delete all tokens when creating new link

app.py

@@ -47,6 +47,7 @@ class DMButton(Button):
 
     async def callback(self, interaction: discord.Interaction):
         # await interaction.user.send(self.message) # this is for DMs, but users may have DMs disabled
+        del user_tokens[int(self.user_id)] # always delete all past tokens when creating new link
         unique_string = generate_unique_string()
         user_tokens[self.user_id] = unique_string
         unique_link = f"{GRADIO_APP_URL}?user_id={self.user_id}&token={unique_string}"
@@ -74,7 +75,7 @@ def hello(profile: gr.OAuthProfile | None, request: gr.Request) -> str:
 
     if user_id is None or token is None:
         return "# ❌ Invalid link. Generate a new link [here](https://discord.com/channels/879548962464493619/900125909984624713) !"
-
+        
     if int(user_id) not in user_tokens or user_tokens[int(user_id)] != token:
         return "# ❌ Invalid or expired link. Generate a new link [here](https://discord.com/channels/879548962464493619/900125909984624713) !"
 
@@ -87,6 +88,7 @@ def hello(profile: gr.OAuthProfile | None, request: gr.Request) -> str:
     # profile.username
     return f"# ✅ Verification successful! We have linked your Hugging Face and Discord accounts. You can now earn exp for activity on Hugging Face as well as on Discord!"
 
+
 with gr.Blocks() as demo:
     with gr.Row():
         gr.Markdown("# Discord Verification Space")