# Initial Import Report

Date: 2026-05-15

## Summary

- Source directory: `dataset/bags`
- Imported session directory: `raw/sessions`
- Import mode: `hardlink`
- Source bags found: 17
- Sessions imported: 17
- Source data size: 76G
- Imported raw session apparent data size: 76G
- Extra disk used by raw session bags before Git LFS object storage: near zero, because `bag.bag` files are hardlinks to preserved source bags
- Original source bags preserved: yes
- Git LFS configured: yes
- `metadata/sessions.parquet` rows: 17
- `metadata/topics.parquet` rows: 0

## Session Import Status

All matching files named `odom_dataset_YYYYMMDD_HHMMSS.bag` from `dataset/bags` were imported into `raw/sessions/<session_id>/` using hardlinks.

Each session has:

- `bag.bag`
- `bag.bag.sha256`
- `metadata.yaml`

## Topic Scan Status

Topic scanning is blocked in the current shell because the ROS `rosbag` Python package is not available.

Observed error:

```text
Failed to import rosbag. Please source your ROS environment first, for example:
source /opt/ros/noetic/setup.bash
```

No fake `topic_summary.yaml` files were generated. That is intentional. A missing scan is better than false metadata.

## Next Required Step

Use a ROS environment, then run:

```bash
source /opt/ros/noetic/setup.bash
conda activate odom_dataset
make scan-all
make build-index
make validate
git add .
git commit -m "scan rosbag topics"
```