go bench receipts parquet vs pebble

[jewei1997]

Summary

• Add benchmarks comparing pebble vs parquet receipt store write performance across realistic workloads (100 blocks with 10-100 receipts per block)
• Optimize parquet WAL by batching writes per block instead of per receipt, reducing WAL overhead by ~50%
• Switch WAL encoding from JSON to binary for faster serialization
• Use realistic ERC20 Transfer receipts in benchmarks (3 topics, 32-byte amount data, gas fields)

Test plan

• Run benchmarks with go test -tags duckdb -bench='BenchmarkReceiptWriteAsync' -benchtime=3x -run='^$' ./sei-db/ledger_db/receipt
• Verify parquet store tests pass with go test -tags duckdb ./sei-db/ledger_db/receipt

Benchmark Results

Backend	1k receipts	10k receipts
pebble-async	617k receipts/s	1,340k receipts/s
parquet-async	383k receipts/s	763k receipts/s
parquet-no-wal	706k receipts/s	1,044k receipts/s

The parquet-no-wal variant (bypasses WAL for benchmarking) shows parquet's raw write performance is competitive with pebble. WAL batching improved
parquet-async throughput by ~1.5-2x compared to per-receipt WAL writes.

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 3, 2026, 8:58 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.08%. Comparing base (432bd51) to head (75dd167).

❗ There is a different number of reports uploaded between BASE (432bd51) and HEAD (75dd167). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (432bd51)	HEAD (75dd167)
sei-tendermint	1	0

Additional details and impacted files

@@                  Coverage Diff                  @@
##           parquet-receiptdb    #2794      +/-   ##
=====================================================
- Coverage              56.65%   47.08%   -9.57%     
=====================================================
  Files                   2019     1951      -68     
  Lines                 165709   160030    -5679     
=====================================================
- Hits                   93880    75349   -18531     
- Misses                 63597    78152   +14555     
+ Partials                8232     6529    -1703     

Flag	Coverage Δ
sei-chain	41.64% <ø> (+<0.01%)	⬆️
sei-cosmos	48.12% <ø> (-0.01%)	⬇️
sei-db	68.72% <ø> (ø)
sei-tendermint	?

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