Bugfix/job application email identifier bugs

[SagiEv]

Fix Application Status Lifecycle and History Audit Trail

Overview

This PR standardizes system statuses, fixes background polling bugs that incorrectly matched emails to terminal applications, and bulletproofs the application history audit trail. Previously, automated email polling was silently updating application statuses directly in the database without logging history, leading to desynchronized activity logs and incorrect "Last Updated" dates.

Changes Made

1. Status Standardization

• Removed all usages of the deprecated follow_up status. It is now functionally treated as Applied.
• Enforced strict Title Case for system statuses across the backend (Applied, Screening, Assessment, Interviewing, Offer, Rejected) to match the exact strings expected by the UI.

2. Bulletproofed History Logging

• Mail Poller Refactor: Modified mail-poller.service.js to call applicationsService.updateApplication instead of performing direct database updates (applicationRepo.update). This ensures that status changes triggered by incoming emails properly insert new application_history events.
• Application Creation Logic: Updated applications.service.js to explicitly register Application Added events via applicationHistoryService.logChange when applications are created (single or bulk imports).

3. Fixed Email Matching for Terminal Applications

• Filtered Terminal Applications: Modified mail-poller.service.js to filter out terminal applications (Rejected, Offer, Hired, Withdrawn, Ignored) before classifying emails. This resolves a bug where a new rejection email would incorrectly match an older, already-rejected application for the same company, overwriting its event_date.

4. Database Migrations & Resync Scripts

• Created and ran fix_follow_up_status.js to migrate existing follow_up statuses to Applied in the DB.
• Created and ran sync_applications_history.js to fix corrupted database state by fetching the latest application_history event for each application and resyncing the status, stage, and date fields in the applications table.

5. Testing Infrastructure Updates

• Updated integration tests (email-pipeline.integration.test.js, application-lifecycle.integration.test.js) and unit tests to adhere strictly to the Title Case constraint.
• Upgraded the Supabase sandbox in setup.integration.js to support chained, sequential .select().single() mock responses to handle complex repository queries during testing.

Verification

• ✅ Unit tests passed (npm test locally).
• ✅ Integration tests verified that automated email state transitions succeed and populate the application_history table correctly.
• ✅ Data resync script executed successfully (corrected 67 out-of-sync applications).

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Project	Deployment	Actions	Updated
job-pilot	Ready	Preview	Sep 19, 2026 6:06pm UTC