# description
A named list of contacts (lst_…), used as a broadcast audience. GET /api/lists/:id adds member_count; other responses return the bare row.

# properties.member_count.description
How many contacts the list holds. Detail (GET one) responses only.

# properties.created_at.description
When the list was created, in Unix epoch milliseconds (UTC).

# properties.updated_at.description
When the list last changed, in Unix epoch milliseconds (UTC).