chore: import upstream snapshot with attribution

examples/python/using_index_values/README.md

@@ -0,0 +1,36 @@
+<!--[metadata]
+title = "Using index values"
+tags = ["DataFrame", "Server",]
+channel = "main"
+include_in_manifest = false
+-->
+
+## Querying at specific index values
+
+This example demonstrates how to use the `using_index_values` parameter to query
+a dataset at specific timestamps (or other index values). When you pass index
+values directly, only segments whose time range covers the requested values will
+return data -- segments that don't overlap are automatically excluded.
+
+Combined with `fill_latest_at=True`, this is useful for sampling data at specific
+points in time, such as evaluating the state of all recordings at a fixed set of
+timestamps.
+
+### Setup
+
+This example will launch the OSS server which will run on `localhost` with a random port.
+
+### Running
+
+Run the following commands
+
+```bash
+pip install -e examples/python/using_index_values
+python examples/python/using_index_values/using_index_values.py
+```
+
+or to run it via pixi/uv
+
+```bash
+pixi run py-build && pixi run uv run examples/python/using_index_values/using_index_values.py
+```