Add nulls.ValidInt64Count helper

[soumajitgh]

Summary

• Add nulls.ValidInt64Count, a small helper that counts how many sql.NullInt64 values in a variadic list are valid.

Context

Extracted from #1343 ("Add frequency-based schedule-for-stop service"). That PR's schedule_for_stop_handler.go changes collide with the in-flight #1348 ("GTFS Frequencies Phase 3"), which is taking over that file. This helper has no dependency on the rest of #1343's changes and is general-purpose (counting valid frequency-row fields to decide whether a row is usable), so it's being carved out on its own rather than getting lost when #1343 closes.

Validation

• go vet -tags "sqlite_fts5 sqlite_math_functions" ./...
• go vet -tags "purego" ./...
• make test
• go fmt ./...

Summary by CodeRabbit

• New Features

  • Added support for counting valid numeric values while ignoring null entries.

• Tests

  • Added coverage to verify accurate counting when valid and null values are mixed.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 0f56091d-fd0a-438e-9bed-9c0d8c70f458

📥 Commits

Reviewing files that changed from the base of the PR and between 710c211 and c64ad7b.

📒 Files selected for processing (2)

• internal/nulls/database.go
• internal/nulls/database_test.go

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The nulls package adds ValidInt64Count to count valid sql.NullInt64 values. A test verifies the count for two valid values and one invalid value.

Changes

Nullable integer count

Layer / File(s)	Summary
Valid integer count helper and validation internal/nulls/database.go, internal/nulls/database_test.go	ValidInt64Count counts values with Valid set to true. TestValidInt64Count verifies the result for two valid values and one invalid value.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: ⚪ Minimal · up to c64ad

This localized helper adds valid-value counting behavior with no actionable merge-blocking risk remaining after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding the nulls.ValidInt64Count helper.
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.

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