PARTIAL SAVE: writes ONLY the 'Chat' field of TitlePublicConfigurationModel; all other v1/v2 fields stay untouched. Player chat - the catalog of persistent CHANNELS the title offers (world / announcement / group), plus direct-message settings, moderation rules and polling economics. A channel declares who SEES it (SegmentGate + ScheduleSpec) and who may WRITE to it (a second gate plus LimitSpec anti-spam: slow mode, daily cap); an announcement channel is simply one nobody passes the write gate of. A channel may be PARTITIONED by the player's language or country and sharded by capacity - the partition key is computed by the SERVER (language is validated against this title's Localization locales, country comes from IP), so the set of rooms is bounded by config and never by client input. Type=Group is the extension point for clans: membership comes from an external provider named in GroupSource, and no provider exists yet, so such a channel is currently hidden rather than shown empty. Messages themselves are NOT here - they live in the ChatMessages collection and expire by Retention.HistoryHours; only the hot tail is cached in Redis. Muting a player and reviewing reports are admin actions, not config.