Disclosed herein is a data structure which includes a sequence of events, each event associated with a sequence number indicating a temporal position of an event within the sequence of events; one or more read-offsets, each read-offset associated with a consumer, wherein each read-offset indicates a sequence number up to which a consumer has read events within the sequence of events; and at least one snapshot which represents events with sequence numbers smaller than the smallest read-offset in a compacted form. Disclosed herein is also a computer-implemented method of maintaining the data structure. Disclosed herein is a computer-implemented method, wherein the method is performed on a sequence of events accessible by a plurality of consumers, each event associated with a sequence number indicating a temporal position of an event within the sequence of events, each consumer associated with a read-offset indicating the sequence number up to which the consumer has read events within the sequence of events, the method includes determining a smallest read-offset of all read-offsets; compacting events with sequence numbers smaller than the smallest read-offset into a snapshot; and replacing the events with sequence numbers smaller than the smallest read-offset with the snapshot. Disclosed herein are corresponding computer-readable media and computing systems.