rollback ci script

[OmniZlatoon]

Database Migration Rollback Checker Implementation

This walkthrough outlines the changes made to introduce an automated CI testing script that verifies the safe rollback of database migrations in the Web3 Student Lab project.

Overview of Changes
To ensure database schema integrity post-rollback, the CI pipeline is now configured to test if the latest database migration can execute a clean rollback loop without data corruption or dangling schema artifacts.

1. Rollback Test Script (backend/scripts/test-migration-rollback.sh)
Since Prisma does not natively generate or store down.sql scripts, we introduced a bash script to dynamically simulate the rollback process:

It creates a temporary directory simulating the previous migration state (N-1).
It migrates the test database to the latest state (N).
It uses npx prisma migrate diff to compare the N state with the N-1 state and generates a dynamic down.sql script to undo the latest changes.
It executes the down.sql via npx prisma db execute.
It performs a final verification check using npx prisma migrate diff --exit-code to ensure the current database schema accurately matches the schema of the N-1 state.
2. NPM Script (backend/package.json)
A new script "test:migrations" was added to execute the bash script:

json
"test:migrations": "bash scripts/test-migration-rollback.sh"

3. CI Pipeline Integration (.github/workflows/ci.yml)
The GitHub Actions workflow for the backend was updated to invoke this script. The Test Migration Rollbacks step is strategically placed after the initial Prisma Generate & Migrate step.

closes #742

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[OmniZlatoon]

Hello maintainer, I have completed the task. Please review

[OmniZlatoon]

good morning maintainer, I have completed the task. please review PR