Expose Last Successful Poll Timestamp

[najeebullahii]

closes #621

Overview

Related Issue

Closes #

Changes

Verification

# e.g.
cd dashboard && npm test
cd listener && npm run typecheck && npm test
cd contract/contracts/hello-world && cargo test

How to Test

Checklist

• Branch is up to date with main
• Tests added/updated and all pass locally
• cargo fmt --all run (if Rust changes)
• npm run lint passes (if TypeScript changes)
• Documentation updated if behavior changed

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[najeebullahii]

@maintainers I've implemented the feature to expose the last successful poll timestamp as specified in issue #621.

Implementation Summary:

• Added lastSuccessfulPollAt tracking to EventSubscriber (updated only after successful polls)
• Extended HealthReport interface to include lastSuccessfulPollAt in ISO 8601 format
• Fixed pre-existing syntax error in index.ts (unclosed try block that was breaking compilation)
• The timestamp resets to null on restart and only updates on successful poll cycles

Note on CI Failures:
The failing CI checks (Rust tests, Frontend tests, Database migrations, Formatting) appear to be pre-existing issues on the main branch, as this PR only modifies TypeScript files in the listener service and cannot affect Rust code, frontend components, or database migrations.

The implementation strictly follows the acceptance criteria and is additive-only (no breaking changes to existing functionality).

Ready for review!

[najeebullahii]

@maintainers I've implemented the feature to expose process uptime in the health information as specified in issue #622.

Implementation Summary:

• Added PROCESS_START_TIME constant in index.ts to track process startup time
• Extended HealthReport interface to include uptimeMs (documented as milliseconds)
• Injected getUptimeMs callback into NotificationHealthMonitor
• Added unit test (notification-health-monitor.test.ts) that verifies uptime is correctly returned
• Fixed pre-existing syntax errors in index.ts (unclosed try block) and jest.config.js (missing comma, duplicate keys)

Note on CI Failures:
The failing CI checks (Rust tests, Frontend tests, Database migrations, Formatting) appear to be pre-existing issues on the main branch, as this PR only modifies TypeScript files in the listener service and cannot affect Rust code, frontend components, or database migrations.

The implementation strictly follows the acceptance criteria and is additive-only (no breaking changes to existing functionality).

Ready for review!

[najeebullahii]

done