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+# ANALYTICS-LÖSUNG: Implementierungsübersicht für Payload CMS
+
+*Letzte Aktualisierung: 18. Dezember 2025*
+
+## Kontext
+
+Du entwickelst das Multi-Tenant Payload CMS Backend und Next.js Frontend für 4 Websites. Diese Dokumentation beschreibt die Analytics-Lösung, die in das Frontend integriert werden muss.
+
+**Wichtig:** Frontends verwenden die **Production-API** (cms.c2sgmbh.de) und **Production-Analytics** (analytics.c2sgmbh.de).
+
+---
+
+## Architektur-Übersicht
+
+```
+┌─────────────────────────────────────────────────────────────────────────────────────┐
+│  ANALYTICS ARCHITEKTUR                                                              │
+│                                                                                     │
+│  ┌─────────────────────────────────────────────────────────────────────────────┐   │
+│  │                         OHNE CONSENT (immer aktiv)                          │   │
+│  │                                                                             │   │
+│  │   ┌─────────────────────────────────────────────────────────────────────┐   │   │
+│  │   │                      UMAMI ANALYTICS                                │   │   │
+│  │   │                                                                     │   │   │
+│  │   │   Server:    sv-analytics (10.10.181.103:3000)                      │   │   │
+│  │   │   Dashboard: http://10.10.181.103:3000                              │   │   │
+│  │   │   Script:    /custom.js (Anti-Adblock)                              │   │   │
+│  │   │   Endpoint:  /api/send                                              │   │   │
+│  │   │                                                                     │   │   │
+│  │   │   Features:                                                         │   │   │
+│  │   │   • Cookieless Tracking (DSGVO-konform ohne Einwilligung)          │   │   │
+│  │   │   • Pageviews, Sessions, Referrer, UTM-Parameter                   │   │   │
+│  │   │   • Custom Events (Newsletter, Formulare, CTAs, Downloads)         │   │   │
+│  │   │   • 100% Erfassung aller Besucher                                  │   │   │
+│  │   └─────────────────────────────────────────────────────────────────────┘   │   │
+│  └─────────────────────────────────────────────────────────────────────────────┘   │
+│                                                                                     │
+│  ┌─────────────────────────────────────────────────────────────────────────────┐   │
+│  │                    MIT CONSENT (Kategorie: "marketing")                     │   │
+│  │                                                                             │   │
+│  │   ┌─────────────────────────────────────────────────────────────────────┐   │   │
+│  │   │                    GOOGLE ADS CONVERSION                            │   │   │
+│  │   │                                                                     │   │   │
+│  │   │   Client-Side (bei Consent):                                        │   │   │
+│  │   │   • Google Ads Tag (gtag.js)                                        │   │   │
+│  │   │   • Conversion Tracking                                             │   │   │
+│  │   │   • Remarketing Audiences                                           │   │   │
+│  │   │                                                                     │   │   │
+│  │   │   Server-Side (immer, anonymisiert):                                │   │   │
+│  │   │   • Google Ads Conversion API                                       │   │   │
+│  │   │   • Enhanced Conversions (gehashte E-Mail)                          │   │   │
+│  │   │   • GCLID-basierte Attribution                                      │   │   │
+│  │   └─────────────────────────────────────────────────────────────────────┘   │   │
+│  │                                                                             │   │
+│  │   ┌─────────────────────────────────────────────────────────────────────┐   │   │
+│  │   │                  GOOGLE CONSENT MODE v2                             │   │   │
+│  │   │                                                                     │   │   │
+│  │   │   Integration mit bestehendem Orestbida Consent-Banner              │   │   │
+│  │   │   Kategorie "marketing" steuert:                                    │   │   │
+│  │   │   • ad_storage                                                      │   │   │
+│  │   │   • ad_user_data                                                    │   │   │
+│  │   │   • ad_personalization                                              │   │   │
+│  │   └─────────────────────────────────────────────────────────────────────┘   │   │
+│  └─────────────────────────────────────────────────────────────────────────────┘   │
+│                                                                                     │
+└─────────────────────────────────────────────────────────────────────────────────────┘
+```
+
+---
+
+## Infrastruktur
+
+### Umami Server
+
+| Umgebung | Server | URL | Dashboard |
+|----------|--------|-----|-----------|
+| **Production** | Hetzner 3 | https://analytics.c2sgmbh.de | https://analytics.c2sgmbh.de |
+| **Development** | sv-analytics (LXC 703) | https://umami.porwoll.tech | https://umami.porwoll.tech |
+
+| Eigenschaft | Production | Development |
+|-------------|------------|-------------|
+| **Tracking Script** | https://analytics.c2sgmbh.de/script.js | https://umami.porwoll.tech/script.js |
+| **API Endpoint** | https://analytics.c2sgmbh.de/api/send | https://umami.porwoll.tech/api/send |
+| **Datenbank** | umami_db auf Hetzner 3 | umami_db auf sv-postgres |
+
+### Website-IDs (Multi-Tenant)
+
+Die Website-IDs werden in Umami für jeden Tenant erstellt:
+
+```typescript
+// src/config/analytics.ts
+
+export const UMAMI_WEBSITE_IDS: Record<string, string> = {
+  'porwoll.de': 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx',
+  'complexcaresolutions.de': 'yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy',
+  'gunshin.de': 'zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz',
+  'zweitmeinu.ng': 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa',
+}
+
+// Production URL für Frontends
+export const UMAMI_HOST = process.env.NEXT_PUBLIC_UMAMI_HOST || 'https://analytics.c2sgmbh.de'
+```
+
+---
+
+## Frontend-Integration
+
+### 1. Umami Script Komponente
+
+```typescript
+// src/components/analytics/UmamiScript.tsx
+
+'use client'
+
+import Script from 'next/script'
+
+interface UmamiScriptProps {
+  websiteId: string
+  host?: string
+}
+
+export function UmamiScript({
+  websiteId,
+  host = 'https://analytics.c2sgmbh.de'  // Production default
+}: UmamiScriptProps) {
+  if (!websiteId) return null
+
+  return (
+    <Script
+      defer
+      src={`${host}/script.js`}
+      data-website-id={websiteId}
+      data-host-url={host}
+      strategy="afterInteractive"
+    />
+  )
+}
+```
+
+### 2. Layout Integration (Multi-Tenant)
+
+```typescript
+// src/app/layout.tsx
+
+import { UmamiScript } from '@/components/analytics/UmamiScript'
+import { UMAMI_WEBSITE_IDS, UMAMI_HOST } from '@/config/analytics'
+import { getCurrentTenant } from '@/lib/tenant'
+
+export default async function RootLayout({ 
+  children 
+}: { 
+  children: React.ReactNode 
+}) {
+  const tenant = await getCurrentTenant()
+  const umamiWebsiteId = UMAMI_WEBSITE_IDS[tenant.domain]
+
+  return (
+    <html lang="de">
+      <body>
+        {children}
+        
+        {/* Umami Analytics - Läuft OHNE Consent (cookieless) */}
+        {umamiWebsiteId && (
+          <UmamiScript 
+            websiteId={umamiWebsiteId} 
+            host={UMAMI_HOST}
+          />
+        )}
+      </body>
+    </html>
+  )
+}
+```
+
+### 3. Analytics Hook für Custom Events
+
+```typescript
+// src/hooks/useAnalytics.ts
+
+'use client'
+
+import { useCallback } from 'react'
+
+declare global {
+  interface Window {
+    umami?: {
+      track: (eventName: string, eventData?: Record<string, unknown>) => void
+    }
+    gtag?: (...args: unknown[]) => void
+    CookieConsent?: {
+      acceptedCategory: (category: string) => boolean
+    }
+  }
+}
+
+export function useAnalytics() {
+  /**
+   * Generisches Event-Tracking
+   */
+  const trackEvent = useCallback((
+    eventName: string, 
+    eventData?: Record<string, unknown>
+  ) => {
+    if (typeof window !== 'undefined' && window.umami) {
+      window.umami.track(eventName, eventData)
+    }
+  }, [])
+
+  /**
+   * Newsletter Anmeldung
+   */
+  const trackNewsletterSubscribe = useCallback((source: string = 'unknown') => {
+    trackEvent('newsletter_subscribe', { source })
+  }, [trackEvent])
+
+  /**
+   * Newsletter Bestätigung (Double Opt-In)
+   */
+  const trackNewsletterConfirm = useCallback(() => {
+    trackEvent('newsletter_confirm')
+  }, [trackEvent])
+
+  /**
+   * Kontaktformular abgesendet
+   */
+  const trackContactFormSubmit = useCallback((formType: string = 'contact') => {
+    trackEvent('contact_form_submit', { form_type: formType })
+  }, [trackEvent])
+
+  /**
+   * CTA Klick
+   */
+  const trackCtaClick = useCallback((
+    ctaName: string, 
+    ctaLocation: string = 'unknown'
+  ) => {
+    trackEvent('cta_click', { cta_name: ctaName, location: ctaLocation })
+  }, [trackEvent])
+
+  /**
+   * Download
+   */
+  const trackDownload = useCallback((
+    fileName: string, 
+    fileType: string = 'unknown'
+  ) => {
+    trackEvent('download', { file_name: fileName, file_type: fileType })
+  }, [trackEvent])
+
+  /**
+   * Funnel-Step (für Conversion-Funnels)
+   */
+  const trackFunnelStep = useCallback((
+    funnelName: string, 
+    stepNumber: number, 
+    stepName: string
+  ) => {
+    trackEvent('funnel_step', { 
+      funnel: funnelName, 
+      step: stepNumber, 
+      step_name: stepName 
+    })
+  }, [trackEvent])
+
+  /**
+   * Scroll-Tiefe
+   */
+  const trackScrollDepth = useCallback((depth: number) => {
+    trackEvent('scroll_depth', { depth_percent: depth })
+  }, [trackEvent])
+
+  /**
+   * Externer Link Klick
+   */
+  const trackExternalLink = useCallback((url: string) => {
+    trackEvent('external_link', { url })
+  }, [trackEvent])
+
+  return {
+    trackEvent,
+    trackNewsletterSubscribe,
+    trackNewsletterConfirm,
+    trackContactFormSubmit,
+    trackCtaClick,
+    trackDownload,
+    trackFunnelStep,
+    trackScrollDepth,
+    trackExternalLink,
+  }
+}
+```
+
+### 4. Server-Side Event Tracking
+
+```typescript
+// src/lib/analytics.server.ts
+
+const UMAMI_HOST = process.env.UMAMI_HOST || 'https://analytics.c2sgmbh.de'
+const UMAMI_WEBSITE_ID = process.env.UMAMI_WEBSITE_ID
+
+interface ServerEventParams {
+  event: string
+  url: string
+  websiteId?: string
+  referrer?: string
+  data?: Record<string, unknown>
+}
+
+/**
+ * Server-Side Event an Umami senden
+ * Für Events die im Backend passieren (z.B. Newsletter-Bestätigung)
+ */
+export async function trackServerEvent(params: ServerEventParams) {
+  const websiteId = params.websiteId || UMAMI_WEBSITE_ID
+  
+  if (!websiteId) {
+    console.warn('[Analytics] No websiteId configured for server-side tracking')
+    return
+  }
+
+  try {
+    const response = await fetch(`${UMAMI_HOST}/api/send`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'User-Agent': 'Payload-CMS-Server/1.0',
+      },
+      body: JSON.stringify({
+        type: 'event',
+        payload: {
+          website: websiteId,
+          url: params.url,
+          referrer: params.referrer || '',
+          name: params.event,
+          data: params.data,
+        },
+      }),
+    })
+
+    if (!response.ok) {
+      console.error('[Analytics] Server event failed:', response.status)
+    }
+  } catch (error) {
+    console.error('[Analytics] Server event error:', error)
+  }
+}
+```
+
+---
+
+## Komponenten-Beispiele
+
+### Newsletter-Formular mit Tracking
+
+```typescript
+// src/components/forms/NewsletterForm.tsx
+
+'use client'
+
+import { useState } from 'react'
+import { useAnalytics } from '@/hooks/useAnalytics'
+
+interface NewsletterFormProps {
+  source?: string  // z.B. 'footer', 'hero', 'popup'
+}
+
+export function NewsletterForm({ source = 'unknown' }: NewsletterFormProps) {
+  const [email, setEmail] = useState('')
+  const [status, setStatus] = useState<'idle' | 'loading' | 'success' | 'error'>('idle')
+  const { trackNewsletterSubscribe, trackFunnelStep } = useAnalytics()
+
+  async function handleSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    setStatus('loading')
+
+    // Funnel-Step tracken
+    trackFunnelStep('newsletter', 1, 'form_submitted')
+
+    try {
+      const response = await fetch('/api/newsletter/subscribe', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ email, source }),
+      })
+
+      if (response.ok) {
+        setStatus('success')
+        // Erfolg tracken
+        trackNewsletterSubscribe(source)
+        trackFunnelStep('newsletter', 2, 'subscription_pending')
+      } else {
+        setStatus('error')
+      }
+    } catch {
+      setStatus('error')
+    }
+  }
+
+  if (status === 'success') {
+    return (
+      <div className="p-4 bg-green-50 text-green-800 rounded">
+        Bitte bestätige deine E-Mail-Adresse.
+      </div>
+    )
+  }
+
+  return (
+    <form onSubmit={handleSubmit} className="flex gap-2">
+      <input
+        type="email"
+        value={email}
+        onChange={(e) => setEmail(e.target.value)}
+        placeholder="E-Mail-Adresse"
+        required
+        className="flex-1 px-4 py-2 border rounded"
+      />
+      <button
+        type="submit"
+        disabled={status === 'loading'}
+        className="px-6 py-2 bg-primary text-white rounded"
+      >
+        {status === 'loading' ? 'Lädt...' : 'Anmelden'}
+      </button>
+    </form>
+  )
+}
+```
+
+### CTA Button mit Tracking
+
+```typescript
+// src/components/ui/TrackedButton.tsx
+
+'use client'
+
+import { useAnalytics } from '@/hooks/useAnalytics'
+import Link from 'next/link'
+
+interface TrackedButtonProps {
+  href: string
+  ctaName: string
+  location?: string
+  children: React.ReactNode
+  className?: string
+  external?: boolean
+}
+
+export function TrackedButton({
+  href,
+  ctaName,
+  location = 'unknown',
+  children,
+  className,
+  external = false,
+}: TrackedButtonProps) {
+  const { trackCtaClick, trackExternalLink } = useAnalytics()
+
+  function handleClick() {
+    trackCtaClick(ctaName, location)
+    if (external) {
+      trackExternalLink(href)
+    }
+  }
+
+  if (external) {
+    return (
+      <a
+        href={href}
+        target="_blank"
+        rel="noopener noreferrer"
+        onClick={handleClick}
+        className={className}
+      >
+        {children}
+      </a>
+    )
+  }
+
+  return (
+    <Link href={href} onClick={handleClick} className={className}>
+      {children}
+    </Link>
+  )
+}
+```
+
+### Download-Link mit Tracking
+
+```typescript
+// src/components/ui/TrackedDownload.tsx
+
+'use client'
+
+import { useAnalytics } from '@/hooks/useAnalytics'
+
+interface TrackedDownloadProps {
+  href: string
+  fileName: string
+  fileType?: string
+  children: React.ReactNode
+  className?: string
+}
+
+export function TrackedDownload({
+  href,
+  fileName,
+  fileType = 'document',
+  children,
+  className,
+}: TrackedDownloadProps) {
+  const { trackDownload } = useAnalytics()
+
+  function handleClick() {
+    trackDownload(fileName, fileType)
+  }
+
+  return (
+    <a
+      href={href}
+      download
+      onClick={handleClick}
+      className={className}
+    >
+      {children}
+    </a>
+  )
+}
+```
+
+---
+
+## Google Ads Integration
+
+### Consent Mode v2 Komponente
+
+```typescript
+// src/components/analytics/GoogleConsentMode.tsx
+
+'use client'
+
+import Script from 'next/script'
+import { useEffect } from 'react'
+
+interface GoogleConsentModeProps {
+  googleAdsId: string
+}
+
+export function GoogleConsentMode({ googleAdsId }: GoogleConsentModeProps) {
+  useEffect(() => {
+    // Consent-Änderungen von Orestbida abonnieren
+    window.addEventListener('cc:onConsent', handleConsentChange)
+    window.addEventListener('cc:onChange', handleConsentChange)
+    
+    // Initial setzen
+    updateGoogleConsent()
+    
+    return () => {
+      window.removeEventListener('cc:onConsent', handleConsentChange)
+      window.removeEventListener('cc:onChange', handleConsentChange)
+    }
+  }, [])
+
+  function handleConsentChange() {
+    updateGoogleConsent()
+  }
+
+  function updateGoogleConsent() {
+    if (typeof window.gtag !== 'function') return
+    
+    const cc = window.CookieConsent
+    if (!cc) return
+
+    const hasMarketing = cc.acceptedCategory('marketing')
+
+    window.gtag('consent', 'update', {
+      'ad_storage': hasMarketing ? 'granted' : 'denied',
+      'ad_user_data': hasMarketing ? 'granted' : 'denied',
+      'ad_personalization': hasMarketing ? 'granted' : 'denied',
+      'analytics_storage': 'denied', // Wir nutzen Umami
+    })
+  }
+
+  return (
+    <>
+      {/* Consent Default (vor gtag.js) */}
+      <Script
+        id="google-consent-default"
+        strategy="beforeInteractive"
+        dangerouslySetInnerHTML={{
+          __html: `
+            window.dataLayer = window.dataLayer || [];
+            function gtag(){dataLayer.push(arguments);}
+            
+            gtag('consent', 'default', {
+              'ad_storage': 'denied',
+              'ad_user_data': 'denied',
+              'ad_personalization': 'denied',
+              'analytics_storage': 'denied',
+              'wait_for_update': 500
+            });
+          `,
+        }}
+      />
+
+      {/* Google Ads Tag */}
+      <Script
+        src={`https://www.googletagmanager.com/gtag/js?id=${googleAdsId}`}
+        strategy="afterInteractive"
+      />
+      
+      <Script
+        id="google-ads-config"
+        strategy="afterInteractive"
+        dangerouslySetInnerHTML={{
+          __html: `
+            gtag('js', new Date());
+            gtag('config', '${googleAdsId}', {
+              'allow_enhanced_conversions': true
+            });
+          `,
+        }}
+      />
+    </>
+  )
+}
+```
+
+### GCLID Hook (für Conversion Attribution)
+
+```typescript
+// src/hooks/useGclid.ts
+
+'use client'
+
+import { useEffect } from 'react'
+import { useSearchParams } from 'next/navigation'
+
+const GCLID_STORAGE_KEY = 'gclid'
+const GCLID_EXPIRY_DAYS = 90
+
+/**
+ * GCLID aus URL erfassen und speichern
+ */
+export function useGclid() {
+  const searchParams = useSearchParams()
+
+  useEffect(() => {
+    const gclid = searchParams.get('gclid')
+    
+    if (gclid) {
+      const data = {
+        value: gclid,
+        expires: Date.now() + (GCLID_EXPIRY_DAYS * 24 * 60 * 60 * 1000)
+      }
+      localStorage.setItem(GCLID_STORAGE_KEY, JSON.stringify(data))
+    }
+  }, [searchParams])
+}
+
+/**
+ * Gespeicherte GCLID abrufen
+ */
+export function getStoredGclid(): string | null {
+  if (typeof window === 'undefined') return null
+  
+  try {
+    const stored = localStorage.getItem(GCLID_STORAGE_KEY)
+    if (!stored) return null
+    
+    const data = JSON.parse(stored)
+    
+    if (Date.now() > data.expires) {
+      localStorage.removeItem(GCLID_STORAGE_KEY)
+      return null
+    }
+    
+    return data.value
+  } catch {
+    return null
+  }
+}
+```
+
+### Client-Side Conversion Tracking
+
+```typescript
+// src/lib/google-ads.ts
+
+declare global {
+  interface Window {
+    gtag: (...args: unknown[]) => void
+    CookieConsent: {
+      acceptedCategory: (category: string) => boolean
+    }
+  }
+}
+
+interface ConversionParams {
+  conversionId: string
+  value?: number
+  currency?: string
+  transactionId?: string
+}
+
+/**
+ * Client-Side Conversion (nur bei Marketing-Consent)
+ */
+export function trackConversion(params: ConversionParams) {
+  if (typeof window === 'undefined') return
+  if (typeof window.gtag !== 'function') return
+  
+  const hasConsent = window.CookieConsent?.acceptedCategory('marketing')
+  if (!hasConsent) return
+
+  window.gtag('event', 'conversion', {
+    'send_to': params.conversionId,
+    'value': params.value || 1.0,
+    'currency': params.currency || 'EUR',
+    'transaction_id': params.transactionId,
+  })
+}
+
+/**
+ * Enhanced Conversion Data setzen
+ */
+export function setEnhancedConversionData(data: {
+  email?: string
+  phone?: string
+  firstName?: string
+  lastName?: string
+}) {
+  if (typeof window === 'undefined') return
+  if (typeof window.gtag !== 'function') return
+  
+  const hasConsent = window.CookieConsent?.acceptedCategory('marketing')
+  if (!hasConsent) return
+
+  window.gtag('set', 'user_data', {
+    'email': data.email,
+    'phone_number': data.phone,
+    'address': {
+      'first_name': data.firstName,
+      'last_name': data.lastName,
+    }
+  })
+}
+```
+
+### Server-Side Conversion API
+
+```typescript
+// src/lib/google-ads.server.ts
+
+import crypto from 'crypto'
+
+const GOOGLE_ADS_CUSTOMER_ID = process.env.GOOGLE_ADS_CUSTOMER_ID
+const GOOGLE_ADS_CONVERSION_ACTION_ID = process.env.GOOGLE_ADS_CONVERSION_ACTION_ID
+const GOOGLE_ADS_API_TOKEN = process.env.GOOGLE_ADS_API_TOKEN
+const GOOGLE_ADS_DEVELOPER_TOKEN = process.env.GOOGLE_ADS_DEVELOPER_TOKEN
+
+interface ServerConversionParams {
+  conversionAction: string
+  email?: string
+  phone?: string
+  value?: number
+  currency?: string
+  gclid?: string
+}
+
+/**
+ * Server-Side Conversion Upload
+ * DSGVO-konform: Nur gehashte Daten
+ */
+export async function trackServerConversion(params: ServerConversionParams) {
+  if (!GOOGLE_ADS_CUSTOMER_ID || !GOOGLE_ADS_API_TOKEN) {
+    console.log('[Google Ads] Server-Side nicht konfiguriert')
+    return
+  }
+
+  const conversion: Record<string, unknown> = {
+    conversionAction: `customers/${GOOGLE_ADS_CUSTOMER_ID}/conversionActions/${GOOGLE_ADS_CONVERSION_ACTION_ID}`,
+    conversionDateTime: new Date().toISOString().replace('Z', '+00:00'),
+    conversionValue: params.value || 1.0,
+    currencyCode: params.currency || 'EUR',
+  }
+
+  if (params.gclid) {
+    conversion.gclid = params.gclid
+  }
+
+  if (params.email || params.phone) {
+    conversion.userIdentifiers = []
+    
+    if (params.email) {
+      (conversion.userIdentifiers as Array<unknown>).push({
+        hashedEmail: hashForGoogle(params.email.toLowerCase().trim())
+      })
+    }
+    
+    if (params.phone) {
+      (conversion.userIdentifiers as Array<unknown>).push({
+        hashedPhoneNumber: hashForGoogle(params.phone.replace(/[^0-9+]/g, ''))
+      })
+    }
+  }
+
+  try {
+    const response = await fetch(
+      `https://googleads.googleapis.com/v15/customers/${GOOGLE_ADS_CUSTOMER_ID}:uploadConversionAdjustments`,
+      {
+        method: 'POST',
+        headers: {
+          'Authorization': `Bearer ${GOOGLE_ADS_API_TOKEN}`,
+          'Content-Type': 'application/json',
+          'developer-token': GOOGLE_ADS_DEVELOPER_TOKEN!,
+        },
+        body: JSON.stringify({
+          conversions: [conversion],
+          partialFailure: true,
+        }),
+      }
+    )
+
+    if (!response.ok) {
+      console.error('[Google Ads] Upload failed:', await response.text())
+    }
+  } catch (error) {
+    console.error('[Google Ads] Error:', error)
+  }
+}
+
+function hashForGoogle(value: string): string {
+  return crypto.createHash('sha256').update(value).digest('hex')
+}
+```
+
+---
+
+## CookieInventory Erweiterung
+
+Füge diese Cookies zur `cookie-inventory` Collection hinzu:
+
+```typescript
+// Über Payload Admin oder Seed-Script
+
+const googleAdsCookies = [
+  {
+    name: '_gcl_au',
+    provider: 'Google Ads',
+    category: 'marketing',
+    purpose: 'Conversion-Tracking und Anzeigenmessung',
+    duration: '90 Tage',
+    type: 'first-party',
+  },
+  {
+    name: '_gcl_aw',
+    provider: 'Google Ads',
+    category: 'marketing',
+    purpose: 'Speichert GCLID für Conversion-Attribution',
+    duration: '90 Tage',
+    type: 'first-party',
+  },
+  {
+    name: 'IDE',
+    provider: 'Google (doubleclick.net)',
+    category: 'marketing',
+    purpose: 'Remarketing und Anzeigenpersonalisierung',
+    duration: '1 Jahr',
+    type: 'third-party',
+  },
+]
+```
+
+---
+
+## Environment Variables
+
+### Frontend (.env.local)
+
+```env
+# Payload CMS API (Production)
+NEXT_PUBLIC_PAYLOAD_URL=https://cms.c2sgmbh.de
+NEXT_PUBLIC_API_URL=https://cms.c2sgmbh.de/api
+
+# Umami Analytics (Production)
+NEXT_PUBLIC_UMAMI_HOST=https://analytics.c2sgmbh.de
+
+# Tenant-Konfiguration (je nach Projekt)
+NEXT_PUBLIC_TENANT_ID=4
+NEXT_PUBLIC_TENANT_SLUG=c2s
+
+# Google Ads (pro Tenant unterschiedlich)
+NEXT_PUBLIC_GOOGLE_ADS_ID=AW-XXXXXXXXX
+```
+
+### Backend (.env)
+
+```env
+# Umami Server-Side Tracking
+UMAMI_HOST=https://analytics.c2sgmbh.de
+UMAMI_WEBSITE_ID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+
+# Google Ads Server-Side API
+GOOGLE_ADS_CUSTOMER_ID=1234567890
+GOOGLE_ADS_CONVERSION_ACTION_ID=987654321
+GOOGLE_ADS_API_TOKEN=ya29.xxx
+GOOGLE_ADS_DEVELOPER_TOKEN=xxx
+```
+
+---
+
+## Event-Naming-Konvention
+
+| Event | Name | Data |
+|-------|------|------|
+| Newsletter Anmeldung | `newsletter_subscribe` | `{ source: string }` |
+| Newsletter Bestätigung | `newsletter_confirm` | - |
+| Kontaktformular | `contact_form_submit` | `{ form_type: string }` |
+| CTA Klick | `cta_click` | `{ cta_name: string, location: string }` |
+| Download | `download` | `{ file_name: string, file_type: string }` |
+| Funnel-Step | `funnel_step` | `{ funnel: string, step: number, step_name: string }` |
+| Scroll-Tiefe | `scroll_depth` | `{ depth_percent: number }` |
+| Externer Link | `external_link` | `{ url: string }` |
+
+---
+
+## Zusammenfassung
+
+```
+┌─────────────────────────────────────────────────────────────────────────────────────┐
+│  WAS IMPLEMENTIERT WERDEN MUSS                                                      │
+│                                                                                     │
+│  1. UMAMI (ohne Consent)                                                            │
+│  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  │
+│  • UmamiScript Komponente in Layout einbinden                                       │
+│  • useAnalytics Hook in Formulare/CTAs integrieren                                 │
+│  • Server-Side Events für Backend-Actions                                          │
+│                                                                                     │
+│  2. GOOGLE ADS (mit Consent)                                                        │
+│  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  │
+│  • GoogleConsentMode Komponente (integriert mit Orestbida)                         │
+│  • useGclid Hook für Attribution                                                    │
+│  • Client-Side Conversions bei Consent                                              │
+│  • Server-Side Conversions immer (gehashte Daten)                                  │
+│                                                                                     │
+│  3. COOKIE INVENTORY                                                                │
+│  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  │
+│  • Google Ads Cookies dokumentieren                                                 │
+│                                                                                     │
+└─────────────────────────────────────────────────────────────────────────────────────┘
+```
+
+---
+
+## Dateien zu erstellen
+
+```
+src/
+├── components/
+│   ├── analytics/
+│   │   ├── UmamiScript.tsx           # Umami Tracking Script
+│   │   └── GoogleConsentMode.tsx     # Google Consent Mode v2
+│   ├── forms/
+│   │   └── NewsletterForm.tsx        # Mit Analytics-Integration
+│   └── ui/
+│       ├── TrackedButton.tsx         # CTA mit Tracking
+│       └── TrackedDownload.tsx       # Download mit Tracking
+├── config/
+│   └── analytics.ts                  # Website-IDs, Config
+├── hooks/
+│   ├── useAnalytics.ts               # Client-Side Event Tracking
+│   └── useGclid.ts                   # GCLID Erfassung
+└── lib/
+    ├── analytics.server.ts           # Umami Server-Side
+    ├── google-ads.ts                 # Google Ads Client
+    └── google-ads.server.ts          # Google Ads Server API
+```
+
+---
+
+*Letzte Aktualisierung: 18. Dezember 2025*