[StuartFerguson]

Summary

• Add SQLite-backed coverage for merchant, operator, and product grouping over the keyless TodayTransaction projection.
• Verify grouped names, sales totals, multiple groups, and empty results while keeping production mapping unchanged.

Closes #607

Verification

• Business logic tests: 120 passed.
• API tests: 12 passed.
• Release build succeeded.
• git diff --check passed.
• Coverage report generation was attempted, but the runner could not connect to its named pipe in this environment.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-29T19:50:21.401245Z	3414338	PR opened

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

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