Fixing/Clearing up migration process and workflow

[DJJones66]

🔧 Fix Alembic Migration Chain & Improve Migration Tooling

Summary

This PR addresses a foundational issue in the main branch’s Alembic migration chain that caused inconsistencies and risked migration conflicts. It introduces a comprehensive fix to ensure forward and backward compatibility across all existing and future migrations, while also adding robust tooling and CI support for validation.

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✅ Key Fixes

• Migration Safety Improvements:

  • Wrapped all upgrade() and downgrade() logic with conditional checks for table/column/index existence.
  • Prevents duplicate creation or deletion that would break migration cycles.
  • Ensures idempotent behavior of all migrations moving forward.

• Fixed Broken Migration Chain:

  • Adjusted previously problematic migration files with missing down_revision tracking or unsafe schema alterations.

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🛠️ Added Tooling

• Makefile & Windows Batch File (migrate.bat)
  Unified CLI for managing migrations across platforms with aliases for:

  • validate-migrations, test-migrations, fix-migration-conflict, monitor-health, etc.

• Pre-Commit Hooks (.pre-commit-config.yaml)

  • Ensures migrations are syntactically valid and follow naming conventions.
  • Includes Black and Flake8 for code quality.

• Migration Monitoring Tools

  • scripts/migration_monitor.py: Health checks with alerting support.
  • scripts/migration_recovery.py: Diagnostic and emergency restoration capabilities.
  • scripts/advanced_migration_tests.py: Performance + integrity test suite.
  • scripts/test_migrations.py: Tests migration up/down safety.
  • scripts/validate_migrations.py: Detects conflicts and validates dependency graphs.

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🧪 Test Coverage

• Validated with:

  • make test-migrations
  • make validate-migrations
  • make advanced-tests

• All migration paths successfully tested:

  • Upgrade → Downgrade → Upgrade cycle
  • Individual revision-level up/down tests
  • Health status reports HEALTHY

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📊 Migration Health Snapshot

Overall Status: HEALTHY
- No pending migrations
- Alembic version table validated
- Schema and revision history integrity confirmed
- 0 critical issues, 0 warnings

See migration_health_history.json for full historical snapshots.

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🧩 Files Added or Modified

• backend/migrations/versions/* – all upgraded with safe conditional logic
• backend/scripts/* – new tooling and diagnostics
• .pre-commit-config.yaml, Makefile, migrate.bat – CLI + hooks
• migration_health_history.json – historical snapshots
• backend/migration_health_history.json – latest health output

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🧠 Why It Matters

This PR sets the foundation for long-term maintainability of our DB migration layer. It prevents accidental destructive migrations and provides full observability and tooling for developers to maintain DB schema health.