Groups
A group is who a group-scoped event is about. A static group keeps a list you add to; a dynamic group holds whoever's attributes contain its filter, so nobody keeps it up. Beside the groups somebody keeps are temporary lists, picked by a person for one send: you can see them, but a key cannot change one and an event cannot name one. In the Standard lens a group is, for example, “Group A”.
PATCHUpdate a group
Requires groups:write. Send only what changes — except attributes, which is replaced whole. kind and member_kind never change: make a new group instead. A body that changes nothing is refused.
200 with the updated group. 409 on a temporary list, which a key cannot change.
One group: the same fields in every pack. Press Response on the sample to see one whole.
On failure the body is { error, code } instead.