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- sql_statements/5.1.16.txt: the kudos_ledger swap takes the applier advisory lock (KUDOS_APPLIER_LOCK) before it locks users. The applier claims ledger rows and then updates users, the reverse of the swap's order. The applier only tries that lock, so it skips its cycles until the swap commits and does not deadlock with it. - After the advisory lock, each lock wait of the swap ends after 500 ms, below deadlock_timeout. A request that inserts a posting before it updates users can still form a lock cycle with the swap. The swap then fails with lock_not_available before the deadlock check runs in the request, so the request continues and the file is rerun. The file stops with an error when deadlock_timeout is 500 ms or less. - archive evict runs evict_statistics_dumps. It keeps the dumps of statistics units that are not dropped, because their raw rows are still online. It sets the object_key of each evicted unit to NULL, also after a failed batch. The command exits 1 when the kept dumps hold the tier above the budget. KudosArchive.enforce_budget takes kept_keys for this. - The tick does not clear the key of a missing statistics dump without a trace. A dumped unit whose object is missing goes to dump_failed and is dumped again on the next tick. A detached one blocks with archive object missing. - A dropped statistics unit keeps the key of a missing object, so archive audit reports the loss on every run. - _check_statistics_dumps runs with the currency check before the detach and before the drop. The raw rows of a unit stay online when its dump was removed after the last listing. - archive object missing is waivable for statistics. retention unblock --waive-dump refuses a unit of a detached partition, so the drop after a waiver starts from an attached partition. - A dataset with an attached partition that has dropped catalog units does not make a transition, and the tick returns blocked with RESTORED_PARTITION_REFUSAL. Such a partition was restored under its original name, and the catalog does not describe its rows. retention_health lists restored_partitions, and the gauge horde.kudos.retention.restored_partitions exports the count. - Tests: the migration tests run the swap against a concurrent applier cycle and a concurrent request, and against a short deadlock_timeout. The retention tests cover a vanished dump in each state and an eviction that keeps online dumps. A further test restores a dropped partition under its name. The reconcile test expects dump_failed for a vanished dump, and the rehearsal grace test expects the restored-partition block after a future reference time drops the current week. - Docs: the how-to's swap, eviction, missing object, rehearsal and rollback text, the reference's block reason, eviction, reconcile, metric, log and health tables, and the explanation's diagnosis table.