Fix template

backend/whatsapp_templates.py

@@ -45,6 +45,13 @@ def load_custom_templates(db: Session) -> Dict[str, Dict[str, Any]]:
         templates = db.query(WhatsAppTemplate).all()
         result = {}
         for t in templates:
+            # Determine button_param_key:
+            # - If button_url contains {{1}}, default to "event_id"
+            # - Otherwise leave empty (static URL buttons don't need params)
+            button_param_key = ""
+            if t.button_url and "{{1}}" in t.button_url:
+                button_param_key = "event_id"
+            
             result[t.template_key] = {
                 "meta_name": t.meta_name,
                 "language_code": t.language_code,
@@ -59,7 +66,7 @@ def load_custom_templates(db: Session) -> Dict[str, Dict[str, Any]]:
                 "button_type": t.button_type,
                 "button_text": t.button_text,
                 "button_url": t.button_url,
-                "button_param_key": t.button_url,  # backward compat
+                "button_param_key": button_param_key,  # Derived from URL pattern
                 "fallbacks": json.loads(t.fallbacks),
                 "guest_name_key": "",
             }