fix(auth): drop reserved usernames loaded from auth config (#3727)

app.py

@@ -56,7 +56,7 @@ from core.constants import (
 )
 from core.database import SessionLocal, ApiToken
 from core.middleware import SecurityHeadersMiddleware, is_cors_preflight
-from core.auth import AuthManager
+from core.auth import AuthManager, normalize_known_username
 from core.exceptions import (
     SessionNotFoundError, InvalidFileUploadError,
     LLMServiceError, WebSearchError,
@@ -228,8 +228,16 @@ if AUTH_ENABLED:
         try:
             rows = db.query(ApiToken).filter(ApiToken.is_active == True).all()
             for r in rows:
+                owner_key = normalize_known_username(auth_manager.users, getattr(r, "owner", None))
+                if not owner_key:
+                    logger.warning(
+                        "Ignoring active API token '%s' for unknown auth user '%s'",
+                        getattr(r, "id", ""),
+                        getattr(r, "owner", None),
+                    )
+                    continue
                 scopes = [s.strip() for s in (getattr(r, "scopes", "") or "chat").split(",") if s.strip()]
-                new_map[r.token_prefix].append((r.id, r.token_hash, getattr(r, "owner", None), scopes))
+                new_map[r.token_prefix].append((r.id, r.token_hash, owner_key, scopes))
         finally:
             db.close()
         _token_cache.clear()