Standalone purger support

[githubzilla]

Summary by CodeRabbit

• Chores
  • Updated internal storage and transaction submodule references for maintenance.
  • Added backend purger components to the datastore build (no user-facing changes).
• Tests
  • Introduced a purge periodicity configuration in test settings.
• Notes
  • No changes to public APIs, user workflows, performance guarantees, or required user actions.

[coderabbitai]

Walkthrough

Updated two storage/eloq submodule pointers, added two purger source files to the ELOQ RocksDB cloud build, and introduced a RocksDB cloud purger periodicity config in mysql-test. No public API declarations were modified.

Changes

Cohort / File(s)	Summary of Changes
Submodule pointer updates storage/eloq/store_handler, storage/eloq/tx_service	Advanced submodule references (store_handler: e0e4ef07c3a9cab621adc16c4edbf1f8935735db → 6c5604a002e58aad45dfebd09b51ae150195b330; tx_service: 16f3cf1d6aabb763b1e8d2a71f0b06385a4631e3 → 575b5609f555e4310a5a7a227b90fcac8e1103a7). Metadata-only updates; no code/API changes in this repo.
Build: add purger sources storage/eloq/CMakeLists.txt	Appended purger_event_listener.cpp and purger_sliding_window.cpp to the ELOQ RocksDB cloud S3 datastore source list (MYELOQ_SOURCES).
Test config: purger periodicity mysql-test/include/eloq_kv_dss.cnf	Added eloq_dss_rocksdb_cloud_purger_periodicity_secs = 30 under [mysqld] to set purger periodicity for RocksDB cloud DSS in tests.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  participant TestHarness as Test Harness / Scheduler
  participant MySQL as mysqld (test)
  participant Purger as Purger (purger_* files)
  participant Store as RocksDB Cloud Store

  Note over TestHarness,MySQL: periodic trigger (config = 30s)
  TestHarness->>MySQL: start/poll (every 30s)
  MySQL->>Purger: invoke purge cycle
  Purger->>Store: enumerate expired entries (sliding window)
  alt expired entries found
    Purger->>Store: delete expired entries
    Store-->>Purger: deletion results
  else none found
    Store-->>Purger: no-op
  end
  Purger-->>MySQL: report status

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• update subm #119 — Updates the storage/eloq/store_handler submodule pointer (same component).
• update submodule #122 — Modifies storage/eloq submodule pointers (store_handler and tx_service).
• Fix slow open rocksdb cloud when db is large #120 — Updates the storage/eloq/store_handler submodule pointer (metadata-only).

Suggested reviewers

• liunyl
• MrGuin

Poem

I hopped through commits, nudged two submodule seeds,
Two purgers join the build to tend expired weeds.
Every thirty seconds the cloud garden clears,
I munch CI carrots and applaud tiny gears. 🥕

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title "Standalone purger support" is concise and directly reflects the primary changes in the diff—adding purger-related source files, a purger periodicity configuration, and related submodule updates to enable a standalone purger. It clearly communicates the main intent without unnecessary detail or vague wording. Teammates scanning PR history should understand the primary purpose from this title.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between e5a6700 and 1863ea0.

📒 Files selected for processing (1)

• storage/eloq/CMakeLists.txt (1 hunks)

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

• storage/eloq/CMakeLists.txt

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