fix migration

backend/app/memory/service.py

@@ -1,6 +1,7 @@
 import asyncio
 import json
 import threading
+from concurrent.futures import ThreadPoolExecutor
 from datetime import datetime, timezone
 from typing import Any
 
@@ -24,6 +25,16 @@ class MemoryService:
         self.db = db
         self.user_id = user_id
 
+    @staticmethod
+    def _run_async(coro):
+        """Run coroutine from sync code; safe inside FastAPI's running event loop."""
+        try:
+            asyncio.get_running_loop()
+        except RuntimeError:
+            return asyncio.run(coro)
+        with ThreadPoolExecutor(max_workers=1) as pool:
+            return pool.submit(asyncio.run, coro).result()
+
     @staticmethod
     def _schedule_rag(coro) -> None:
         def runner() -> None:
@@ -260,7 +271,7 @@ class MemoryService:
                 return await retrieve_memory_facts(query or "", user_id=self.user_id, top_k=top_k)
 
             try:
-                rag_facts = asyncio.run(_load())
+                rag_facts = self._run_async(_load())
             except Exception:
                 rag_facts = []
             if rag_facts: