diff --git a/server/routes/news.js b/server/routes/news.js
index d2f22f3..9202aa0 100644
--- a/server/routes/news.js
+++ b/server/routes/news.js
@@ -82,7 +82,7 @@ router.get('/', requireSession, withProject(), async (req, res) => {
   }
 })
 
-router.post('/', requireSession, rejectViewAs, limitWrites, withProject(), async (req, res) => {
+router.post('/', requireSession, rejectViewAs, withProject(), limitWrites, async (req, res) => {
   try {
     const post = await createPost({ customerId: getSessionCustomerId(req), projectId: req.projectId, input: req.body })
     res.status(201).json(post)
@@ -131,7 +131,7 @@ router.get('/image/:projectId/:file', requireSession, async (req, res) => {
   }
 })
 
-router.patch('/:id', requireSession, rejectViewAs, limitWrites, withProject(), async (req, res) => {
+router.patch('/:id', requireSession, rejectViewAs, withProject(), limitWrites, async (req, res) => {
   try {
     const post = await updatePost({ customerId: getSessionCustomerId(req), projectId: req.projectId, id: req.params.id, input: req.body })
     res.json(post)
@@ -140,7 +140,7 @@ router.patch('/:id', requireSession, rejectViewAs, limitWrites, withProject(), a
   }
 })
 
-router.delete('/:id', requireSession, rejectViewAs, limitWrites, withProject(), async (req, res) => {
+router.delete('/:id', requireSession, rejectViewAs, withProject(), limitWrites, async (req, res) => {
   try {
     await deletePost({ customerId: getSessionCustomerId(req), projectId: req.projectId, id: req.params.id })
     res.status(204).end()
diff --git a/server/routes/publicNews.js b/server/routes/publicNews.js
index 20d51e9..379ae3b 100644
--- a/server/routes/publicNews.js
+++ b/server/routes/publicNews.js
@@ -19,10 +19,16 @@ const IMAGE_FILE_RE = /^([A-Za-z0-9][A-Za-z0-9._-]*?)(-s)?\.webp$/
 
 // Limit je IP und Minute (im Speicher); die App steht hinter Traefik, 'trust proxy' ist gesetzt -> req.ip ist die Client-IP
 const hits = new Map()
+let lastPrune = 0
 function rateLimited(ip) {
   const now = Date.now()
-  for (const [key, entry] of hits) if (now - entry.start >= WINDOW_MS) hits.delete(key)
+  // Aufraeumen hoechstens einmal je Fenster
+  if (now - lastPrune >= WINDOW_MS) {
+    lastPrune = now
+    for (const [key, entry] of hits) if (now - entry.start >= WINDOW_MS) hits.delete(key)
+  }
   let entry = hits.get(ip)
+  if (entry && now - entry.start >= WINDOW_MS) entry = null
   if (!entry) {
     entry = { start: now, count: 0 }
     hits.set(ip, entry)
@@ -34,12 +40,12 @@ function rateLimited(ip) {
 router.use((req, res, next) => {
   res.set({
     'Access-Control-Allow-Origin': '*',
-    'Access-Control-Allow-Methods': 'GET, OPTIONS',
+    'Access-Control-Allow-Methods': 'GET, HEAD, OPTIONS',
     'Access-Control-Allow-Headers': 'Content-Type, If-None-Match',
     'Access-Control-Max-Age': '86400',
   })
   if (req.method === 'OPTIONS') return res.sendStatus(204)
-  if (req.method !== 'GET') return res.status(405).json({ error: 'Methode nicht erlaubt' })
+  if (req.method !== 'GET' && req.method !== 'HEAD') return res.status(405).json({ error: 'Methode nicht erlaubt' })
   if (rateLimited(req.ip)) {
     res.set('Retry-After', '60')
     return res.status(429).json({ error: 'Zu viele Anfragen. Bitte versuch es gleich noch einmal.' })
@@ -67,7 +73,7 @@ router.get('/:siteKey', async (req, res) => {
     return sendJsonWithEtag(req, res, {
       posts: posts.map((p) => ({
         ...p,
-        image: p.image ? { w: p.image.w, h: p.image.h, src: `${base}/${p.id}.webp`, srcSmall: `${base}/${p.id}-s.webp` } : null,
+        image: p.image ? { w: p.image.w, h: p.image.h, src: `${base}/${p.id}.webp?v=${p.image.v}`, srcSmall: `${base}/${p.id}-s.webp?v=${p.image.v}` } : null,
       })),
       hasMore,
     })
diff --git a/server/services/newsPosts.js b/server/services/newsPosts.js
index 8155183..af1b58d 100644
--- a/server/services/newsPosts.js
+++ b/server/services/newsPosts.js
@@ -191,7 +191,9 @@ export async function publicPage(projectId, page, now = new Date()) {
   const slice = hanging.slice((n - 1) * PAGE_SIZE, n * PAGE_SIZE)
   const posts = []
   for (const p of slice) {
-    const image = p.imageId ? await readNewsImageMeta(projectId, p.imageId) : null
+    const meta = p.imageId ? await readNewsImageMeta(projectId, p.imageId) : null
+    // v (Zeitstempel der letzten Aenderung) dient der Route als Cache-Buster fuer die Bild-URL
+    const image = meta ? { ...meta, v: Date.parse(p.updatedAt || p.visibleFrom) } : null
     posts.push({ id: p.$id, type: p.type, title: p.title, text: p.text, paper: p.paper, date: berlinDay(p.visibleFrom), image })
   }
   return { posts, hasMore: hanging.length > n * PAGE_SIZE }
diff --git a/test/newsPosts.test.js b/test/newsPosts.test.js
index 648ea66..c53e9d5 100644
--- a/test/newsPosts.test.js
+++ b/test/newsPosts.test.js
@@ -91,7 +91,8 @@ test('oeffentlich_nur_haengende_ohne_interna', async () => {
   assert.equal(p1.posts.length, 6)
   assert.equal(p1.hasMore, true)
   assert.equal(p1.posts[0].title, 'Mit Foto')
-  assert.deepEqual(p1.posts[0].image, { w: 40, h: 30 })
+  assert.deepEqual({ ...p1.posts[0].image, v: undefined }, { w: 40, h: 30, v: undefined })
+  assert.ok(Number.isFinite(p1.posts[0].image.v), 'v = Cache-Buster fuer die Route')
   assert.equal(p1.posts[0].date, '2026-10-01')
   assert.equal(p1.posts[1].image, null)
   for (const p of p1.posts) {
diff --git a/test/newsRoutes.test.js b/test/newsRoutes.test.js
index 2a935e8..324285a 100644
--- a/test/newsRoutes.test.js
+++ b/test/newsRoutes.test.js
@@ -96,11 +96,11 @@ test('oeffentlich_cors_cache', async () => {
   assert.equal(res.headers.get('access-control-allow-origin'), '*')
   assert.equal(res.headers.get('cache-control'), 'public, max-age=60')
   const text = await res.text()
-  assert.ok(!text.includes('c1') && !text.includes('"p1"') && !text.includes('customerId') && !text.includes('projectId'))
+  assert.ok(!text.includes('"c1"') && !text.includes('"p1"') && !text.includes('customerId') && !text.includes('projectId'))
   const body = JSON.parse(text)
   assert.equal(body.posts.length, 1)
-  assert.equal(body.posts[0].image.src, `/api/public/news/${KEY}/img/${created.body.$id}.webp`)
-  assert.equal(body.posts[0].image.srcSmall, `/api/public/news/${KEY}/img/${created.body.$id}-s.webp`)
+  assert.equal(body.posts[0].image.src, `/api/public/news/${KEY}/img/${created.body.$id}.webp?v=${Date.parse(created.body.updatedAt)}`)
+  assert.equal(body.posts[0].image.srcSmall, `/api/public/news/${KEY}/img/${created.body.$id}-s.webp?v=${Date.parse(created.body.updatedAt)}`)
   const etag = res.headers.get('etag')
   assert.match(etag, /^W\//)
   const again = await call('GET', `/api/public/news/${KEY}`, { cookie: null, headers: { 'if-none-match': etag } })
@@ -140,3 +140,39 @@ test('rate_limit_schreiben', async () => {
   assert.ok(statuses.slice(0, 30).every((s) => s === 201), statuses.join())
   assert.equal(statuses[30], 429)
 })
+
+test('cache_buster_aendert_sich_beim_bildtausch', async () => {
+  const first = await (await upload('p1')).json()
+  const created = await post('/api/news', { ...note, type: 'photo', imageId: first.imageId }, { cookie })
+  const src = async () => (await (await call('GET', `/api/public/news/${KEY}`, { cookie: null })).json()).posts.find((p) => p.id === created.body.$id).image
+  const before = await src()
+  assert.match(before.src, /\.webp\?v=\d+$/)
+  assert.match(before.srcSmall, /-s\.webp\?v=\d+$/)
+  await new Promise((r) => setTimeout(r, 15))
+  const second = await (await upload('p1')).json()
+  const res = await call('PATCH', `/api/news/${created.body.$id}`, { body: { ...note, type: 'photo', imageId: second.imageId } })
+  assert.equal(res.status, 200)
+  const now = await src()
+  assert.notEqual(now.src, before.src)
+  assert.equal((await call('GET', now.src, { cookie: null })).status, 200)
+})
+
+test('tippfehler_zaehlt_nicht_gegen_schreiblimit', async () => {
+  aw.seed('websiteProjects', { $id: 'p4', customerId: 'c3', projectName: 'Tippfehler' })
+  feature('p4', 'c3', 'active', 'defghijklmnopqrs')
+  const c = customerCookie('c3')
+  for (let i = 0; i < 35; i++) assert.equal((await post('/api/news', { ...note, projectId: 'gibtsnicht' }, { cookie: c })).status, 403)
+  assert.equal((await post('/api/news', { ...note, projectId: 'p4' }, { cookie: c })).status, 201)
+})
+
+test('head_erlaubt', async () => {
+  assert.equal((await call('HEAD', `/api/public/news/${KEY}`, { cookie: null })).status, 200)
+})
+
+test('oeffentlich_rate_limit_429', async () => {
+  const ip = { 'x-forwarded-for': '203.0.113.77' }
+  const statuses = []
+  for (let i = 0; i < 121; i++) statuses.push((await call('GET', `/api/public/news/${KEY2}`, { cookie: null, headers: ip })).status)
+  assert.ok(statuses.slice(0, 120).every((s) => s === 200))
+  assert.equal(statuses[120], 429)
+})