feat: message history and PostgreSQL checkpointer integration

surfsense_backend/main.py

@@ -1,9 +1,15 @@
 import argparse
+import asyncio
 import logging
+import sys
 
 import uvicorn
 from dotenv import load_dotenv
 
+# Fix for Windows: psycopg requires SelectorEventLoop, not ProactorEventLoop
+if sys.platform == "win32":
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+
 from app.config.uvicorn import load_uvicorn_config
 
 logging.basicConfig(