diff --git a/scripts/projektarten-setup.mjs b/scripts/projektarten-setup.mjs
new file mode 100644
index 0000000..b12fd2a
--- /dev/null
+++ b/scripts/projektarten-setup.mjs
@@ -0,0 +1,96 @@
+#!/usr/bin/env node
+/**
+ * Projektarten: legt die neuen Attribute an der Collection websiteProjects an.
+ * Idempotent: vorhandene Attribute werden uebersprungen.
+ * Usage:
+ *   node scripts/projektarten-setup.mjs --check   (nur melden, nichts anlegen)
+ *   node scripts/projektarten-setup.mjs           (fehlende Attribute anlegen)
+ */
+import { pathToFileURL } from 'node:url'
+import { config } from '../server/config.js'
+
+export const PROJECT_KIND_ATTRIBUTES = [
+  { key: 'kind', type: 'string', size: 20, required: false },
+  { key: 'forCustomer', type: 'boolean', required: false },
+  { key: 'kindSetBy', type: 'string', size: 64, required: false },
+  { key: 'kindSetAt', type: 'string', size: 40, required: false },
+  { key: 'createdByGitea', type: 'string', size: 64, required: false },
+  { key: 'assignMailSentAt', type: 'string', size: 40, required: false },
+  { key: 'assignReminderSentAt', type: 'string', size: 40, required: false },
+  { key: 'assignMailAttempts', type: 'integer', required: false },
+]
+
+/** Echter Appwrite-Client (REST) fuer die Collection websiteProjects. */
+export function createAppwriteClient() {
+  const { endpoint, projectId, databaseId, apiKey } = config.appwrite
+  const collectionId = config.collections.websiteProjects
+  const base = `${endpoint.replace(/\/$/, '')}/databases/${databaseId}/collections/${collectionId}`
+
+  async function aw(path, { method = 'GET', body } = {}) {
+    const response = await fetch(`${base}${path}`, {
+      method,
+      headers: {
+        'Content-Type': 'application/json',
+        'X-Appwrite-Project': projectId,
+        'X-Appwrite-Key': apiKey,
+      },
+      body: body ? JSON.stringify(body) : undefined,
+    })
+    const data = await response.json().catch(() => ({}))
+    if (!response.ok) throw new Error(data.message || `Appwrite ${response.status}`)
+    return data
+  }
+
+  return {
+    async listAttributes() {
+      const data = await aw('/attributes')
+      return data.attributes || []
+    },
+    async createAttribute({ type, ...body }) {
+      await aw(`/attributes/${type}`, { method: 'POST', body })
+    },
+    async waitForAttribute(key, maxSec = 30) {
+      for (let i = 0; i < maxSec; i += 1) {
+        const attr = await aw(`/attributes/${key}`).catch(() => null)
+        if (attr?.status === 'available') return
+        await new Promise((r) => setTimeout(r, 1000))
+      }
+      throw new Error(`Attribut ${key} wurde nicht verfuegbar`)
+    },
+  }
+}
+
+export async function main({ check = false, client, log = console.log } = {}) {
+  const api = client || createAppwriteClient()
+  const existing = new Set((await api.listAttributes()).map((a) => a.key))
+  const missing = PROJECT_KIND_ATTRIBUTES.filter((a) => !existing.has(a.key))
+
+  for (const attr of PROJECT_KIND_ATTRIBUTES) {
+    if (existing.has(attr.key)) log(`= Attribut ${attr.key} (existiert)`)
+    else if (check) log(`- Attribut ${attr.key} FEHLT`)
+  }
+
+  if (check) {
+    log(missing.length ? `${missing.length} Attribut(e) fehlen.` : 'Alle Attribute vorhanden.')
+    return { missing }
+  }
+
+  for (const attr of missing) {
+    await api.createAttribute(attr)
+    log(`+ Attribut ${attr.key}`)
+  }
+  for (const attr of missing) await api.waitForAttribute(attr.key)
+  log('Fertig.')
+  return { missing }
+}
+
+const invokedDirectly = process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href
+if (invokedDirectly) {
+  const check = process.argv.includes('--check')
+  main({ check })
+    .then(({ missing }) => process.exit(check && missing.length ? 1 : 0))
+    .catch((e) => {
+      console.error(e.message)
+      process.exit(1)
+    })
+}
diff --git a/test/projektartenSetup.test.js b/test/projektartenSetup.test.js
new file mode 100644
index 0000000..a0b228d
--- /dev/null
+++ b/test/projektartenSetup.test.js
@@ -0,0 +1,47 @@
+import { test } from 'node:test'
+import assert from 'node:assert/strict'
+import { PROJECT_KIND_ATTRIBUTES, main } from '../scripts/projektarten-setup.mjs'
+
+function mockClient(existing = []) {
+  const created = []
+  return {
+    created,
+    async listAttributes() {
+      return existing.map((key) => ({ key }))
+    },
+    async createAttribute(attr) {
+      created.push(attr.key)
+    },
+    async waitForAttribute() {},
+  }
+}
+
+test('Schema: genau die 8 Attribute, alle optional', () => {
+  assert.deepEqual(
+    PROJECT_KIND_ATTRIBUTES.map((a) => a.key),
+    ['kind', 'forCustomer', 'kindSetBy', 'kindSetAt', 'createdByGitea', 'assignMailSentAt', 'assignReminderSentAt', 'assignMailAttempts']
+  )
+  assert.ok(PROJECT_KIND_ATTRIBUTES.every((a) => a.required === false))
+  const byKey = Object.fromEntries(PROJECT_KIND_ATTRIBUTES.map((a) => [a.key, a]))
+  assert.equal(byKey.kind.size, 20)
+  assert.equal(byKey.kindSetBy.size, 64)
+  assert.equal(byKey.createdByGitea.size, 64)
+  assert.equal(byKey.kindSetAt.size, 40)
+  assert.equal(byKey.forCustomer.type, 'boolean')
+  assert.equal(byKey.assignMailAttempts.type, 'integer')
+})
+
+test('main legt nur fehlende Attribute an (kind existiert schon)', async () => {
+  const client = mockClient(['kind'])
+  const result = await main({ check: false, client, log: () => {} })
+  assert.equal(client.created.length, 7)
+  assert.ok(!client.created.includes('kind'))
+  assert.deepEqual(result.missing.length, 7)
+})
+
+test('main --check legt nichts an und meldet Fehlende', async () => {
+  const client = mockClient(['kind'])
+  const result = await main({ check: true, client, log: () => {} })
+  assert.equal(client.created.length, 0)
+  assert.equal(result.missing.length, 7)
+})