diff --git a/scripts/preview-runner-setup.mjs b/scripts/preview-runner-setup.mjs
index 8ca18df..078edd1 100644
--- a/scripts/preview-runner-setup.mjs
+++ b/scripts/preview-runner-setup.mjs
@@ -15,6 +15,7 @@ export const PREVIEW_RUNNER_ATTRIBUTES = [
   { key: 'previewState', type: 'string', size: 20, required: false },
   { key: 'previewDetected', type: 'string', size: 40, required: false },
   { key: 'previewBuiltSha', type: 'string', size: 40, required: false },
+  { key: 'previewBranch', type: 'string', size: 100, required: false },
   { key: 'previewBuiltAt', type: 'string', size: 40, required: false },
   { key: 'previewError', type: 'string', size: 500, required: false },
 ]
diff --git a/server/services/previewDeploy.js b/server/services/previewDeploy.js
index ec4fdac..a6c2962 100644
--- a/server/services/previewDeploy.js
+++ b/server/services/previewDeploy.js
@@ -461,34 +461,46 @@ export async function waitForDevRegistration() {
   while (registering) await registering
 }
 
-function registerDevSpecs(projects) {
-  if (registering) return
-  registering = (async () => {
-    const key = envKey()
-    await Promise.allSettled(
-      projects.map(async (project) => {
-        const sub = project.subdomain
-        try {
-          const repo = project.repoFullName
-          if (!repo) return
-          const branch = project.previewBranch || 'main'
-          let sha = project.previewBuiltSha
-          if (!SHA_RE.test(String(sha || ''))) {
-            try { sha = await resolveSha(repo, branch, null) } catch (err) {
-              console.error(`[previewDeploy] Dev-Registrierung ${sub} uebersprungen:`, err.message)
-              return
-            }
-          }
-          let env = {}
-          if (project.previewEnv && key) {
-            try { env = decryptEnv(project.previewEnv, key) } catch { env = {} }
-          }
-          await runnerClient.startDev(sub, { sub, repo, sha, branch, mode: 'dev', env })
-        } catch (err) {
-          console.error(`[previewDeploy] Dev-Registrierung ${sub} fehlgeschlagen:`, err.message)
+let pendingProjects = null
+
+async function registerDevRound(projects) {
+  const key = envKey()
+  await Promise.allSettled(
+    projects.map(async (project) => {
+      const sub = project.subdomain
+      try {
+        const repo = project.repoFullName
+        const { previewBranch: branch, previewBuiltSha: sha } = project
+        // Kein Raten (R17): ohne gespeicherten Branch/Stand wird uebersprungen
+        if (!repo || !branch || !SHA_RE.test(String(sha || ''))) {
+          console.error(`[previewDeploy] Dev-Registrierung ${sub} uebersprungen: Branch oder Stand unbekannt`)
+          return
         }
-      })
-    )
+        let env = {}
+        if (project.previewEnv) {
+          try { env = decryptEnv(project.previewEnv, key) } catch {
+            console.error(`[previewDeploy] Dev-Registrierung ${sub} uebersprungen: Variablen nicht entschluesselbar`)
+            return
+          }
+        }
+        await runnerClient.startDev(sub, { sub, repo, sha, branch, mode: 'dev', env })
+      } catch (err) {
+        console.error(`[previewDeploy] Dev-Registrierung ${sub} fehlgeschlagen:`, err.message)
+      }
+    })
+  )
+}
+
+function registerDevSpecs(projects) {
+  // Laeuft schon eine Runde: genau eine Wiederholung danach (mit dem neuesten Stand)
+  if (registering) { pendingProjects = projects; return }
+  registering = (async () => {
+    let next = projects
+    while (next) {
+      pendingProjects = null
+      await registerDevRound(next)
+      next = pendingProjects
+    }
   })().finally(() => { registering = null })
 }
 
@@ -613,7 +625,12 @@ async function followRun({ repoFullName, project, token, runId, subdomain, job,
     const now = new Date().toISOString()
     if (!failure && run?.state === 'done') {
       const detected = detectedLabel(run.detected, run.result)
-      const base = { previewDetected: detected, previewError: warning || '' }
+      const base = {
+        previewDetected: detected,
+        previewError: warning || '',
+        previewBranch: job.branch,
+        previewBuiltSha: run.sha || job.sha,
+      }
       if (run.result === 'dev') {
         await patchProject(repoFullName, project, { ...base, previewState: 'sleeping' })
         try { await runnerClient.startDev(subdomain, job) } catch (err) {
@@ -621,7 +638,7 @@ async function followRun({ repoFullName, project, token, runId, subdomain, job,
         }
       } else {
         await patchProject(repoFullName, project, {
-          ...base, previewState: 'online', previewBuiltSha: run.sha || job.sha, previewBuiltAt: now,
+          ...base, previewState: 'online', previewBuiltAt: now,
         })
       }
     } else {
diff --git a/test/previewDevRouter.test.js b/test/previewDevRouter.test.js
index 5cdf095..4bd93a3 100644
--- a/test/previewDevRouter.test.js
+++ b/test/previewDevRouter.test.js
@@ -34,6 +34,7 @@ before(async () => {
   await new Promise((r) => runner.listen(0, '127.0.0.1', r))
   gitea = http.createServer((req, res) => {
     res.setHeader('Content-Type', 'application/json')
+    giteaHits++
     if (giteaDown) { res.statusCode = 500; return res.end('{}') }
     res.end(JSON.stringify({ commit: { id: HEAD } }))
   })
@@ -62,7 +63,7 @@ before(async () => {
   await createDocument('websiteProjects', { ...base, subdomain: 'statisch', previewState: 'online', previewDetected: 'build:npm' }, 'p2')
   await createDocument('websiteProjects', {
     ...base, subdomain: 'devapp', repoFullName: 'JUSN/devapp', previewState: 'sleeping', previewDetected: 'dev:npm',
-    previewBuiltSha: BUILT, previewEnv: envLib.encryptEnv({ API_KEY: 'geheim-wert' }, key),
+    previewBuiltSha: BUILT, previewBranch: 'feature-x', previewEnv: envLib.encryptEnv({ API_KEY: 'geheim-wert' }, key),
   }, 'p3')
   await createDocument('websiteProjects', {
     ...base, subdomain: 'devoff', repoFullName: 'JUSN/devoff', previewState: 'failed', previewDetected: 'dev:npm',
@@ -182,18 +183,21 @@ test('Registrierung: Runner bekommt Spec mit entschluesselten Variablen', async
   assert.equal(puts.length, 1)
   assert.equal(puts[0].url, '/dev/devapp')
   assert.deepEqual(puts[0].body, {
-    sub: 'devapp', repo: 'JUSN/devapp', sha: BUILT, branch: 'main', mode: 'dev', env: { API_KEY: 'geheim-wert' },
+    sub: 'devapp', repo: 'JUSN/devapp', sha: BUILT, branch: 'feature-x', mode: 'dev', env: { API_KEY: 'geheim-wert' },
   })
 })
 
-test('Registrierung: ohne PREVIEW_ENV_KEY env = {}', async () => {
+test('Registrierung: nicht entschluesselbare Variablen (Schluessel fehlt) => uebersprungen', async () => {
   const saved = process.env.PREVIEW_ENV_KEY
   delete process.env.PREVIEW_ENV_KEY
+  const errors = console.error
+  console.error = () => {}
   try {
     await pd.syncPreviewTls()
     await pd.waitForDevRegistration()
-  } finally { process.env.PREVIEW_ENV_KEY = saved }
-  assert.deepEqual(puts[0].body.env, {})
+  } finally { process.env.PREVIEW_ENV_KEY = saved; console.error = errors }
+  assert.equal(puts.length, 0)
+  assert.match(await read(), /preview-runner@docker/)
 })
 
 test('Registrierung: Runner-Fehler bricht den Abgleich nicht, Datei ist geschrieben', async () => {
@@ -210,30 +214,45 @@ test('Registrierung: Runner-Fehler bricht den Abgleich nicht, Datei ist geschrie
   assert.match(await read(), /preview-runner@docker/)
 })
 
-test('Registrierung: ohne gebauten Stand wird der Branch-Kopf genutzt, bei Fehlschlag uebersprungen', async () => {
+let giteaHits = 0
+
+test('Registrierung: fehlender Stand oder Branch => uebersprungen, kein Gitea-Aufruf', async () => {
   const { updateDocument } = await import('../server/services/appwriteAdmin.js')
-  await updateDocument('websiteProjects', 'p3', { previewBuiltSha: '' })
+  const errors = console.error
+  console.error = () => {}
+  try {
+    for (const patch of [{ previewBuiltSha: '' }, { previewBranch: '' }]) {
+      await updateDocument('websiteProjects', 'p3', patch)
+      giteaHits = 0
+      puts.length = 0
+      await pd.syncPreviewTls()
+      await pd.waitForDevRegistration()
+      assert.equal(puts.length, 0)
+      assert.equal(giteaHits, 0)
+      assert.match(await read(), /preview-runner@docker/)
+      await updateDocument('websiteProjects', 'p3', { previewBuiltSha: BUILT, previewBranch: 'feature-x' })
+    }
+  } finally { console.error = errors }
+})
+
+test('Registrierung: kaputte verschluesselte Variablen => uebersprungen', async () => {
+  const { updateDocument } = await import('../server/services/appwriteAdmin.js')
+  const good = envLib.encryptEnv({ API_KEY: 'geheim-wert' }, key)
+  await updateDocument('websiteProjects', 'p3', { previewEnv: 'v1:xx:yy:zz' })
+  const errors = console.error
+  console.error = () => {}
   try {
     await pd.syncPreviewTls()
     await pd.waitForDevRegistration()
-    assert.equal(puts[0].body.sha, HEAD)
-    puts.length = 0
-    giteaDown = true
-    const errors = console.error
-    console.error = () => {}
-    try {
-      await pd.syncPreviewTls()
-      await pd.waitForDevRegistration()
-    } finally { console.error = errors }
-    assert.equal(puts.length, 0)
-    assert.match(await read(), /preview-runner@docker/) // Router trotzdem da
   } finally {
-    await updateDocument('websiteProjects', 'p3', { previewBuiltSha: BUILT })
+    console.error = errors
+    await updateDocument('websiteProjects', 'p3', { previewEnv: good })
   }
+  assert.equal(puts.length, 0)
 })
 
-test('Registrierung: keine zwei Runden gleichzeitig', async () => {
-  await Promise.all([pd.syncPreviewTls(), pd.syncPreviewTls()])
+test('Registrierung: laeuft eine Runde, folgt genau eine Wiederholung', async () => {
+  await Promise.all([pd.syncPreviewTls(), pd.syncPreviewTls(), pd.syncPreviewTls()])
   await pd.waitForDevRegistration()
-  assert.equal(puts.length, 1)
+  assert.equal(puts.length, 2)
 })
diff --git a/test/previewRunner.test.js b/test/previewRunner.test.js
index b1ab5e0..58d4c20 100644
--- a/test/previewRunner.test.js
+++ b/test/previewRunner.test.js
@@ -157,6 +157,8 @@ test('dev: sleeping + Registrierung per PUT /dev/<sub>', async () => {
   await pd.waitForRunFollowers()
   const d = aw.get('websiteProjects', id)
   assert.equal(d.previewState, 'sleeping')
+  assert.equal(d.previewBranch, 'main')
+  assert.equal(d.previewBuiltSha, SHA)
   assert.equal(d.previewDetected, 'dev:pnpm')
   const put = rs.calls.find((c) => c.method === 'PUT')
   assert.equal(put.url, `/dev/${repo.split('/')[1]}`)
diff --git a/test/previewRunnerSetup.test.js b/test/previewRunnerSetup.test.js
index bb556b7..9a7aa08 100644
--- a/test/previewRunnerSetup.test.js
+++ b/test/previewRunnerSetup.test.js
@@ -17,10 +17,10 @@ function mockClient(existing = []) {
   }
 }
 
-test('Schema: genau die 7 Attribute mit Groessen, alle optional', () => {
+test('Schema: genau die 8 Attribute mit Groessen, alle optional', () => {
   assert.deepEqual(
     PREVIEW_RUNNER_ATTRIBUTES.map((a) => a.key),
-    ['previewMode', 'previewEnv', 'previewState', 'previewDetected', 'previewBuiltSha', 'previewBuiltAt', 'previewError']
+    ['previewMode', 'previewEnv', 'previewState', 'previewDetected', 'previewBuiltSha', 'previewBranch', 'previewBuiltAt', 'previewError']
   )
   assert.ok(PREVIEW_RUNNER_ATTRIBUTES.every((a) => a.required === false && a.type === 'string'))
   const sizes = Object.fromEntries(PREVIEW_RUNNER_ATTRIBUTES.map((a) => [a.key, a.size]))
@@ -30,6 +30,7 @@ test('Schema: genau die 7 Attribute mit Groessen, alle optional', () => {
     previewState: 20,
     previewDetected: 40,
     previewBuiltSha: 40,
+    previewBranch: 100,
     previewBuiltAt: 40,
     previewError: 500,
   })
@@ -38,16 +39,16 @@ test('Schema: genau die 7 Attribute mit Groessen, alle optional', () => {
 test('main legt nur fehlende Attribute an', async () => {
   const client = mockClient(['previewMode'])
   const result = await main({ check: false, client, log: () => {} })
-  assert.equal(client.created.length, 6)
+  assert.equal(client.created.length, 7)
   assert.ok(!client.created.includes('previewMode'))
-  assert.equal(result.missing.length, 6)
+  assert.equal(result.missing.length, 7)
 })
 
 test('main --check legt nichts an und meldet Fehlende', async () => {
   const client = mockClient(['previewMode'])
   const result = await main({ check: true, client, log: () => {} })
   assert.equal(client.created.length, 0)
-  assert.equal(result.missing.length, 6)
+  assert.equal(result.missing.length, 7)
 })
 
 test('Konfiguration: previewRunner ist standardmaessig aus', () => {