fix: pip install database save issue

backend/open_webui/env.py

@@ -221,6 +221,9 @@ if FROM_INIT_PY:
             else:
                 shutil.copy2(item, dest)
 
+        # And rename the old directory to _open_webui/data
+        DATA_DIR.rename(DATA_DIR.parent / "_open_webui" / "data")
+
     DATA_DIR = Path(os.getenv("DATA_DIR", OPEN_WEBUI_DIR / "data"))