Integrate evmonly executor with giga store

[codchen]

Summary

• make the evmonly executor store-only: every block opens a giga snapshot and commits through CommitStateChanges
• require a store-specific NamedChangeSetEncoder and preserve storage-prefix clears
• add the loadtest MemoryStore implementation over the existing immutable StateReader
• encode state changes directly into typed, fixed-width NamedChangeSet key/value pairs with contiguous backing allocations
• apply direct pairs without an RLP encode/decode round trip
• retain historical state through per-block version slabs and linked version nodes, avoiding independently growing slices and duplicate account-touch indexes
• keep result sinks post-commit and preserve cleanup/error behavior across sequential and OCC execution

Why

The evmonly executor now has one persistence model: a giga Store. The concrete store implementation can vary, but execution no longer has a separate non-giga state path.

The first loadtest adapter wrapped the complete native changeset in RLP and decoded it immediately inside CommitStateChanges. The direct format removes that redundant work while continuing to exercise the real giga interface.

Loadtest

Configuration: 400 blocks, 1,000 transfers/block, one ordered block worker, 12 executor workers, discard result sink.

The optimized implementation stabilizes around 227k-228k tx/s across repeated runs:

• 226,198 tx/s
• 228,323 tx/s
• 227,601 tx/s

An 800-block profiled run completed at 227,173 tx/s. In the final CPU profile, EncodeMemoryStoreChangeSet and CommitStateChanges each represented about 0.04% of sampled CPU, so further parallel encoding or pooling is not expected to produce a sizable end-to-end gain. This is effectively back at the earlier non-giga loadtest throughput of about 229k tx/s.

Validation

• go test ./giga/... ./sei-db/state_db/giga
• go test -race ./giga/evmonly/...
• go vet ./giga/evmonly/... ./sei-db/state_db/giga
• touched Go files pass gofmt -s -l and goimports -l
• git diff --check

The full-tree goimports -l . reports pre-existing untouched generated and test files.

[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	Aug 7, 2026, 7:42 AM

[codecov]

Codecov Report

❌ Patch coverage is 79.91968% with 100 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.92%. Comparing base (a8f5cd1) to head (1a66532).

Files with missing lines	Patch %	Lines
giga/evmonly/memory_store.go	81.29%	44 Missing and 31 partials ⚠️
giga/evmonly/cmd/evmonly-loadtest/state.go	0.00%	20 Missing ⚠️
giga/evmonly/giga_store.go	90.47%	2 Missing and 2 partials ⚠️
giga/evmonly/occ.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3864      +/-   ##
==========================================
- Coverage   61.74%   60.92%   -0.82%     
==========================================
  Files        2381     2289      -92     
  Lines      201667   191643   -10024     
==========================================
- Hits       124513   116766    -7747     
+ Misses      66074    64601    -1473     
+ Partials    11080    10276     -804     

Flag	Coverage Δ
sei-chain-pr	79.49% <79.91%> (?)
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
giga/evmonly/cmd/evmonly-loadtest/config.go	67.14% <100.00%> (+0.32%)	⬆️
giga/evmonly/cmd/evmonly-loadtest/pipeline.go	71.91% <100.00%> (+1.68%)	⬆️
giga/evmonly/cmd/evmonly-loadtest/sinks.go	75.71% <100.00%> (-0.23%)	⬇️
giga/evmonly/executor.go	87.68% <100.00%> (-0.05%)	⬇️
giga/evmonly/state.go	89.00% <100.00%> (+0.57%)	⬆️
giga/evmonly/types.go	81.81% <ø> (ø)
giga/evmonly/occ.go	81.72% <87.50%> (ø)
giga/evmonly/giga_store.go	90.47% <90.47%> (ø)
giga/evmonly/cmd/evmonly-loadtest/state.go	70.10% <0.00%> (-18.21%)	⬇️
giga/evmonly/memory_store.go	81.29% <81.29%> (ø)

... and 94 files with indirect coverage changes

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