delete
public Unit deleteMessagesForMeByTimestamp(DeleteMessagesForMeByTimestampParams params, ErrorHandler handler)
Deletes messages in this sub-channel before the specified timestamp (for the current user).
Overrides the base channel implementation to handle sub-channel specific deletion.
The behavior depends on DeleteMessagesForMeByTimestampParams.policy:
MessageOperationPolicy.LOCAL: Deletes local messages only
MessageOperationPolicy.LOCAL_REMOTE: Deletes both local and remote messages
Parameters
params
Parameters including timestamp and operation policy
handler
Error callback; null error indicates success