feat(sqlalchemy): Replace peewee with sqlalchemy

backend/apps/webui/routers/utils.py

@@ -1,6 +1,5 @@
 from fastapi import APIRouter, UploadFile, File, Response
 from fastapi import Depends, HTTPException, status
-from peewee import SqliteDatabase
 from starlette.responses import StreamingResponse, FileResponse
 from pydantic import BaseModel
 
@@ -10,7 +9,6 @@ import markdown
 import black
 
 
-from apps.webui.internal.db import DB
 from utils.utils import get_admin_user
 from utils.misc import calculate_sha256, get_gravatar_url
 
@@ -114,13 +112,15 @@ async def download_db(user=Depends(get_admin_user)):
             status_code=status.HTTP_401_UNAUTHORIZED,
             detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
         )
-    if not isinstance(DB, SqliteDatabase):
+    from apps.webui.internal.db import engine
+
+    if engine.name != "sqlite":
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
             detail=ERROR_MESSAGES.DB_NOT_SQLITE,
         )
     return FileResponse(
-        DB.database,
+        engine.url.database,
         media_type="application/octet-stream",
         filename="webui.db",
     )