import migration explanation

Author: wei-qlu

python/CHANGELOG.md

@@ -10,6 +10,17 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 #### Data Import API in SiftClient
 The `sift_client` module now exposes a data import API supporting CSV, Parquet, TDMS, and HDF5. With this addition, all features previously available only in `sift_py` are now available in `sift_client`, which remains the recommended interface for new development. `sift_py` (deprecated since [v0.10.0](#v0100---january-30-2026)) continues to work and ship in this release.
 
+Migrating from `sift_py`: the per-format upload services are replaced by a single `client.data_imports.import_from_path` method. Where `sift_py` required hand-building a config object for every import, `sift_client` auto-detects it from the file extension. Use the new public `client.data_imports.detect_config(...)` first if you need to inspect or patch the result. The call returns a Job you can optionally wait on.
+
+```python
+# sift_py
+csv_service = CsvUploadService(rest_conf)
+csv_service.upload("data.csv", csv_config)
+
+# sift_client
+client.data_imports.import_from_path("data.csv", asset=my_asset)
+```
+
 #### Test Result Logging
 Test result create and update events can now be optionally written to a `.jsonl` log file during a test run, then replayed against the Sift API later via the new `import_test_result_log` script.