head
Returns a ChainHead pointing at the last appended entry for runId, or null if runId is unknown.
O(1) pointer-style access for hot-path consumers.
Return
JournalOutcome.Ok with ChainHead or null, or JournalOutcome.Err on failure.
Returns a ChainHead pointing at the last appended entry for runId, or null if runId is unknown.
O(1) pointer-style access for hot-path consumers.
JournalOutcome.Ok with ChainHead or null, or JournalOutcome.Err on failure.