# 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; 385 direct Standard MP4 files
- `pre_standard/archive` — 128 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.

The dated `Standard_Time_Lapses/Provenance/2026-08-27/` layer contains a
27-row, 15-field relationship sidecar and five nested noncanonical InShot
derivatives. Neither the sidecar nor those derivative payloads define a Viewer
configuration or contribute to the 513 active rows.

```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. Before merge,
both tiers must 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 385 rows.
2. `pre_standard/archive` contains exactly 128 rows.
3. No provenance video, including the five dated InShot derivatives, 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.
8. The 27 relationship rows resolve against the exact immutable
   `source_hub_revision`, while remaining outside both Viewer configurations.

## Split terminology

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