration steps require terms acceptance + the version the client
+  // agreed to (stored for audit so we can tell which text the user saw).
   const requiresTerms = step === "start" || step === "finish" || step === "register-magic-link";
   if (requiresTerms && !termsAccepted) {
     return data({ error: "Terms of Service must be accepted" }, { status: 400 });
   }
+  if (requiresTerms && (typeof termsVersion !== "string" || termsVersion.length === 0)) {
+    return data({ error: "Terms of Service version missing" }, { status: 400 });
+  }
 
   try {
     if (step === "start") {
@@ -22,7 +26,7 @@ export async function action({ request }: Route.ActionArgs) {
     }
 
     if (step === "finish") {
-      const newUserId = await finishRegistration(userId, email, username, response, challenge);
+      const newUserId = await finishRegistration(userId, email, username, response, challenge, termsVersion);
       const cookie = await createSession(newUserId, request);
       sendWelcome(email, username).catch((err) =>
         logger.error({ err }, "Failed to send welcome email"),
@@ -31,7 +35,7 @@ export async function action({ request }: Route.ActionArgs) {
     }
 
     if (step === "register-magic-link") {
-      const token = await registerWithMagicLink(email, username);
+      const token = await registerWithMagicLink(email, username, termsVersion);
       const link = `${origin}/auth/verify?token=${token}`;
       if (process.env.NODE_ENV !== "production") {
         return data({ step: "magic-link-sent", devLink: link });

apps/journal/app/routes/auth.register.tsx

@@ -1,5 +1,6 @@
 import { useState, useEffect } from "react";
 import { useTranslation } from "react-i18next";
+import { TERMS_VERSION } from "~/lib/legal";
 
 export default function RegisterPage() {
   const { t } = useTranslation("journal");
@@ -32,7 +33,13 @@ export default function RegisterPage() {
       const startResp = await fetch("/api/auth/register", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ step: "start", email, username, termsAccepted }),
+        body: JSON.stringify({
+          step: "start",
+          email,
+          username,
+          termsAccepted,
+          termsVersion: TERMS_VERSION,
+        }),
       });
       const startData = await startResp.json();
 
@@ -53,6 +60,7 @@ export default function RegisterPage() {
           email,
           username,
           termsAccepted,
+          termsVersion: TERMS_VERSION,
           response: webAuthnResp,
           challenge: startData.options.challenge,
           userId: startData.userId,
@@ -85,7 +93,13 @@ export default function RegisterPage() {
       const resp = await fetch("/api/auth/register", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ step: "register-magic-link", email, username, termsAccepted }),
+        body: JSON.stringify({
+          step: "register-magic-link",
+          email,
+          username,
+          termsAccepted,
+          termsVersion: TERMS_VERSION,
+        }),
       });
       const result = await resp.json();
 

apps/journal/app/routes/legal.privacy.tsx

@@ -1,4 +1,5 @@
 import { operator } from "~/lib/operator";
+import { PRIVACY_LAST_UPDATED } from "~/lib/legal";
 
 export function meta() {
   return [
@@ -14,7 +15,7 @@ export default function PrivacyPage() {
         Datenschutzerklärung / Privacy Policy
       </h1>
       <p className="mt-2 text-sm text-gray-500">
-        Stand / Last updated: 2026-04-18. Die deutsche Fassung ist maßgeblich.
+        Stand / Last updated: {PRIVACY_LAST_UPDATED}. Die deutsche Fassung ist maßgeblich.
         The German version is authoritative; English summaries follow each
         section.
       </p>

apps/journal/app/routes/legal.terms.tsx

@@ -1,3 +1,5 @@
+import { TERMS_VERSION } from "~/lib/legal";
+
 export function meta() {
   return [
     { title: "Nutzungsbedingungen — trails.cool" },
@@ -12,7 +14,7 @@ export default function TermsPage() {
         Nutzungsbedingungen / Terms of Service
       </h1>
       <p className="mt-2 text-sm text-gray-500">
-        Stand / Last updated: 2026-04-18 • Alpha — subject to change. Die
+        Stand / Last updated: {TERMS_VERSION} • Alpha — subject to change. Die
         deutsche Fassung ist maßgeblich. The German version is authoritative;
         English summaries follow each section.
       </p>