⚡ Bolt: Combine count queries in get_visit_statistics

[RohanExploit]

💡 What: Refactored get_visit_statistics in backend/routers/field_officer.py to calculate all visit metrics in a single database query using SQL aggregations.
🎯 Why: The original implementation executed 6 separate queries (5 counts, 1 avg) which scales poorly. Combining them eliminates redundant database round-trips.
📊 Impact: Reduces database queries from 6 to 1 per endpoint call, significantly improving latency and reducing database load.
🔬 Measurement: Verify by executing the /api/field-officer/visit-stats endpoint and checking the application logs or running the test suite PYTHONPATH=. pytest backend/tests/.

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PR created automatically by Jules for task 2447378373000461510 started by @RohanExploit

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Summary by cubic

Combined all visit metrics in get_visit_statistics into one SQL aggregate query, cutting 6 queries to 1 to speed up /api/field-officer/visit-stats.
No app code changes were introduced in the latest deployment-related commit.

^{Written for commit b4ab238. Summary will update on new commits.}

Summary by CodeRabbit

• Refactor
  • Optimized visit statistics database queries for improved performance and faster load times.

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[github-actions]

🙏 Thank you for your contribution, @RohanExploit!

PR Details:

• Title: ⚡ Bolt: Combine count queries in get_visit_statistics
• Number: ⚡ Bolt: Combine count queries in get_visit_statistics #493

Quality Checklist:
Please ensure your PR meets the following criteria:

• Code follows the project's style guidelines
• Self-review of code completed
• Code is commented where necessary
• Documentation updated (if applicable)
• No new warnings generated
• Tests added/updated (if applicable)
• All tests passing locally
• No breaking changes to existing functionality

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[coderabbitai]

📝 Walkthrough

Walkthrough

The get_visit_statistics function in the field officer router has been refactored to consolidate multiple database queries into a single aggregate query. The new implementation retrieves all statistics metrics (total visits, verified visits, geofence status, unique officers, and average distance) in one database round trip, with appropriate type conversions and rounding applied to the results.

Changes

Cohort / File(s)	Summary
Database Query Optimization backend/routers/field_officer.py	Refactored get_visit_statistics to replace multiple separate metric queries with a single aggregate query that returns labeled columns for all statistics, reducing database round trips and improving query efficiency.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• ⚡ Bolt: optimize database queries and api response caching #480: Applies the same aggregate query consolidation pattern to escalation statistics endpoint in grievances.py, following a consistent optimization approach across routers.

Suggested labels

size/m

Poem

🐰 One query hops where many trudged before,
Metrics bundled up, so sleek and spry—
The database smiles at fewer round trips soar,
Efficiency wins as the rabbits fly! 🚀

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: combining count queries in get_visit_statistics for performance optimization, which aligns with the changeset.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Description check	✅ Passed	The pull request description is well-structured with clear sections explaining what changed, why it was changed, the impact, and how to verify it. It includes context about the task and follows a logical flow.

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✨ Finishing Touches

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bolt-optimize-visit-stats-2447378373000461510

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[cubic-dev-ai]

No issues found across 1 file

[Copilot]

Pull request overview

Refactors the get_visit_statistics endpoint in the field officer router to compute visit metrics using a single SQL aggregate query, reducing database round-trips and improving endpoint performance under load.

Changes:

• Consolidated multiple count()/avg() queries into one aggregated query using SUM(CASE ...), COUNT(DISTINCT ...), and AVG(...).
• Preserved existing output shaping (defaults for counts and rounding for average distance).

Comments suppressed due to low confidence (1)

backend/routers/field_officer.py:413

• The comment about an “N+1 count query bottleneck documented in Bolt's journal” is misleading here (this was a fixed number of aggregate queries, not an N+1 pattern) and the “Bolt's journal” reference is unclear for future maintainers. Consider rewriting these lines to describe the optimization concretely (e.g., combining multiple aggregates into one query) without tool-/persona-specific references.

        # Performance Boost: Consolidate multiple aggregate queries into a single database round trip
        # This resolves the N+1 count query bottleneck documented in Bolt's journal
        stats = db.query(

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