chore: normalize tsfile dataset metadata

README.md

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+---
+license: apache-2.0
+task_categories:
+- robotics
+tags:
+- LeRobot
+- robotics
+- timeseries
+- tsfile
+modality:
+- timeseries
+pretty_name: record-test_3 TsFile
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/record_test_3_train.tsfile
+size_categories:
+- 10K<n<100K
+---
+
+# record-test_3 TsFile
+
+This dataset is a TsFile conversion of the LeRobot dataset
+[`sunparticle/record-test_3`](https://huggingface.co/datasets/sunparticle/record-test_3).
+The source dataset was created with [LeRobot](https://github.com/huggingface/lerobot)
+and is licensed under `apache-2.0`.
+
+## Dataset Details
+
+- Source dataset: [`sunparticle/record-test_3`](https://huggingface.co/datasets/sunparticle/record-test_3)
+- Source format: LeRobot `v2.1`
+- Robot type: `so101_follower`
+- Modalities: Time-series robot state and action data
+- Source task: `place crown on capybara`
+- Split: `train`
+- Episodes: `40`
+- Frames / rows: `17403`
+- Tasks: `1`
+- Sampling rate: `30 fps`
+- Source videos: `40`
+- Converted data file: `data/record_test_3_train.tsfile`
+
+## TsFile Layout
+
+The conversion writes one TsFile table for the train split:
+`record_test_3_train`.
+
+- `Time` is the TsFile time column in milliseconds.
+- `episode_index` and `task_index` are TAG columns.
+- `frame_index` and `sample_index` are scalar FIELD columns.
+- `action_0` through `action_5` are flattened action FIELD columns.
+- `observation_state_0` through `observation_state_5` are flattened observation FIELD columns.
+
+Vector column flattening preserves the source column name, replaces `.` with
+`_`, and appends the element index. For example, `observation.state` becomes
+`observation_state_0` through `observation_state_5`.
+
+## Conversion Notes
+
+- `Time = round(timestamp * 1000)` and restarts per episode.
+- The source `timestamp` column is dropped because it is represented by `Time / 1000` seconds.
+- The source `index` column is renamed to `sample_index`.
+- No numeric time-series rows are dropped; the converted TsFile has `17403` rows.
+- Source `meta/` files are mirrored, with `meta/info.json` updated to describe the converted TsFile artifact.
+- Videos are not uploaded here. The source video feature `observation.images.front`
+  and the `videos/` tree remain in the original dataset:
+  <https://huggingface.co/datasets/sunparticle/record-test_3/tree/main/videos>.
+
+## Read Example
+
+Use the Apache TsFile SDK or TsFile tools to read:
+
+```text
+data/record_test_3_train.tsfile
+```
+
+For episode-level filtering, query the table with the TAG column, for example
+`WHERE episode_index = 0`.