last try

app.py

@@ -22,11 +22,11 @@ def update_token_visibility(api):
     """Update visibility of the OpenRouter token input"""
     return gr.update(visible=api == "openrouter")
 
-def update_prompt_template(prompt_format):
-    """Update the template content when a preset is selected"""
-    if prompt_format in PROMPT_TEMPLATES:
-        return PROMPT_TEMPLATES[prompt_format]
-    return ""
+def on_prompt_format_change(choice):
+    """Only update content when selecting a preset"""
+    if choice in PROMPT_TEMPLATES:
+        return PROMPT_TEMPLATES[choice]
+    return gr.update()
 
 with gr.Blocks(gr.themes.Soft()) as demo:
     gr.Markdown("# DuckDB SQL Evaluation App")
@@ -79,22 +79,20 @@ with gr.Blocks(gr.themes.Soft()) as demo:
     start_btn = gr.Button("Start Evaluation")
     output = gr.Textbox(label="Output", lines=20)
 
-    # Update token visibility
+    # Event handlers
     inference_api.change(
         fn=update_token_visibility,
         inputs=[inference_api],
         outputs=[openrouter_token]
     )
 
-    # Update template content when preset is selected
     prompt_format.change(
-        fn=update_prompt_template,
+        fn=on_prompt_format_change,
         inputs=[prompt_format],
         outputs=[custom_prompt]
     )
 
-    # Switch to custom mode when editing starts
-    custom_prompt.input(  # Using input instead of change
+    custom_prompt.input(
         fn=lambda: "custom",
         outputs=prompt_format
     )