perf(clickhouse): add task_events_v2 inserted_at minmax index

[carderne]

Adds a minmax skip index on task_events_v2.inserted_at (idx_inserted_at_projector) to support bounded, closed time-window scans of the source table.

ADD INDEX only defines the index for newly written parts; existing parts are not materialized. New parts (e.g. after the next UTC partition boundary) will carry it.

Split out ahead of the larger log-search-v2 work so the index can be deployed independently for read-path testing.

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Latest commit: 800b05e

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Reviewing files that changed from the base of the PR and between 7c7ea0f and 800b05e.

📒 Files selected for processing (1)

• internal-packages/clickhouse/schema/038_add_task_events_inserted_at_index.sql

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

• internal-packages/clickhouse/schema/038_add_task_events_inserted_at_index.sql

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• GitHub Check: webapp / 🧪 Unit Tests: Webapp (2, 12)
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Walkthrough

Adds a Goose migration that creates the idx_inserted_at_projector minmax index on trigger_dev.task_events_v2.inserted_at for new parts. The downgrade migration conditionally drops the index. Existing parts are not materialized.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the index, scope, purpose, and deployment reason, but it omits the required issue, checklist, testing, changelog, and screenshots sections.	Add the template sections, including the issue reference, completed checklist, testing steps, changelog entry, and screenshots or an explicit not-applicable note.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title is concise and clearly identifies the ClickHouse performance change: adding a minmax index on task_events_v2.inserted_at.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch perf/task-events-inserted-at-index

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[devin-ai-integration]

Devin Review found 1 potential issue.