# Dataset Viewer Migration

## Goal

Expose canonical and Pre-Standard recordings as separate Hub configurations so
users do not mistake different acquisition/documentation eras for an official
machine-learning split.

## Current configuration

The release candidate defines:

- `canonical/archive` — default; 356 direct Standard MP4 files
- `pre_standard/archive` — 129 direct Pre-Standard MP4 files

Both configurations use explicit direct-file globs. The canonical glob does
not recurse into `Standard_Time_Lapses/Provenance/`, so supporting historical
videos cannot enter the canonical Viewer accidentally.

```yaml
configs:
- config_name: canonical
  default: true
  data_files:
  - split: archive
    path:
    - metadata.csv
    - Standard_Time_Lapses/*.mp4
- config_name: pre_standard
  data_files:
  - split: archive
    path:
    - Pre_Standard_Time_Lapses/metadata.csv
    - Pre_Standard_Time_Lapses/*.mp4
```

The two configurations share the same declared 29-field schema. Both tiers now
have complete core encoded-video metadata, stable IDs, content hashes, and byte
sizes. Historical descriptive and provenance uncertainty remains explicit in
the Pre-Standard tier.

## Merge criteria

Merge only after the pull-request preview confirms:

1. `canonical/archive` contains exactly 356 rows.
2. `pre_standard/archive` contains exactly 129 rows.
3. No provenance video is present in either configuration.
4. Every expected row contains its metadata.
5. Stored dimensions and byte sizes load as integers.
6. `has_audio` loads as a boolean.
7. Generated Parquet artifacts succeed for both configurations.

## Split terminology

`archive` describes repository membership. It is not a training or evaluation
recommendation. No official train/validation/test partition exists.