[zlacfzy]

Initialize the storage-update timer before processing trie updates, preventing zero-time durations from overflowing state timing statistics. Report block import duration and throughput only through ExecuteStats.reportMetrics, so each imported block contributes one sample to chain/inserts and chain/mgasps.

Validation:

• Focused state tests: TestUpdateLeaks, TestIntermediateLeaks, and TestStorageDirtiness.
• In-memory reproductions: empty-state timing stays finite across repeated calls; importing one block records one sample in each import metric.
• make all, repository lint (including cmd/keeper), generated-file/module hygiene checks, and forbidden-dependency checks all passed.

Tests were limited to the affected logic; the full test suite was not run.

[hashdit-bot]

Pull Request Review

This PR initializes the state storage-update timer before trie processing, preventing invalid or overflowing timing statistics when processing completes immediately. It also removes duplicate block import duration and throughput metric updates from ProcessBlock, leaving ExecuteStats.reportMetrics as the single reporting path.

Sensitive Content

No sensitive content detected.

Security Issues

No serious security issues detected.

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