Update app.py

app.py

@@ -208,6 +208,7 @@ async def on_message(message):
                                                 print(f"Could not DM user before ban: {dm_err}")
                     
                                             await member.ban(
+                                                delete_message_seconds=600, # delete all messages from past 10 minutes
                                                 reason=f"Auto-ban: reached {spam_count} spam alerts within ~{cooldown_duration}s inter-arrival window"
                                             )