lib.rs does not implement a circuit breaker for repeated payment failures — failing courses stay active

[SYLVIANNORUKA]

Description

If enroll() fails repeatedly for a specific course in contracts/hamplard/src/lib.rs (e.g., due to a broken token contract), there is no circuit breaker that automatically pauses the course after N consecutive failures. The course remains in Active status indefinitely, causing ongoing failed transactions.

Affected modules: contracts/hamplard/src/lib.rs

No circuit breaker allows persistently-failing courses to remain active, wasting student transaction fees.

Expected Behavior

Track consecutive enrollment failure counts per course. After a configurable threshold is exceeded, automatically transition the course to Paused and emit an alert event.

Tasks

• Add per-course failure counter to contract storage.
• Increment counter on enrollment failure and check against threshold.
• Auto-pause course when threshold is exceeded and emit alert event.
• Add tests for circuit breaker activation and reset.

[DDefiBoy]

Good morning, Chief Maintainer,

I am an experienced software developer with a background in open-source contributions. I would like to work on this issue and contribute a clean, well-structured, and maintainable solution.

If possible, I would appreciate the opportunity to take it on. I’m ready to follow any contribution guidelines and provide timely updates.

Thank you for your consideration.

[OAKVISUALZ]

Please assign me this issue.