BoardMemberMutationView
board_idstring<uuid>required
user_idstring<uuid>required
added_atstring<date-time>required
BoardMemberMutationView
{
"board_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
"user_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
"added_at": "2024-07-29T15:51:28.071Z"
}