fix: when to_list() on the queueinginterface buffer (eg for python cl…

…ient), if we're going to message objects make sure to deduplicate Message objects, since one Message object may correspond to multiple MemGPTMessage objects

memgpt/server/rest_api/interface.py

@@ -95,6 +95,18 @@ def to_list(self, style: Literal["obj", "api"] = "obj"):
                 break
         if len(items) > 1 and items[-1] == "STOP":
             items.pop()
+
+        # If the style is "obj", then we need to deduplicate any messages
+        # Filter down items for duplicates based on item.id
+        if style == "obj":
+            seen_ids = set()
+            unique_items = []
+            for item in reversed(items):
+                if item.id not in seen_ids:
+                    seen_ids.add(item.id)
+                    unique_items.append(item)
+            items = list(reversed(unique_items))
+
         return items
 
     def clear(self):