fix(guest): cap guest session TTL on touch

The sliding-refresh branch in validateAndTouch hardcoded SESSION_TTL_MS
(7d) for all roles, so a guest session created with GUEST_SESSION_TTL_MS
(1d) was wrongly bumped to 7d on the first touch after the touch
interval. Derive the touch TTL from row.role instead.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/data/sessions.test.ts

@@ -160,4 +160,40 @@ describe("guest sessions", () => {
     const { expiresAt } = sessions.createSession("__guest__", { ttlMs: GUEST_SESSION_TTL_MS, skipCap: true });
     expect(expiresAt).toBeLessThanOrEqual(Date.now() + GUEST_SESSION_TTL_MS + 50);
   });
+
+  it("validateAndTouch refreshes a guest session to GUEST_SESSION_TTL_MS (1d), not SESSION_TTL_MS (7d)", () => {
+    const { token } = sessions.createSession("__guest__", { ttlMs: GUEST_SESSION_TTL_MS, skipCap: true });
+    // Force the touch branch: backdate lastSeenAt past the touch interval.
+    botDb.db
+      .prepare("UPDATE sessions SET lastSeenAt = ? WHERE userId = '__guest__'")
+      .run(Date.now() - (SESSION_TOUCH_INTERVAL_MS + 1000));
+    const result = sessions.validateAndTouch(token);
+    expect(result?.role).toBe("guest");
+    const row = botDb.db
+      .prepare("SELECT expiresAt FROM sessions WHERE userId = '__guest__'")
+      .get() as { expiresAt: number };
+    // Should refresh to ~now + 1 day, NOT now + 7 days.
+    expect(row.expiresAt).toBeGreaterThan(Date.now() + GUEST_SESSION_TTL_MS - 5000);
+    expect(row.expiresAt).toBeLessThanOrEqual(Date.now() + GUEST_SESSION_TTL_MS + 5000);
+    // Sanity: well below the 7d window.
+    expect(row.expiresAt).toBeLessThan(Date.now() + SESSION_TTL_MS);
+  });
+
+  it("validateAndTouch still refreshes a non-guest (admin) session to SESSION_TTL_MS (7d) on touch", () => {
+    botDb.db
+      .prepare("INSERT INTO users (id, username, passwordHash, createdAt, updatedAt, role) VALUES ('admin1','adminuser','!',?,?, 'admin')")
+      .run(Date.now(), Date.now());
+    const { token } = sessions.createSession("admin1");
+    botDb.db
+      .prepare("UPDATE sessions SET lastSeenAt = ? WHERE userId = 'admin1'")
+      .run(Date.now() - (SESSION_TOUCH_INTERVAL_MS + 1000));
+    const result = sessions.validateAndTouch(token);
+    expect(result?.role).toBe("admin");
+    const row = botDb.db
+      .prepare("SELECT expiresAt FROM sessions WHERE userId = 'admin1'")
+      .get() as { expiresAt: number };
+    // Refreshes to ~now + 7 days, NOT the 1d guest window.
+    expect(row.expiresAt).toBeGreaterThan(Date.now() + SESSION_TTL_MS - 5000);
+    expect(row.expiresAt).toBeLessThanOrEqual(Date.now() + SESSION_TTL_MS + 5000);
+  });
 });

src/data/sessions.ts

@@ -83,7 +83,10 @@ export function createSessionStore(db: Database.Database): SessionStore {
         return null;
       }
       if (now - row.lastSeenAt > SESSION_TOUCH_INTERVAL_MS) {
-        touchStmt.run(now, now + SESSION_TTL_MS, id);
+        // Refresh against the role's own TTL — guests are short-lived (1d) and
+        // must NOT be bumped to the member/admin 7d window on touch.
+        const ttl = row.role === "guest" ? GUEST_SESSION_TTL_MS : SESSION_TTL_MS;
+        touchStmt.run(now, now + ttl, id);
       }
       return { userId: row.userId, username: row.username, role: row.role as "admin" | "member" | "guest" };
     },