diff --git a/tests/curl-test-collection.sh b/tests/curl-test-collection.sh
new file mode 100644
index 0000000..1d2ebad
--- /dev/null
+++ b/tests/curl-test-collection.sh
@@ -0,0 +1,514 @@
+#!/bin/bash
+
+###############################################################################
+# E2E Test Collection - Service Health & Connectivity Checks
+# Purpose: Verify all services are running and accessible
+# Author: QA/Testing Agent
+# Date: 2026-03-16
+###############################################################################
+
+set -e  # Exit on error
+
+# Color output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+# Counters
+PASSED=0
+FAILED=0
+SKIPPED=0
+
+# Configuration
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+
+# Load environment variables if .env exists
+if [ -f "$PROJECT_ROOT/.env" ]; then
+    source "$PROJECT_ROOT/.env"
+fi
+
+# Default values (can be overridden by env vars)
+FREESCOUT_HOST="${FREESCOUT_HOST:-https://ekshelpdesk.fft-it.de}"
+LITELLM_HOST="${LITELLM_HOST:-http://llm.eks-ai.apps.asgard.eks-lnx.fft-it.de}"
+MILVUS_HOST="${MILVUS_HOST:-127.0.0.1}"
+MILVUS_PORT="${MILVUS_PORT:-19530}"
+POSTGRES_HOST="${POSTGRES_HOST:-127.0.0.1}"
+POSTGRES_PORT="${POSTGRES_PORT:-5432}"
+POSTGRES_USER="${POSTGRES_USER:-kb_user}"
+POSTGRES_DB="${POSTGRES_DB:-n8n_kb}"
+N8N_HOST="${N8N_HOST:-http://localhost}"
+N8N_PORT="${N8N_PORT:-5678}"
+
+###############################################################################
+# Helper Functions
+###############################################################################
+
+log_header() {
+    echo -e "\n${BLUE}=== $1 ===${NC}\n"
+}
+
+log_pass() {
+    echo -e "${GREEN}✓ PASS${NC}: $1"
+    ((PASSED++))
+}
+
+log_fail() {
+    echo -e "${RED}✗ FAIL${NC}: $1"
+    ((FAILED++))
+}
+
+log_skip() {
+    echo -e "${YELLOW}⊘ SKIP${NC}: $1"
+    ((SKIPPED++))
+}
+
+log_info() {
+    echo -e "${BLUE}ℹ INFO${NC}: $1"
+}
+
+test_endpoint() {
+    local name="$1"
+    local method="${2:-GET}"
+    local url="$3"
+    local headers="$4"
+    local data="$5"
+    local expected_code="${6:-200}"
+
+    echo -n "Testing $name... "
+
+    # Build curl command
+    local curl_cmd="curl -s -w '%{http_code}' -X $method"
+
+    if [ -n "$headers" ]; then
+        curl_cmd="$curl_cmd -H '$headers'"
+    fi
+
+    if [ "$method" != "GET" ] && [ -n "$data" ]; then
+        curl_cmd="$curl_cmd -d '$data'"
+    fi
+
+    curl_cmd="$curl_cmd '$url' -o /tmp/response.txt"
+
+    # Execute and capture response code
+    local response_code=$(eval "$curl_cmd" 2>/dev/null || echo "000")
+
+    if [ "$response_code" = "$expected_code" ]; then
+        log_pass "$name (HTTP $response_code)"
+        return 0
+    else
+        log_fail "$name (Expected HTTP $expected_code, got $response_code)"
+        cat /tmp/response.txt 2>/dev/null | head -c 200
+        echo ""
+        return 1
+    fi
+}
+
+###############################################################################
+# Test Suite
+###############################################################################
+
+main() {
+    echo -e "${BLUE}"
+    cat << 'EOF'
+╔════════════════════════════════════════════════════════════════════════════╗
+║                    E2E Test Collection - Health Checks                      ║
+║                                                                              ║
+║  This script verifies that all microservices are running and accessible.   ║
+║  It performs basic connectivity tests and returns a summary report.        ║
+╚════════════════════════════════════════════════════════════════════════════╝
+EOF
+    echo -e "${NC}\n"
+
+    # Test Milvus Vector DB
+    log_header "1. Testing Milvus Vector Database"
+    test_milvus
+
+    # Test PostgreSQL
+    log_header "2. Testing PostgreSQL Database"
+    test_postgres
+
+    # Test Freescout
+    log_header "3. Testing Freescout API"
+    test_freescout
+
+    # Test LiteLLM
+    log_header "4. Testing LiteLLM API"
+    test_litellm
+
+    # Test n8n
+    log_header "5. Testing n8n Workflow Engine"
+    test_n8n
+
+    # Test Docker Compose Stack
+    log_header "6. Testing Docker Compose Services"
+    test_docker_compose
+
+    # Print Summary
+    print_summary
+}
+
+###############################################################################
+# Individual Test Functions
+###############################################################################
+
+test_milvus() {
+    local milvus_url="http://$MILVUS_HOST:$MILVUS_PORT"
+
+    echo "Checking Milvus at $milvus_url"
+
+    # Test health endpoint
+    echo -n "  Health check... "
+    if curl -s "$milvus_url/healthz" >/dev/null 2>&1; then
+        log_pass "Milvus is responding"
+    else
+        log_fail "Milvus health endpoint not reachable"
+        return 1
+    fi
+
+    # Test metrics endpoint
+    echo -n "  Metrics check... "
+    if curl -s "$milvus_url/metrics" >/dev/null 2>&1; then
+        log_pass "Milvus metrics available"
+    else
+        log_skip "Milvus metrics endpoint (non-critical)"
+    fi
+
+    # Test REST API version
+    echo -n "  API version check... "
+    if curl -s "$milvus_url/v1/version" >/dev/null 2>&1; then
+        log_pass "Milvus REST API responding"
+    else
+        log_fail "Milvus REST API not responding"
+    fi
+}
+
+test_postgres() {
+    echo "Checking PostgreSQL at $POSTGRES_HOST:$POSTGRES_PORT"
+
+    # Test basic connectivity
+    echo -n "  Connection test... "
+    if nc -z "$POSTGRES_HOST" "$POSTGRES_PORT" 2>/dev/null; then
+        log_pass "PostgreSQL port is open"
+    else
+        log_fail "Cannot connect to PostgreSQL port"
+        return 1
+    fi
+
+    # Test database query (if inside docker network)
+    echo -n "  Database query test... "
+    if command -v docker &> /dev/null; then
+        if docker-compose -f "$PROJECT_ROOT/docker-compose.yml" exec postgres \
+            psql -U "$POSTGRES_USER" -d "$POSTGRES_DB" -c "SELECT COUNT(*) FROM knowledge_base_updates;" \
+            >/dev/null 2>&1; then
+            log_pass "PostgreSQL database accessible and configured"
+        else
+            log_fail "PostgreSQL query failed - might be authentication issue"
+        fi
+    else
+        log_skip "PostgreSQL query test (Docker not available)"
+    fi
+
+    # Check for required tables
+    echo -n "  Schema validation... "
+    if docker-compose -f "$PROJECT_ROOT/docker-compose.yml" exec postgres \
+        psql -U "$POSTGRES_USER" -d "$POSTGRES_DB" -c \
+        "SELECT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name='knowledge_base_updates');" \
+        2>/dev/null | grep -q "t"; then
+        log_pass "Required tables exist"
+    else
+        log_skip "Schema validation (might not be initialized)"
+    fi
+}
+
+test_freescout() {
+    echo "Checking Freescout at $FREESCOUT_HOST"
+
+    # Test basic connectivity
+    echo -n "  Web server check... "
+    if curl -s -I "$FREESCOUT_HOST/login" 2>/dev/null | grep -q "200\|301\|302"; then
+        log_pass "Freescout web interface responding"
+    else
+        log_fail "Freescout web interface not responding"
+        return 1
+    fi
+
+    # Test API health (if API key available)
+    if [ -n "$FREESCOUT_API_KEY" ]; then
+        echo -n "  API authentication test... "
+        local response=$(curl -s -w '%{http_code}' \
+            -H "Authorization: Bearer $FREESCOUT_API_KEY" \
+            "$FREESCOUT_HOST/api/v1/mailboxes" -o /tmp/freescout_api_response.txt)
+
+        if [ "$response" = "200" ]; then
+            log_pass "Freescout API authenticated"
+            local mailbox_count=$(jq '.mailboxes | length' /tmp/freescout_api_response.txt 2>/dev/null)
+            log_info "Found $mailbox_count mailbox(es)"
+        else
+            log_fail "Freescout API authentication failed (HTTP $response)"
+        fi
+    else
+        log_skip "Freescout API authentication test (FREESCOUT_API_KEY not set)"
+    fi
+
+    # Test custom fields
+    if [ -n "$FREESCOUT_API_KEY" ]; then
+        echo -n "  Custom fields check... "
+        if curl -s -H "Authorization: Bearer $FREESCOUT_API_KEY" \
+            "$FREESCOUT_HOST/api/v1/custom-fields" 2>/dev/null | \
+            grep -q "AI_SUGGESTION"; then
+            log_pass "AI custom fields configured"
+        else
+            log_fail "AI custom fields not found - check Freescout configuration"
+        fi
+    fi
+}
+
+test_litellm() {
+    echo "Checking LiteLLM at $LITELLM_HOST"
+
+    # Test health endpoint
+    echo -n "  Health check... "
+    if curl -s "$LITELLM_HOST/health" >/dev/null 2>&1; then
+        log_pass "LiteLLM is responding"
+    else
+        log_fail "LiteLLM health endpoint not reachable"
+        return 1
+    fi
+
+    # Test API endpoint
+    echo -n "  API endpoint test... "
+    local test_payload='{
+        "model": "gpt-3.5-turbo",
+        "messages": [{"role": "user", "content": "test"}],
+        "max_tokens": 10
+    }'
+
+    if curl -s -X POST "$LITELLM_HOST/v1/chat/completions" \
+        -H "Content-Type: application/json" \
+        -d "$test_payload" >/dev/null 2>&1; then
+        log_pass "LiteLLM chat API responding"
+    else
+        log_fail "LiteLLM chat API not responding"
+    fi
+
+    # Test model availability
+    if [ -n "$LITELLM_API_KEY" ]; then
+        echo -n "  Model availability check... "
+        if curl -s -X GET "$LITELLM_HOST/v1/models" \
+            -H "Authorization: Bearer $LITELLM_API_KEY" 2>/dev/null | \
+            grep -q "gpt"; then
+            log_pass "Models available"
+        else
+            log_skip "Model availability (non-critical)"
+        fi
+    fi
+}
+
+test_n8n() {
+    echo "Checking n8n at $N8N_HOST:$N8N_PORT"
+
+    local n8n_url="$N8N_HOST:$N8N_PORT"
+
+    # Test REST API
+    echo -n "  REST API health... "
+    if curl -s "$n8n_url/healthz" >/dev/null 2>&1 || \
+       curl -s "$n8n_url/health" >/dev/null 2>&1; then
+        log_pass "n8n REST API responding"
+    else
+        log_fail "n8n REST API not responding (might be behind reverse proxy)"
+    fi
+
+    # Test web interface
+    echo -n "  Web interface check... "
+    if curl -s "$n8n_url/" >/dev/null 2>&1; then
+        log_pass "n8n web interface accessible"
+    else
+        log_skip "n8n web interface check (might require authentication)"
+    fi
+
+    # Test workflows endpoint (if authenticated)
+    if [ -n "$N8N_AUTH_TOKEN" ]; then
+        echo -n "  Workflow list test... "
+        if curl -s -H "Authorization: Bearer $N8N_AUTH_TOKEN" \
+            "$n8n_url/api/v1/workflows" >/dev/null 2>&1; then
+            log_pass "n8n workflows accessible"
+        else
+            log_fail "Cannot access n8n workflows"
+        fi
+    fi
+}
+
+test_docker_compose() {
+    if ! command -v docker-compose &> /dev/null; then
+        log_skip "Docker Compose not available"
+        return
+    fi
+
+    echo "Checking Docker Compose services..."
+
+    # Get list of running services
+    local services=$(docker-compose -f "$PROJECT_ROOT/docker-compose.yml" ps --services 2>/dev/null)
+
+    if [ -z "$services" ]; then
+        log_fail "No Docker Compose services found"
+        return 1
+    fi
+
+    # Check each service
+    while read -r service; do
+        echo -n "  Service: $service... "
+        if docker-compose -f "$PROJECT_ROOT/docker-compose.yml" ps "$service" 2>/dev/null | \
+            grep -q "Up"; then
+            log_pass "$service is running"
+        else
+            log_fail "$service is not running"
+        fi
+    done <<< "$services"
+
+    # Check resource usage
+    echo ""
+    echo -n "  Container resource check... "
+    if docker-compose -f "$PROJECT_ROOT/docker-compose.yml" stats --no-stream 2>/dev/null | \
+        tail -n +2 | wc -l | grep -qv "0"; then
+        log_pass "Docker containers have allocated resources"
+    else
+        log_skip "Could not read container stats"
+    fi
+}
+
+###############################################################################
+# Summary Report
+###############################################################################
+
+print_summary() {
+    local total=$((PASSED + FAILED + SKIPPED))
+    local status="PASSED"
+
+    if [ $FAILED -gt 0 ]; then
+        status="FAILED"
+    fi
+
+    echo ""
+    echo -e "${BLUE}╔════════════════════════════════════════════════════════════════╗${NC}"
+    echo -e "${BLUE}║                      Test Summary Report                        ║${NC}"
+    echo -e "${BLUE}╚════════════════════════════════════════════════════════════════╝${NC}"
+    echo ""
+    echo -e "  Total Tests:     $total"
+    echo -e "  ${GREEN}Passed:${NC}          $PASSED"
+    if [ $FAILED -gt 0 ]; then
+        echo -e "  ${RED}Failed:${NC}          $FAILED"
+    fi
+    if [ $SKIPPED -gt 0 ]; then
+        echo -e "  ${YELLOW}Skipped:${NC}         $SKIPPED"
+    fi
+    echo ""
+
+    if [ $FAILED -eq 0 ]; then
+        echo -e "${GREEN}✓ All critical services are running and accessible!${NC}"
+        echo -e "  You can proceed with E2E testing."
+        echo ""
+        return 0
+    else
+        echo -e "${RED}✗ Some services are not responding!${NC}"
+        echo -e "  Please check the failures above and ensure all services are running."
+        echo ""
+        return 1
+    fi
+}
+
+###############################################################################
+# Usage Information
+###############################################################################
+
+show_help() {
+    cat << EOF
+Usage: $0 [OPTIONS]
+
+E2E Test Collection - Service Health & Connectivity Checks
+
+Options:
+    -h, --help              Show this help message
+    -v, --verbose           Enable verbose output
+    -m, --milvus HOST:PORT  Override Milvus address (default: 127.0.0.1:19530)
+    -p, --postgres HOST:PORT Override PostgreSQL address (default: 127.0.0.1:5432)
+    -f, --freescout URL     Override Freescout URL
+    -l, --litellm URL       Override LiteLLM URL
+    -n, --n8n URL           Override n8n URL
+
+Environment Variables:
+    FREESCOUT_API_KEY       Freescout API authentication token
+    LITELLM_API_KEY         LiteLLM API authentication token
+    N8N_AUTH_TOKEN          n8n authentication token
+    POSTGRES_USER           PostgreSQL username (default: kb_user)
+    POSTGRES_DB             PostgreSQL database name (default: n8n_kb)
+
+Examples:
+    # Run basic health checks with defaults
+    $0
+
+    # Override Milvus host
+    $0 --milvus 192.168.1.100:19530
+
+    # With API keys
+    FREESCOUT_API_KEY=token123 $0
+
+EOF
+}
+
+###############################################################################
+# Main Execution
+###############################################################################
+
+# Parse command line arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -h|--help)
+            show_help
+            exit 0
+            ;;
+        -v|--verbose)
+            set -x
+            shift
+            ;;
+        -m|--milvus)
+            MILVUS_HOST="${2%:*}"
+            MILVUS_PORT="${2##*:}"
+            shift 2
+            ;;
+        -p|--postgres)
+            POSTGRES_HOST="${2%:*}"
+            POSTGRES_PORT="${2##*:}"
+            shift 2
+            ;;
+        -f|--freescout)
+            FREESCOUT_HOST="$2"
+            shift 2
+            ;;
+        -l|--litellm)
+            LITELLM_HOST="$2"
+            shift 2
+            ;;
+        -n|--n8n)
+            N8N_HOST="$2"
+            shift 2
+            ;;
+        *)
+            echo "Unknown option: $1"
+            show_help
+            exit 1
+            ;;
+    esac
+done
+
+# Run main test suite
+main
+
+# Exit with appropriate code
+if [ $FAILED -gt 0 ]; then
+    exit 1
+else
+    exit 0
+fi
diff --git a/tests/e2e-test-scenario.md b/tests/e2e-test-scenario.md
new file mode 100644
index 0000000..46be7c4
--- /dev/null
+++ b/tests/e2e-test-scenario.md
@@ -0,0 +1,527 @@
+# E2E Test: Full AI Support Automation Workflow
+
+## System Setup Prerequisites
+
+### Services Health Check
+- **Milvus Vector DB**: Accessible on port 9091
+- **PostgreSQL**: Running with KB schema and audit tables
+- **n8n**: Workflow engine operational
+- **Freescout**: Help desk system with custom fields configured
+- **LiteLLM**: LLM proxy service accessible
+- **Baramundi**: Remote execution system (optional)
+
+### Test Environment Variables
+```bash
+export FREESCOUT_API_KEY="your-api-key"
+export LITELLM_API_KEY="your-api-key"
+export N8N_AUTH_TOKEN="your-auth-token"
+export POSTGRES_PASSWORD="your-password"
+```
+
+---
+
+## E2E Test Scenario: Complete Workflow
+
+### Test Case ID: E2E-001
+**Objective**: Full workflow from ticket creation through knowledge base update
+
+---
+
+## 1. Setup Phase
+
+### Pre-Test Validation
+```bash
+# Verify all services are running
+./tests/curl-test-collection.sh
+
+# Clear test data from previous runs (optional)
+docker-compose exec postgres psql -U kb_user -d n8n_kb -c \
+  "DELETE FROM knowledge_base_updates WHERE created_at > NOW() - INTERVAL '1 hour';"
+
+docker-compose exec postgres psql -U kb_user -d n8n_kb -c \
+  "DELETE FROM ticket_audit WHERE ticket_id LIKE 'TEST_%';"
+```
+
+### Test Data Preparation
+- Create test customer: `test@example.com` in Freescout (if not exists)
+- Verify custom fields exist in Freescout:
+  - `AI_SUGGESTION` (text field)
+  - `AI_SUGGESTION_STATUS` (enum: PENDING, APPROVED, REJECTED, EXECUTED)
+  - `AI_CONFIDENCE` (number field)
+
+---
+
+## 2. Workflow A: Ticket Analysis & AI Suggestion
+
+### Test Step 1: Create Test Ticket in Freescout
+
+**Action**: Create new ticket via Freescout UI or API
+```bash
+curl -X POST https://ekshelpdesk.fft-it.de/api/v1/mailboxes/1/conversations \
+  -H "Authorization: Bearer $FREESCOUT_API_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "subject": "TEST_E2E_001: Drucker funktioniert nicht",
+    "body": "Jeder Druck-Befehl wird abgelehnt. Fehlercode 5. Bitte schnell lösen!",
+    "customer_email": "test@example.com",
+    "mailbox_id": 1
+  }'
+```
+
+**Expected Outcome**:
+- HTTP Status: 201 (Created)
+- Response contains `conversation_id`
+- Ticket visible in Freescout dashboard
+
+**Validation**:
+```bash
+# Get the created ticket ID from response
+TICKET_ID="<conversation_id_from_response>"
+echo "Created Ticket: $TICKET_ID"
+```
+
+---
+
+### Test Step 2: Wait for Workflow A Cycle (5 minutes)
+
+**Process Flow**:
+1. n8n Workflow A triggers every 5 minutes
+2. Fetches new tickets from Freescout
+3. Sends ticket text to LiteLLM for analysis
+4. Updates custom fields with AI suggestion
+
+**Wait Time**: 5 minutes (plus 1 min buffer = 6 minutes total)
+
+**During Wait - Monitor Logs**:
+```bash
+# Monitor n8n logs for workflow execution
+docker-compose logs -f n8n | grep -i "workflow_a\|ticket\|analysis"
+
+# Check PostgreSQL audit log
+docker-compose exec postgres psql -U kb_user -d n8n_kb -c \
+  "SELECT * FROM ticket_audit WHERE ticket_id = '$TICKET_ID' ORDER BY created_at DESC;"
+```
+
+**Expected n8n Logs**:
+- "Processing ticket: TEST_E2E_001"
+- "Calling LiteLLM API for analysis"
+- "Analysis complete: category=Hardware, confidence=0.92"
+- "Updated custom fields in Freescout"
+
+---
+
+### Test Step 3: Verify AI Suggestion in Freescout
+
+**Action**: Check ticket custom fields
+```bash
+curl -H "Authorization: Bearer $FREESCOUT_API_KEY" \
+  https://ekshelpdesk.fft-it.de/api/v1/conversations/$TICKET_ID
+```
+
+**Expected Response Fields**:
+```json
+{
+  "conversation": {
+    "id": "TICKET_ID",
+    "subject": "TEST_E2E_001: Drucker funktioniert nicht",
+    "custom_fields": {
+      "AI_SUGGESTION": "Hardware Problem: Drucker-Treiber fehlerhaft oder beschädigt. Empfohlene Lösung: 1) Drucker neustarten, 2) Treiber neu installieren",
+      "AI_SUGGESTION_STATUS": "PENDING",
+      "AI_CONFIDENCE": 0.92
+    }
+  }
+}
+```
+
+**Validation Checklist**:
+- ✅ `AI_SUGGESTION` is not empty
+- ✅ `AI_SUGGESTION_STATUS` = "PENDING"
+- ✅ `AI_CONFIDENCE` between 0.7 and 1.0
+- ✅ Suggestion text contains problem category and solution
+
+**Alternative: Manual Check in UI**:
+- Open ticket in Freescout
+- Scroll to custom fields section
+- Verify all three fields populated with expected values
+
+---
+
+## 3. Workflow B: Approval & Execution
+
+### Test Step 4: Approve AI Suggestion
+
+**Action**: Update custom field via API
+```bash
+curl -X PUT https://ekshelpdesk.fft-it.de/api/v1/conversations/$TICKET_ID \
+  -H "Authorization: Bearer $FREESCOUT_API_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "custom_fields": {
+      "AI_SUGGESTION_STATUS": "APPROVED"
+    }
+  }'
+```
+
+**Expected Outcome**:
+- HTTP Status: 200 (OK)
+- Custom field updated in Freescout
+
+**Validation**:
+```bash
+# Verify field was updated
+curl -H "Authorization: Bearer $FREESCOUT_API_KEY" \
+  https://ekshelpdesk.fft-it.de/api/v1/conversations/$TICKET_ID | \
+  jq '.conversation.custom_fields.AI_SUGGESTION_STATUS'
+# Expected output: "APPROVED"
+```
+
+---
+
+### Test Step 5: Wait for Workflow B Cycle (2 minutes)
+
+**Process Flow**:
+1. n8n Workflow B triggers every 2 minutes
+2. Fetches tickets with `AI_SUGGESTION_STATUS = APPROVED`
+3. Executes action based on category:
+   - **Hardware/Remote**: Create Baramundi job
+   - **Software/Config**: Send support email
+   - **Knowledge**: Update KB directly
+4. Updates status to `EXECUTED`
+
+**Wait Time**: 2 minutes (plus 1 min buffer = 3 minutes total)
+
+**During Wait - Monitor Logs**:
+```bash
+# Check n8n workflow B execution
+docker-compose logs -f n8n | grep -i "workflow_b\|approved\|executing"
+
+# Check for Baramundi job creation (if applicable)
+curl https://baramundi-api.example.com/jobs \
+  -H "Authorization: Bearer $BARAMUNDI_TOKEN" | \
+  jq '.jobs[] | select(.ticket_id == "'"$TICKET_ID"'")'
+```
+
+---
+
+### Test Step 6: Verify Execution Status
+
+**Action**: Check ticket status
+```bash
+curl -H "Authorization: Bearer $FREESCOUT_API_KEY" \
+  https://ekshelpdesk.fft-it.de/api/v1/conversations/$TICKET_ID
+```
+
+**Expected Response**:
+```json
+{
+  "conversation": {
+    "custom_fields": {
+      "AI_SUGGESTION_STATUS": "EXECUTED",
+      "EXECUTION_TIMESTAMP": "2026-03-16T14:35:00Z"
+    }
+  }
+}
+```
+
+**Validation Checklist**:
+- ✅ `AI_SUGGESTION_STATUS` = "EXECUTED"
+- ✅ `EXECUTION_TIMESTAMP` is recent
+- ✅ No errors in n8n logs
+
+---
+
+## 4. Workflow C: Knowledge Base Update
+
+### Test Step 7: Wait for Workflow C Cycle (1 minute)
+
+**Process Flow**:
+1. n8n Workflow C triggers every 1 minute
+2. Fetches executed tickets
+3. Extracts: Problem, Solution, Category
+4. Inserts into PostgreSQL `knowledge_base_updates` table
+5. Triggers Milvus vector DB embedding and indexing
+
+**Wait Time**: 1 minute (plus 1 min buffer = 2 minutes total)
+
+---
+
+### Test Step 8: Verify Knowledge Base Entry
+
+**Action 1**: Check PostgreSQL insert
+```bash
+docker-compose exec postgres psql -U kb_user -d n8n_kb -c \
+  "SELECT id, ticket_id, problem, solution, category, frequency, created_at
+   FROM knowledge_base_updates
+   WHERE ticket_id = '$TICKET_ID'
+   ORDER BY created_at DESC LIMIT 1;"
+```
+
+**Expected Output**:
+```
+ id | ticket_id | problem | solution | category | frequency | created_at
+----+-----------+---------+----------+----------+-----------+---------------------
+ 42 | TEST...   | Drucker | Treiber  | Hardware | 1         | 2026-03-16 14:35:00
+```
+
+**Action 2**: Check Milvus vector DB
+```bash
+# Query Milvus for the new KB entry
+curl -X POST http://127.0.0.1:19530/v1/search \
+  -H "Content-Type: application/json" \
+  -d '{
+    "collection_name": "knowledge_base",
+    "vectors": [
+      "vector_embedding_of_problem_text"
+    ],
+    "top_k": 10,
+    "output_fields": ["id", "ticket_id", "problem", "solution", "similarity"]
+  }' | jq '.'
+```
+
+**Expected Response**:
+```json
+{
+  "results": [
+    {
+      "id": 42,
+      "ticket_id": "TEST_E2E_001",
+      "problem": "Drucker funktioniert nicht - Fehlercode 5",
+      "solution": "Drucker neustarten und Treiber neu installieren",
+      "similarity": 0.98
+    }
+  ]
+}
+```
+
+**Validation Checklist**:
+- ✅ Record exists in `knowledge_base_updates` table
+- ✅ Fields populated: problem, solution, category, frequency
+- ✅ Record appears in Milvus search results
+- ✅ Similarity score >= 0.95 for exact match
+
+---
+
+## 5. Vector DB Search Test
+
+### Test Step 9: Search Similar Problem
+
+**Objective**: Test that similar problems can be found via vector similarity
+
+**Action**: Query Milvus with similar but different text
+```bash
+# Prepare embedding for similar problem
+curl -X POST http://127.0.0.1:19530/v1/search \
+  -H "Content-Type: application/json" \
+  -d '{
+    "collection_name": "knowledge_base",
+    "vectors": [
+      "vector_for_query: Druckerprobleme beim Ausdrucken mit Fehler"
+    ],
+    "top_k": 5,
+    "output_fields": ["id", "ticket_id", "problem", "solution", "category"]
+  }'
+```
+
+**Expected Outcome**:
+- Top result is our test KB entry
+- Similarity score > 0.85
+- Same category returned (Hardware)
+
+**Expected Result**:
+```json
+{
+  "results": [
+    {
+      "rank": 1,
+      "similarity": 0.91,
+      "ticket_id": "TEST_E2E_001",
+      "problem": "Drucker funktioniert nicht - Fehlercode 5",
+      "solution": "Drucker neustarten und Treiber neu installieren",
+      "category": "Hardware"
+    },
+    {
+      "rank": 2,
+      "similarity": 0.78,
+      "ticket_id": "OTHER_TICKET",
+      "problem": "Netzwerkdrucker nicht erreichbar",
+      "solution": "IP-Konfiguration prüfen"
+    }
+  ]
+}
+```
+
+**Validation**:
+- ✅ Test entry ranks in top 3
+- ✅ Similarity > 0.85
+- ✅ Relevant results returned
+
+---
+
+## 6. Failure Scenarios
+
+### Scenario F1: Service Unavailable
+
+**Test**: What happens if LiteLLM is unreachable?
+
+**Action**: Stop LiteLLM service
+```bash
+docker-compose stop litellm
+```
+
+**Expected Behavior**:
+- n8n Workflow A fails gracefully
+- Error logged in PostgreSQL error_log table
+- Ticket status remains PENDING
+- After service recovery, retry happens automatically
+
+**Verify**:
+```bash
+docker-compose exec postgres psql -U kb_user -d n8n_kb -c \
+  "SELECT error_message, retry_count FROM error_log WHERE ticket_id = '$TICKET_ID';"
+```
+
+**Cleanup**: Restart service
+```bash
+docker-compose up -d litellm
+```
+
+---
+
+### Scenario F2: Invalid Custom Field
+
+**Test**: What if custom field value is invalid?
+
+**Action**: Set invalid status value
+```bash
+curl -X PUT https://ekshelpdesk.fft-it.de/api/v1/conversations/$TICKET_ID \
+  -H "Authorization: Bearer $FREESCOUT_API_KEY" \
+  -d '{
+    "custom_fields": {
+      "AI_SUGGESTION_STATUS": "INVALID_VALUE"
+    }
+  }'
+```
+
+**Expected Behavior**:
+- Workflow B ignores ticket
+- Error logged
+- Manual intervention required
+
+---
+
+## 7. Test Cleanup
+
+### Post-Test Actions
+```bash
+# Archive test data
+docker-compose exec postgres psql -U kb_user -d n8n_kb -c \
+  "UPDATE ticket_audit
+   SET archived = true
+   WHERE ticket_id LIKE 'TEST_%';"
+
+# Optional: Delete test ticket from Freescout
+curl -X DELETE https://ekshelpdesk.fft-it.de/api/v1/conversations/$TICKET_ID \
+  -H "Authorization: Bearer $FREESCOUT_API_KEY"
+
+# Verify cleanup
+docker-compose exec postgres psql -U kb_user -d n8n_kb -c \
+  "SELECT COUNT(*) as active_test_tickets FROM ticket_audit
+   WHERE ticket_id LIKE 'TEST_%' AND archived = false;"
+```
+
+---
+
+## 8. Test Metrics & Success Criteria
+
+### Timing Metrics
+| Phase | Expected Duration | Tolerance |
+|-------|------------------|-----------|
+| Setup | - | - |
+| Workflow A (Analysis) | 5 min | ±1 min |
+| Workflow B (Execution) | 2 min | ±30 sec |
+| Workflow C (KB Update) | 1 min | ±30 sec |
+| **Total End-to-End** | **~8 min** | **±2 min** |
+
+### Success Criteria
+- ✅ All services respond to health checks
+- ✅ Ticket created successfully in Freescout
+- ✅ AI analysis completes within 5 min
+- ✅ Confidence score >= 0.7
+- ✅ Approval triggers execution within 2 min
+- ✅ KB entry created in PostgreSQL
+- ✅ KB entry indexed in Milvus
+- ✅ Vector search returns relevant results (similarity > 0.85)
+- ✅ All audit logs recorded correctly
+- ✅ No unhandled errors in logs
+
+### Performance Targets
+- API response time: < 2 seconds
+- LiteLLM inference: < 10 seconds
+- Milvus embedding + indexing: < 5 seconds
+- PostgreSQL inserts: < 1 second
+
+---
+
+## 9. Test Execution Checklist
+
+```bash
+# Start here:
+[ ] Verify all services running: ./tests/curl-test-collection.sh
+[ ] Create test ticket (capture TICKET_ID)
+[ ] Wait 6 minutes for Workflow A
+[ ] Verify AI_SUGGESTION populated
+[ ] Approve ticket (update AI_SUGGESTION_STATUS)
+[ ] Wait 3 minutes for Workflow B
+[ ] Verify AI_SUGGESTION_STATUS = EXECUTED
+[ ] Wait 2 minutes for Workflow C
+[ ] Verify PostgreSQL kb entry exists
+[ ] Verify Milvus vector search works
+[ ] Review all audit logs
+[ ] Clean up test data
+[ ] Document any issues found
+```
+
+---
+
+## 10. Troubleshooting Guide
+
+### Issue: AI_SUGGESTION not populated after 5 min
+
+**Check**:
+1. n8n logs: `docker-compose logs n8n | grep -i error`
+2. Freescout API connectivity: `curl https://ekshelpdesk.fft-it.de/healthz`
+3. LiteLLM service: `curl http://llm.eks-ai.apps.asgard.eks-lnx.fft-it.de/health`
+4. Custom field exists: Check Freescout admin panel
+
+### Issue: Workflow B not executing
+
+**Check**:
+1. Ticket status field correct: `curl -H "Auth: Bearer $KEY" https://ekshelpdesk.fft-it.de/api/v1/conversations/$TICKET_ID | jq '.custom_fields.AI_SUGGESTION_STATUS'`
+2. n8n Workflow B enabled: Check n8n UI
+3. Error logs: `docker-compose exec postgres psql -U kb_user -d n8n_kb -c "SELECT * FROM error_log ORDER BY created_at DESC LIMIT 5;"`
+
+### Issue: Milvus search returns no results
+
+**Check**:
+1. Milvus running: `curl http://127.0.0.1:19530/v1/healthz`
+2. KB collection exists: See Milvus documentation for collection listing
+3. Vector embedding generated: Check PostgreSQL `knowledge_base_updates.vector_embedding`
+
+---
+
+## Appendix A: API Endpoints Reference
+
+| Service | Endpoint | Purpose |
+|---------|----------|---------|
+| Freescout | `https://ekshelpdesk.fft-it.de/api/v1/conversations` | Ticket management |
+| LiteLLM | `http://llm.eks-ai.apps.asgard.eks-lnx.fft-it.de/v1/chat/completions` | AI analysis |
+| Milvus | `http://127.0.0.1:19530/v1/search` | Vector DB search |
+| PostgreSQL | `localhost:5432` | Data persistence |
+| n8n | `http://localhost:5678` | Workflow orchestration |
+
+---
+
+**Document Version**: 1.0
+**Last Updated**: 2026-03-16
+**Author**: QA/Testing Agent
+**Status**: Ready for Testing