[rnegron]

Problem

• Engineering analytics reads that aggregate over a CI flag return a 500 whenever the stored CI views serve them, for example workflow_health.
• The weekly CI digest lost its slow PR workflows section to this error (run).

Changes

• Reads from the stored CI views cast is_merge_queue, is_rerun_copy and the other boolean flags back to UInt8.
• Materialization writes a UInt8 flag to Delta Lake as Int16, and ClickHouse rejects Int16 as an If condition.
• The cast happens on read, because a change to the view definition forces a full rebuild of both views.

How did you test this code?

• Not run: the endpoint against production data.

Test rationale: the parity test in test_materialized_ci.py now stores the flags as Int16, like production, and runs countIf over each flag. It fails with the production error before the fix.

Release status

• This change is behind a feature flag and is not available to users

Docs update

• None.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Agent: Claude Code, claude-opus-5-5

Skills: /writing-tests, /writing-code-comments, /writing-pr-descriptions

More context for AI agents

• Decisions: cast on read rather than in the view SQL, so no fingerprint change and no full rebuild.
• Follow-ups: Depot GetUsage also returns 500 for the digest; that is a vendor-side failure this PR does not touch.
• Read closely: _stored_select in logic/materialized_ci.py.

[trunk-io]

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[github-actions]

🤖 CI report

⚠️ Trunk lane — backend Python lane (py:product:engineering_analytics)

This PR is assigned to the backend Python lane (py:product:engineering_analytics). It runs backend Python tests and may merge in parallel with PRs in other lanes.

✅ Duplication (Python) — clean

New Python code duplication introduced by this branch. Fails at 70+ tokens in app code, or 150+ tokens when both copies live in test files. Advisory while the gate proves itself: extract a shared helper instead of copying.

✅ Duplication (TypeScript) — clean

New TypeScript code duplication introduced by this branch. Fails at 70+ tokens in app code, or 150+ tokens when both copies live in test files. Advisory while the gate proves itself: extract a shared helper instead of copying.