Add automated rollback to last-known-healthy version

[gelluisaac]

Title

Add automated rollback to last-known-healthy version

Context

AstroML is a research-driven Python framework for building dynamic graph machine learning models on the Stellar blockchain (ingestion -> graph -> train). This issue is a contributor-friendly task intended to be picked up by the community. Please ask for clarification in the discussion thread before starting, and reference this issue in your PR.

Task

Add a config-driven guard that rolls serving back to the previous healthy version when health checks fail immediately after activation.

Suggested files / areas

astroml/models, astroml/serving

Acceptance Criteria

• Versioning, lineage and activation are preserved
• Migration or rollback path is defined
• Covered by tests

Difficulty: Hard

This issue is ideal for a first-time contributor. If you would like to work on it, comment to claim it and maintainers will assign it to you.

[abikedaniel22]

@abikedaniel22 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello maintainer I'll like to work on this issue please can you assign me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @abikedaniel22 to this issue.

[69starman]

@69starman has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello sir maintainer....
I have a vast experience in solving github issues ...
Please do well to assign me this let me get it done for you ✅.
Thank you 😊

ℹ️ Repo Maintainers: To accept this application, review their application or assign @69starman to this issue.