diff --git a/app/contacts/backend/router.py b/app/contacts/backend/router.py
index 1b69e06..fd7ce59 100644
--- a/app/contacts/backend/router.py
+++ b/app/contacts/backend/router.py
@@ -12,6 +12,56 @@ logger = logging.getLogger(__name__)
 router = APIRouter()
 
 
+@router.get("/contacts/debug", response_model=dict)
+async def debug_contacts():
+    """
+    Debug endpoint: Check contact-company links
+    """
+    try:
+        # Count links
+        links = execute_query("SELECT COUNT(*) as total FROM contact_companies")
+        
+        # Get sample with links
+        sample = execute_query("""
+            SELECT 
+                c.id, c.first_name, c.last_name,
+                COUNT(cc.customer_id) as company_count,
+                ARRAY_AGG(cu.name) as company_names
+            FROM contacts c
+            LEFT JOIN contact_companies cc ON c.id = cc.contact_id
+            LEFT JOIN customers cu ON cc.customer_id = cu.id
+            GROUP BY c.id, c.first_name, c.last_name
+            HAVING COUNT(cc.customer_id) > 0
+            LIMIT 10
+        """)
+        
+        # Test the actual query used in get_contacts
+        test_query = """
+            SELECT 
+                c.id, c.first_name, c.last_name,
+                COUNT(DISTINCT cc.customer_id) as company_count,
+                ARRAY_AGG(DISTINCT cu.name ORDER BY cu.name) FILTER (WHERE cu.name IS NOT NULL) as company_names
+            FROM contacts c
+            LEFT JOIN contact_companies cc ON c.id = cc.contact_id
+            LEFT JOIN customers cu ON cc.customer_id = cu.id
+            GROUP BY c.id, c.first_name, c.last_name
+            ORDER BY c.last_name, c.first_name
+            LIMIT 10
+        """
+        test_result = execute_query(test_query)
+        
+        return {
+            "total_links": links[0]['total'] if links else 0,
+            "sample_contacts_with_companies": sample or [],
+            "test_query_result": test_result or [],
+            "note": "If company_count is 0, the JOIN might not be working"
+        }
+        
+    except Exception as e:
+        logger.error(f"Debug failed: {e}", exc_info=True)
+        raise HTTPException(status_code=500, detail=str(e))
+
+
 @router.get("/contacts", response_model=dict)
 async def get_contacts(
     search: Optional[str] = None,