pub const ROOM_INVITATIONS: &str = "room_invitations";Expand description
Invitation credentials this VTA has consumed by joining a room
(rooms/keys/welcome), keyed room-vic:<credentialId>.
Separate from ROOM_GROUPS because it outlives them: a member who leaves a
room discards the group, and the consumed-invitation record must survive that
or the same invitation would let them be re-added without a fresh one. Single
use means single use.