Project counters missing indexes

[hlbmtc]

Summary by CodeRabbit

• Performance
  • Added database indexes to improve forecast, question aggregation, and staff-user lookups.
  • Improved project forecaster counting by excluding staff accounts and accurately combining forecast sources.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 3a865f89-8d4b-487c-a7af-a471304c0d69

📥 Commits

Reviewing files that changed from the base of the PR and between bdc40e0 and c39aee3.

📒 Files selected for processing (7)

• posts/migrations/0033_postusersnapshot_posts_postuser_forecasted_idx.py
• posts/models.py
• projects/models.py
• questions/migrations/0038_question_idx_q_id_incl_default_agg.py
• questions/models.py
• users/migrations/0024_user_user_is_staff_idx.py
• users/models.py

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

The change adds partial and covering database indexes for forecast, staff, and question aggregation queries. It also rewrites project forecaster counting to exclude staff users and deduplicate users through unioned queries.

Changes

Query performance updates

Layer / File(s)	Summary
Snapshot and staff indexes posts/models.py, posts/migrations/..., users/models.py, users/migrations/...	Adds partial indexes for forecasted post-user snapshots and staff user IDs.
Forecaster count query rewrite projects/models.py	Excludes staff users and unions default-project and secondary-project snapshot queries before counting unique forecasters.
Question aggregation covering index questions/models.py, questions/migrations/...	Adds a covering index for question IDs and default_aggregation_method.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to c39ae

The PR adds database indexes and updates internal project forecaster counting without any identified correctness, security, or availability issue; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: lsabor

Poem

A rabbit indexed snapshots with care

Staff IDs vanished from the query air
Forecasters joined in a tidy row
Question lookups gained a faster flow
“Hop!” said the rabbit, “the plans now glow”

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 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 main change: adding missing indexes that support project counter queries. It is concise and related to the changeset.
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/missing-user-indexes

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[github-actions]

Cleanup: Preview Environment Removed

The preview environment for this PR has been fully removed.

Resource	Status
🌐 Preview App	Deleted
🗄️ PostgreSQL Branch	Deleted
⚡ Redis Database	Deleted
🔧 GitHub Deployments	Removed
📦 Docker Image	Retained (auto-cleanup via GHCR policies)

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Cleanup triggered by PR close at 2026-08-31T14:11:11Z