Implement Audit Log System

[llinsss]

Description:
Create comprehensive audit log for all sensitive operations.

Tasks:

• Create audit log model
• Log all CRUD operations
• Include user, IP, timestamp
• Add audit log query endpoints
• Implement log retention policy

Files to create:

• backend/models/AuditLog.js
• backend/middleware/audit.js

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[NueloSE]

@NueloSE has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I can help resolve this issue kindly assign me.

I have handled a similar issue as this in the previous wave

ETA <= 10hrs

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Congratulations, @NueloSE! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @NueloSE: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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This issue has been completed by @NueloSE as part of the Stellar Wave Program's 2nd Wave 🥳

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