fix: include data_substrate TTL compaction filter fix

[thweetkomputer]

Context

Includes the Data Substrate fix from eloqdata/tx_service#539 so EloqDoc CI can validate the corrected RocksDB/RocksDB-Cloud TTL compaction-filter value parsing.

This PR intentionally points at the dependency PR head (93ac9eb) and must remain draft until the dependency is merged. After tx_service#539 is squash-merged, refresh the gitlink to the resulting commit on tx_service/main before merging this PR.

Behavior before and after

Before, EloqDoc referenced Data Substrate 9125a4c, before the corrected DSS RocksDB TTL value-header decoder.

After, EloqDoc references 93ac9eb, where the filter decodes the version timestamp and TTL consistently, uses a per-compaction timestamp snapshot, and is covered by the RocksDB Cloud S3 unit-test configuration.

Implementation

• Update only src/mongo/db/modules/eloq/data_substrate from 9125a4c to 93ac9eb.
• Depend on tx_service#539 for the TTL implementation and unit-test changes.
• Because EloqDoc's previous pointer predates the dependency PR base, this bump also includes tx_service #535 (compile-warning fixes) and #536 (removal of DynamoDB and Bigtable backends).

Design decisions and alternatives

This is a dependency-validation PR against the open tx_service branch. It does not duplicate the storage-engine change in EloqDoc. The final parent gitlink will be updated after the dependency is merged, in accordance with the repository merge policy.

Test plan

• EloqDoc build/integration tests: not run locally; delegated to this PR's CI.
• git diff --check origin/main...HEAD: passed.
• tx_service#539 unit-tests on amd64 and arm64: passed.
• tx_service#539 Cloud S3 suite: 52/52 passed on both architectures, including TTLCompactionFilter-Test.
• tx_service#539 log-service, clang-format, and cpplint checks: passed.

Risk assessment

The gitlink currently targets an open PR head rather than a commit reachable from tx_service/main; do not merge this PR in its current form. The dependency range also removes the retired DynamoDB and Bigtable backends, so reviewers should confirm EloqDoc has no remaining build-time dependency on those options. Runtime risk from #539 is limited to the RocksDB/RocksDB-Cloud TTL compaction path.

Rollback plan

Revert this PR, restoring the Data Substrate pointer to 9125a4c.

Reviewer guide

1. Review and merge tx_service#539 first.
2. Confirm EloqDoc CI passes with the removal of the retired storage backends.
3. Verify the TTL compaction filter parses [encoded version timestamp][TTL][record] and its Cloud S3 unit test runs on both architectures.
4. Before merging this parent PR, update the gitlink to the squash-merge commit and confirm it is reachable from tx_service/main.

Follow-up work

Refresh the submodule pointer after tx_service#539 is merged.

Summary by CodeRabbit

• Chores
  • Updated an internal data component to a newer revision.
  • No user-visible features or behavior changes were introduced.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 825c4477-4a3b-4aa7-9ca4-5dedbd5221d4

📥 Commits

Reviewing files that changed from the base of the PR and between 1b43878 and 320bb0a.

📒 Files selected for processing (1)

• src/mongo/db/modules/eloq/data_substrate

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Walkthrough

The pull request updates the data_substrate subproject reference to commit 63db0ecbe3cd04e23282aa61af3961491647bddf.

Changes

Data substrate update

Layer / File(s)	Summary
Submodule pointer update src/mongo/db/modules/eloq/data_substrate	The subproject reference changes to commit 63db0ecbe3cd04e23282aa61af3961491647bddf.

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

Possibly related PRs

• eloqdata/eloqdoc#318: Updates the same submodule pointer without source-code changes.
• eloqdata/eloqdoc#381: Updates the same submodule pointer.
• eloqdata/eloqdoc#403: Updates the same submodule reference.

Suggested labels: trigger-ci

Suggested reviewers: liunyl

Poem

I hop past the pointer, precise and bright,
A new commit lands just right.
No source files change, no bugs to chase,
The substrate moves to a newer place.
— A rabbit 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the data_substrate gitlink update for the TTL compaction filter fix.
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/bump-data-substrate-ttl-compaction-filter

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