Function insert 

pub async fn insert(
    pool: &PgPool,
    source_version_id: Uuid,
    parent_node_id: Option<Uuid>,
    kind: NodeKind,
    name: &str,
    order_index: i32,
) -> Result<Uuid>

Insert a node, returning the newly-minted id.

Errors

Returns crate::error::StoreError::ForeignKeyViolation if source_version_id or parent_node_id are unknown.