Fix type issues

src/scitacean/client.py

@@ -775,12 +775,12 @@ def query_datasets(
             )
         """
         # Use a pydantic model to support serializing custom types to JSON.
-        params_model = pydantic.create_model(
+        params_model = pydantic.create_model(  # type: ignore[call-overload]
             "QueryParams", **{key: (type(field), ...) for key, field in fields.items()}
         )
         params = {"fields": params_model(**fields).model_dump_json()}
 
-        limits = {}
+        limits: dict[str, Union[str, int]] = {}
         if order is not None:
             limits["order"] = order
         if limit is not None:

tests/client/query_client_test.py

@@ -1,14 +1,18 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright (c) 2024 SciCat Project (https://github.com/SciCatProject/scitacean)
 
+from typing import Union
+
 import pytest
 from dateutil.parser import parse as parse_datetime
 
 from scitacean import Client, DatasetType, RemotePath, model
 from scitacean.testing.backend import skip_if_not_backend
 from scitacean.testing.backend.config import SciCatAccess
 
-UPLOAD_DATASETS = {
+UPLOAD_DATASETS: dict[
+    str, Union[model.UploadDerivedDataset, model.UploadRawDataset]
+] = {
     "raw1": model.UploadRawDataset(
         ownerGroup="PLACEHOLDER",
         accessGroups=["uu", "faculty"],