Groups and Mini-game Rooms live in memory only

Groups and Mini-game Rooms are never persisted: they exist only while their members are online. A Room is dissolved for everyone as soon as any member leaves or disconnects (no host promotion, no partial continuation), because Mini-game state lives only in the clients and a subset of players cannot resume it. Guilds and Factions, by contrast, are persistent. Keeping transient structures out of storage avoids stale-state cleanup and migrations for things players expect to be short-lived.

Consequences

• A server restart dissolves every Group and Room. This is accepted; Groups are not rebuilt on reconnect.