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* Use a sequence to generate AS transaction IDs, drop `last_txn` AS state (#12209)Nick Mills-Barrett2022-04-011-0/+1
Switching to a sequence means there's no need to track `last_txn` on the AS state table to generate new TXN IDs. This also means that there is no longer contention between the AS scheduler and AS handler on updates to the `application_services_state` table, which will prevent serialization errors during the complete AS txn transaction.