Function split_row 

fn split_row(
    area: &str,
    path: &str,
    config: &LoadedConfig,
) -> (Vec<String>, String)

The instance names and the key’s own name for one row.

A name can contain dots - an account display name, an org, a project, a model slug, an env var - so the split cannot be done on separators alone. The config’s own instance names say where a name ends, and the catalogue’s table segments say where a repeated key’s own name begins.