Long schema

One row per asset and timestamp. The assets are stacked in a base column, and each field (open, close, base_volume…) is a single column shared by all assets. There is no index: close_ts is a regular column.

Use it when you filter or group by asset, or when you work with many assets. Adding an asset adds rows, not columns. This is the long, tidy format that most analysis tools expect.

See how to load it in Loading data.