chore: update data_substrate for brpc eventfd wakeup

[thweetkomputer]

Context

Consume the Data Substrate integration of the eventfd worker-wakeup support merged in eloqdata/brpc#25, through eloqdata/tx_service#540.

Changes

• Advance data_substrate to 207f289b1e2f0a6953cfe1bb1b0933838de2eeb2.
• That revision pins brpc master at c12822d4931a59a9c2cc42df061975e114e93590.

No EloqKV command behavior, data format, or user configuration changes are included.

Validation

git diff --check origin/main...HEAD
PASS

The full EloqKV build and integration suites are running in this PR's CI; they were not rerun locally for this pointer-only update.

Risk and rollback

The change affects worker idle waiting and shutdown when io_uring is enabled. Possible regressions include missed wakeups, shutdown hangs, or unsupported runner kernels. Non-io_uring helper processes retain the condition-variable path. Revert this PR to restore the previous data_substrate pointer.

Reviewer guide

Verify data_substrate at 207f289b1e2f0a6953cfe1bb1b0933838de2eeb2, then follow its brpc pointer to c12822d4931a59a9c2cc42df061975e114e93590.

Summary by CodeRabbit

• Chores
  • Updated the underlying data substrate to a newer version, including the latest fixes and improvements.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 031f3f3b-4ae5-4a37-b42d-f2a4f36cf9d8

📥 Commits

Reviewing files that changed from the base of the PR and between 08f1e53 and 167a82c.

📒 Files selected for processing (1)

• data_substrate

🚧 Files skipped from review as they are similar to previous changes (1)

• data_substrate

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Walkthrough

The PR updates the data_substrate submodule reference from commit 63db0ecbe3cd04e23282aa61af3961491647bddf to commit 39171c94549baf6d092ed4d24504fb94afd62785.

Changes

Submodule update

Layer / File(s)	Summary
Update data_substrate reference data_substrate	The submodule pointer now references commit 39171c94549baf6d092ed4d24504fb94afd62785.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• eloqdata/eloqkv#333 updates the data_substrate submodule pointer.
• eloqdata/eloqkv#482 updates the data_substrate submodule reference.
• eloqdata/eloqkv#549 updates the data_substrate submodule reference.

Suggested labels: trigger-ci

Suggested reviewers: liunyl, starrysky9959

Poem

A rabbit checks the pointer with care,
A newer substrate waits there.
One commit hops ahead,
The old hash leaves the thread,
Clean links in the burrowed lair.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the data_substrate update and its purpose for brpc eventfd wakeup support.
Description check	✅ Passed	The description explains the context, pointer changes, validation, risks, rollback, and reviewer focus, but omits several template sections.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/test-data-substrate-brpc-eventfd

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@data_substrate`:
- Line 1: Update the data_substrate gitlink to the intended commit
021556ba9c9fadb14ab6a2b5dfbff2425874f686 so the CMakeLists.txt build uses the
PR’s targeted Data Substrate revision; if
8d0f3258c4e533a33068437dfd7fca33c521f6a4 is intentional, instead retarget the PR
accordingly.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 89693543-a1f7-4997-94cd-4166b5572789

📥 Commits

Reviewing files that changed from the base of the PR and between dd05387 and eb40cfd.

📒 Files selected for processing (1)

• data_substrate