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perf(archiver): avoid loading full blocks during checkpoint ingestion - #439
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The archiver ingests each checkpoint inside one write transaction, so ingestion time directly delays every read queued behind it. `getPreviousCheckpointBlock` loaded the previous checkpoint's last block as a full `L2Block` (one store round trip and a deserialization per tx effect), although `validateCheckpointBlocks` only needs its number, checkpoint number, index within the checkpoint and archive. It now reads the lightweight block data instead. `LogStore.addLogs` also serialized the same tx hash once per log and the same block hash once per log in the block. Both are now serialized once and passed to `encodeValue` pre-serialized; the stored byte format is unchanged.
This was referenced Oct 9, 2026
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Part of A-1817. Redoes AztecProtocol/aztec-packages#25279 (closed after the repo split).
The archiver ingests each checkpoint inside one
transactionAsync, so ingestion time directly delays any read queued behind it, notablygetLogsByTags. The biggest cost wasgetPreviousCheckpointBlockloading the previous checkpoint's last block as a fullL2Block(one native round trip and deserialization per tx effect) when validation only reads four header-level fields.Approach
getPreviousCheckpointBlockreads the lightweight block data and returns only the chaining info (number,checkpointNumber,indexWithinCheckpoint,archive).L2Blocksatisfies that shape, so validation is unchanged.LogStore.addLogsserializestxHashonce per tx andblockHashonce per block and passes them pre-serialized to the codec. The stored byte format is unchanged.The original PR measured per-checkpoint ingestion dropping ~42-49% (36 txs/block: ~82 → ~42ms; 120 txs/block: ~246 → ~142ms).