SpaceUserMembership

空间成员关系记录，对应 spacesUsers

{
    "id": 1,
    "userId": 123,
    "spaceName": "default",
    "createdAt": "2019-08-24T14:15:22.123Z",
    "updatedAt": "2019-08-24T14:15:22.123Z"
}