diff --git a/DEPLOYMENT_TROUBLESHOOTING.md b/DEPLOYMENT_TROUBLESHOOTING.md
index cb815341..087d116f 100644
--- a/DEPLOYMENT_TROUBLESHOOTING.md
+++ b/DEPLOYMENT_TROUBLESHOOTING.md
@@ -47,14 +47,20 @@ See `COOLIFY_ENV_VARS.md` for complete list. Key variables for isolation:
 - ✅ **Port mismatch fixed**: Changed from 3000 to 80
 - ✅ **Container accessibility**: Traefik can now route to port 80
 - ✅ **Frontend running**: Next.js server operational on port 8000
-- ❌ **Backend failing**: PM2 bash execution error fixed
-- ⚠️ **502 errors**: Should resolve once backend starts correctly
+- ✅ **Backend running**: FastAPI server operational on port 9000
+- ❌ **Cross-deployment contamination**: LIVE calling DEV APIs and vice versa
+- ⚠️ **Root cause**: Frontend build-time API URLs not properly isolated
 
 ### Identified Issues & Fixes:
 
-**Problem**: Backend API service failing with bash execution error
-**Root Cause**: Incorrect PM2 command syntax for starting uvicorn
-**Solution**: Updated start script to use direct Python execution instead of bash interpreter
+**Problem**: Cross-deployment data contamination (LIVE sees DEV data)
+**Root Cause**: Next.js build embeds API URLs at build-time, both deployments may share same URLs
+**Solution**: Added runtime API URL patching in Docker container startup
+
+**Current Fix Applied**:
+1. ✅ Enhanced patched-start.sh to replace API URLs at runtime
+2. ✅ Added debug endpoint `/api/v1/debug/deployment` for verification
+3. ✅ Added deployment verification script `verify-isolation.sh`
 
 ### Next Debugging Steps:
 
@@ -102,14 +108,25 @@ The 502 errors should resolve once:
 
 ### Post-Deploy Verification:
 
-After redeploying, run the debug script again and verify:
+After redeploying, verify isolation works:
 ```bash
-docker exec -it <container_name> /app/debug-services.sh
+# Run the automated verification script
+./verify-isolation.sh
+
+# Or manually test the debug endpoints
+curl https://adr-lms.whitex.cloud/api/v1/debug/deployment
+curl https://edu.adradviser.ro/api/v1/debug/deployment
+
+# Check for cross-deployment API calls in browser Network tab
+# Should see only same-domain API calls:
+# - DEV: Only calls to adr-lms.whitex.cloud
+# - LIVE: Only calls to edu.adradviser.ro
 ```
 
 Expected output should show:
-- ✅ PM2 status: Both services "online" 
-- ✅ Port 9000: Backend responding with status 200
-- ✅ No bash execution errors in logs
+- ✅ Different database hosts for DEV vs LIVE
+- ✅ Different cookie domains: adr-lms.whitex.cloud vs edu.adradviser.ro  
+- ✅ No cross-domain API calls in browser Network tab
+- ✅ Separate content/courses on each deployment
 
 The port configuration fix was the critical missing piece for Traefik routing.
diff --git a/Dockerfile_coolify b/Dockerfile_coolify
index 4e7c629f..868b157e 100644
--- a/Dockerfile_coolify
+++ b/Dockerfile_coolify
@@ -69,6 +69,12 @@ find /app/web/.next -type f -name "*.js" -exec sed -i "s/domain:[^,}]*,/domain:
 find /app/web/.next -type f -name "*.js" -exec sed -i "s/domain: *process.env.LEARNHOUSE_COOKIE_DOMAIN/domain: undefined/g" {} \\;\n\
 find /app/web/.next -type f -name "*.js" -exec sed -i "s/\.domain\s*=\s*[^;]*;/\.domain = undefined;/g" {} \\;\n\
 echo "Patch complete."\n\
+echo "Patching API URLs for deployment isolation..."\n\
+if [ ! -z "$NEXT_PUBLIC_LEARNHOUSE_API_URL" ]; then\n\
+  find /app/web/.next -type f -name "*.js" -exec sed -i "s|https://[^/\"]*\\(/api/v1/\\)|${NEXT_PUBLIC_LEARNHOUSE_API_URL}|g" {} \\;\n\
+  find /app/web/.next -type f -name "*.js" -exec sed -i "s|https://[^/\"]*\\(/api/auth\\)|${NEXT_PUBLIC_LEARNHOUSE_BACKEND_URL}api/auth|g" {} \\;\n\
+  echo "API URLs patched to: $NEXT_PUBLIC_LEARNHOUSE_API_URL"\n\
+fi\n\
 sh /app/start.sh' > /app/patched-start.sh && chmod +x /app/patched-start.sh
 
 # Use the patched start script
diff --git a/apps/api/app.py b/apps/api/app.py
index c929d758..d8481637 100644
--- a/apps/api/app.py
+++ b/apps/api/app.py
@@ -1,4 +1,5 @@
 import uvicorn
+import os
 # import logfire
 from fastapi import FastAPI, Request
 from config.config import LearnHouseConfig, get_learnhouse_config
@@ -20,6 +21,15 @@ from fastapi.middleware.gzip import GZipMiddleware
 # Get LearnHouse Config
 learnhouse_config: LearnHouseConfig = get_learnhouse_config()
 
+# Debug logging for deployment isolation
+print(f"🔍 DEPLOYMENT DEBUG INFO:")
+print(f"   DEPLOYMENT_NAME: {os.environ.get('DEPLOYMENT_NAME', 'NOT_SET')}")
+print(f"   DATABASE: {learnhouse_config.database_config.sql_connection_string[:50]}...")
+print(f"   REDIS: {learnhouse_config.redis_config.redis_connection_string[:50]}...")
+print(f"   COOKIE_DOMAIN: {learnhouse_config.hosting_config.cookie_config.domain}")
+print(f"   API_DOMAIN: {learnhouse_config.hosting_config.domain}")
+print(f"🔍 END DEBUG INFO")
+
 # Global Config
 app = FastAPI(
     title=learnhouse_config.site_name,
@@ -83,3 +93,15 @@ if __name__ == "__main__":
 @app.get("/")
 async def root():
     return {"Message": "Welcome to LearnHouse ✨"}
+
+# Debug endpoint for deployment verification
+@app.get("/debug/deployment")
+async def debug_deployment():
+    import os
+    return {
+        "deployment_name": os.environ.get('DEPLOYMENT_NAME', 'NOT_SET'),
+        "cookie_domain": learnhouse_config.hosting_config.cookie_config.domain,
+        "api_domain": learnhouse_config.hosting_config.domain,
+        "database_host": learnhouse_config.database_config.sql_connection_string.split('@')[1].split('/')[0] if '@' in learnhouse_config.database_config.sql_connection_string else "unknown",
+        "redis_host": learnhouse_config.redis_config.redis_connection_string.split('@')[1].split(':')[0] if '@' in learnhouse_config.redis_config.redis_connection_string else "unknown"
+    }
diff --git a/verify-isolation.sh b/verify-isolation.sh
new file mode 100755
index 00000000..857d8275
--- /dev/null
+++ b/verify-isolation.sh
@@ -0,0 +1,88 @@
+#!/bin/bash
+
+echo "🔍 LearnHouse Deployment Isolation Verification"
+echo "==============================================="
+
+# Check DEV deployment
+echo ""
+echo "📋 DEV Deployment (adr-lms.whitex.cloud):"
+echo "----------------------------------------"
+echo "Testing API connection..."
+DEV_RESPONSE=$(curl -s https://adr-lms.whitex.cloud/api/v1/debug/deployment 2>/dev/null)
+if [ $? -eq 0 ]; then
+    echo "✅ DEV API accessible"
+    echo "   Response: $DEV_RESPONSE"
+else
+    echo "❌ DEV API not accessible"
+fi
+
+echo ""
+echo "Testing frontend..."
+DEV_FRONTEND=$(curl -s -o /dev/null -w "%{http_code}" https://adr-lms.whitex.cloud/ 2>/dev/null)
+if [ "$DEV_FRONTEND" = "200" ]; then
+    echo "✅ DEV Frontend accessible (HTTP $DEV_FRONTEND)"
+else
+    echo "❌ DEV Frontend issue (HTTP $DEV_FRONTEND)"
+fi
+
+# Check LIVE deployment
+echo ""
+echo "📋 LIVE Deployment (edu.adradviser.ro):"
+echo "---------------------------------------"
+echo "Testing API connection..."
+LIVE_RESPONSE=$(curl -s https://edu.adradviser.ro/api/v1/debug/deployment 2>/dev/null)
+if [ $? -eq 0 ]; then
+    echo "✅ LIVE API accessible"
+    echo "   Response: $LIVE_RESPONSE"
+else
+    echo "❌ LIVE API not accessible"
+fi
+
+echo ""
+echo "Testing frontend..."
+LIVE_FRONTEND=$(curl -s -o /dev/null -w "%{http_code}" https://edu.adradviser.ro/ 2>/dev/null)
+if [ "$LIVE_FRONTEND" = "200" ]; then
+    echo "✅ LIVE Frontend accessible (HTTP $LIVE_FRONTEND)"
+else
+    echo "❌ LIVE Frontend issue (HTTP $LIVE_FRONTEND)"
+fi
+
+# Analysis
+echo ""
+echo "🔍 Cross-Deployment Isolation Analysis:"
+echo "========================================"
+
+# Extract database hosts if responses are valid JSON
+if command -v jq >/dev/null 2>&1; then
+    DEV_DB=$(echo "$DEV_RESPONSE" | jq -r '.database_host // "unknown"' 2>/dev/null)
+    LIVE_DB=$(echo "$LIVE_RESPONSE" | jq -r '.database_host // "unknown"' 2>/dev/null)
+    
+    if [ "$DEV_DB" != "unknown" ] && [ "$LIVE_DB" != "unknown" ]; then
+        if [ "$DEV_DB" = "$LIVE_DB" ]; then
+            echo "⚠️  WARNING: Both deployments using same database host: $DEV_DB"
+        else
+            echo "✅ Database isolation: DEV($DEV_DB) ≠ LIVE($LIVE_DB)"
+        fi
+    fi
+    
+    DEV_COOKIE=$(echo "$DEV_RESPONSE" | jq -r '.cookie_domain // "unknown"' 2>/dev/null)
+    LIVE_COOKIE=$(echo "$LIVE_RESPONSE" | jq -r '.cookie_domain // "unknown"' 2>/dev/null)
+    
+    if [ "$DEV_COOKIE" != "unknown" ] && [ "$LIVE_COOKIE" != "unknown" ]; then
+        if [ "$DEV_COOKIE" = "$LIVE_COOKIE" ]; then
+            echo "⚠️  WARNING: Both deployments using same cookie domain: $DEV_COOKIE"
+        else
+            echo "✅ Cookie isolation: DEV($DEV_COOKIE) ≠ LIVE($LIVE_COOKIE)"
+        fi
+    fi
+else
+    echo "ℹ️  Install 'jq' for detailed analysis"
+fi
+
+echo ""
+echo "🚀 Next Steps:"
+echo "=============="
+echo "1. If APIs are accessible, check browser Network tab for cross-deployment calls"
+echo "2. Clear browser cache/cookies for both domains"
+echo "3. Test in incognito mode to verify isolation"
+echo "4. Check container logs: docker logs <container_name>"