Function import_conduit_original 

async fn import_conduit_original(
    services: &Services,
    owners: Option<&Arc<Map>>,
    source: &MediaSource,
    depth: u8,
    length: u8,
    key: &[u8],
    value: &[u8],
) -> Result<bool>

Imports one servernamemediaid_metadata entry, returning whether an original was imported (false = skipped). The skip/abort contract is decided in read_conduit_original.