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Doug Lauder
f0b2a36dbc
* Refactor shared channel membership sync to use ChannelMemberHistory (MM-67616) Replace the trigger-time membership sync mechanism with a cursor-based approach using ChannelMemberHistory, aligning membership sync with the established pattern used by posts and reactions. Previously, membership changes were built into SyncMsg at trigger time and sent via a separate TopicChannelMembership code path. This meant removals were lost if a remote was offline, since ChannelMembers hard-deletes rows. Now, membership changes are fetched from ChannelMemberHistory at sync time using the LastMembersSyncAt cursor, detecting both joins and leaves reliably. The data flows through the normal syncForRemote pipeline alongside posts, reactions, and other sync data. Key changes: - Add GetMembershipChanges store method for ChannelMemberHistory - Add fetchMembershipsForSync and sendMembershipSyncData to sync pipeline - Replace HandleMembershipChange with NotifyMembershipChanged (trigger-only) - Remove conflict detection (idempotent add/remove resolves naturally) - Remove per-user membership tracking (GetUserChanges, UpdateUserLastMembershipSyncAt) - Add MembershipErrors to SyncResponse - Keep TopicChannelMembership receiver for one release cycle (backward compat)