backend fixes

backend/app/routers/agent_handoff.py

@@ -255,7 +255,8 @@ async def get_handoff_conversation(
         },
         {"$unwind": "$message"},
     ]
-    rows = [row async for row in database.mailbox_entries.aggregate(pipeline)]
+    cursor = await database.mailbox_entries.aggregate(pipeline)
+    rows = [row async for row in cursor]
     human_email = handoff.get("human_email", "").lower()
     messages: list[HandoffMessageRead] = []
     for row in rows:

backend/app/routers/threads.py

@@ -214,7 +214,8 @@ async def list_threads(
             }
         }
     )
-    rows = [row async for row in database.mailbox_entries.aggregate(pipeline)]
+    cursor = await database.mailbox_entries.aggregate(pipeline)
+    rows = [row async for row in cursor]
     has_more = len(rows) > limit
     rows = rows[:limit]
     items = [thread_summary_from_group(row, mailbox) for row in rows]
@@ -298,7 +299,8 @@ async def get_thread(
         },
         {"$unwind": "$message"},
     ]
-    rows = [row async for row in database.mailbox_entries.aggregate(pipeline)]
+    cursor = await database.mailbox_entries.aggregate(pipeline)
+    rows = [row async for row in cursor]
     if not rows:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Thread not found.")