[SagiEv]

Description

Resolves an issue where rapid or repeated submit clicks when creating a new job application resulted in multiple duplicate records with distinct IDs in the database.

This fix addresses both the frontend UI interaction layer and backend execution boundaries by implementing synchronous button locking, in-flight request coalescing, and database duplicate detection with idempotent 200 OK responses.

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Changes

🎨 Tier 1: Frontend (React)

• Button Lock & State (ApplicationsPage.jsx):
  • Bound submit button text to {isAdding ? 'Adding...' : 'Save Application'} and marked disabled={isAdding || !newAppForm.COMPANY || !newAppForm.ROLE_ID}.
  • Disabled the modal cancel button, backdrop dismissal, and close button while submission is in-flight.
  • Added an early return guard in onSubmit (if (isAdding) return;).
  • Reset STAGE: '' alongside all form fields upon successful creation.
• Synchronous Click Guard (useApplications.js):
  • Added an isAddingRef = useRef(false) lock inside addApplication to intercept rapid synchronous clicks within the same event loop tick before React re-renders.
  • Exposed isAdding: addApplicationMutation.isPending.

⚙️ Tier 2: Primary Backend (Node.js / Express)

• In-Flight Request Coalescing (applications.controller.js):
  • Maintained an in-flight cache keyed by normalized ${userId}:${company}:${roleId}:${date}.
  • Concurrent incoming requests coalesce onto the single active promise, avoiding redundant synchronous fit-context calculations and duplicate asynchronous background AI jobs.
• Service Deduplication (applications.service.js):
  • Implemented in-flight coalescing (inFlightCreations) and normalized application dates to the calendar day (YYYY-MM-DD, ignoring hours/time components).
  • Queried repository duplicate lookup before inserting. If a matching record already exists for the user on that date, returns the existing application idempotently with 200 OK (tagged _wasDeduplicated: true) without creating orphan history entries.

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Project	Deployment	Actions	Updated
job-pilot	Ready	Preview	Nov 5, 2026 11:05pm UTC