feat: session expiry feature implemented

[anandshukla15]

Description

session expiry implemention with jwt

Semver Changes

-code of session expiry of period 7 days and logout functionality

Checklist

I have read the Contributing Guidelines.

[04shubham7]

@anandshukla15 pls resolve merge conflicts carefully at first

[anandshukla15]

@04shubham7 done

[Copilot]

Pull Request Overview

This PR implements JWT-based session management with a 7-day expiration period and logout functionality. The implementation introduces database-backed session tracking using MongoDB and automated cleanup of expired sessions.

Key changes:

• Session persistence layer added via a new sessionModel to track active user sessions
• Logout endpoint implemented to invalidate sessions by removing them from the database
• Automated cron job scheduled to clean up expired sessions daily at 2 AM

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
backend/src/models/sessionModel.ts	Defines the Session schema with TTL index for automatic MongoDB expiration
backend/src/controllers/authController.ts	Creates session records during registration and login
backend/src/middleware/authMiddleware.ts	Validates tokens against active sessions in the database
backend/src/routes/authRoutes.ts	Adds logout endpoint to delete session records
backend/src/server.ts	Schedules daily cron job to clean up expired sessions
backend/src/utils/generateToken.ts	Refactored to use clearer variable naming (userId instead of id)
backend/package.json	Adds node-cron dependency for scheduled tasks
backend/tsconfig.tsbuildinfo	Updated build manifest to include sessionModel

Files not reviewed (1)

• backend/package-lock.json: Language not supported

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[04shubham7]

good work

[04shubham7]

@anandshukla15 pls resolve merge conflicts