fix windows PyiFrozenLoader error

src/core/backup_reader.py

@@ -6,12 +6,13 @@ Discord API.  Implements the same public interface as DiscordReader so that
 migration scripts and UI code can use either provider transparently.
 """
 
+from __future__ import annotations
 import json
 import logging
 from datetime import datetime, timezone
 from enum import IntEnum
 from pathlib import Path
-from typing import AsyncGenerator, Dict, Any, List, Optional
+from typing import AsyncGenerator, Dict, Any, List, Optional, Union
 from src.core.backup_database import BackupDatabase, parse_snowflake
 
 logger = logging.getLogger(__name__)

src/core/database.py

@@ -1,9 +1,10 @@
+from __future__ import annotations
 import sqlite3
 import logging
 import json
 import random
 from pathlib import Path
-from typing import Optional, Dict, Any
+from typing import Optional, Dict, Any, Union
 import threading
 import sys
 from src.core.utils import parse_snowflake