rc-migration-tests/vb-migration/migration-prerequisites.md

Enhanced Migration Prerequisites and Best Practices

Critical Prerequisites Before Migration

1. Test Coverage Requirements

• Implement comprehensive unit tests with minimum 80% code coverage
• Create integration tests for all critical business workflows
• Establish end-to-end tests for main user journeys
• Document all test scenarios and expected outcomes
• Set up automated test runs in CI/CD pipeline
• Create performance benchmarks for critical operations
• Implement API contract tests if applicable
• Set up regression test suites

2. Code Quality Baseline

• Run static code analysis tools and fix all critical/high issues
• Document and justify any suppressions of warnings
• Remove all deprecated API usage
• Clean up unused references and dependencies
• Ensure consistent code formatting
• Remove dead code and unused variables
• Document all known technical debt
• Fix all compiler warnings

3. Documentation Requirements

• Create detailed API documentation
• Document all business rules and domain logic
• Map out all external system integrations
• Document configuration settings and their purposes
• Create system architecture diagrams
• Document all custom implementations and workarounds
• Maintain a glossary of business terms
• Document all scheduled tasks and batch processes

4. Infrastructure and Environment

• Set up separate environments for migration testing
• Create rollback procedures
• Implement monitoring and logging
• Set up feature flags for gradual migration
• Create backup and restore procedures
• Document deployment procedures
• Set up parallel run capabilities
• Establish performance monitoring baselines

5. Business Validation

• Identify subject matter experts for each module
• Create business validation test cases
• Document critical business periods to avoid
• Create business continuity plan during migration
• Establish acceptance criteria for migration success
• Document regulatory compliance requirements
• Create data validation procedures
• Establish UAT test plans

Enhanced Best Practices

1. Code Organization

• Implement clean architecture principles
• Separate business logic from infrastructure code
• Use dependency injection consistently
• Implement repository pattern for data access
• Use SOLID principles
• Implement proper exception handling
• Use consistent logging patterns
• Implement proper configuration management

2. Testing Strategy

• Create smoke test suite for quick validation
• Implement automated UI tests for critical paths
• Create load and stress tests
• Implement security testing procedures
• Create data-driven tests for complex scenarios
• Implement boundary testing
• Create mutation tests for critical components
• Establish performance testing benchmarks

3. Version Control

• Create feature branches for migration
• Implement proper PR review process
• Set up branch protection rules
• Create meaningful commit messages
• Document branching strategy
• Implement version tagging
• Create release notes template
• Set up automated builds for all branches

4. Migration Process

• Start with smallest, least dependent modules
• Create detailed checklist for each module
• Implement feature toggles for gradual rollout
• Create validation scripts for each phase
• Document all migration decisions
• Create progress tracking system
• Establish regular checkpoints
• Create contingency plans

5. Post-Migration Validation

• Create comparison tools for old vs new system
• Implement parallel run procedures
• Create data reconciliation processes
• Document performance comparison metrics
• Establish monitoring for regression issues
• Create user feedback collection process
• Implement automated health checks
• Create system stability metrics

6. Security Considerations

• Perform security audit before migration
• Document all security requirements
• Implement security testing procedures
• Create security validation checklist
• Document authentication/authorization changes
• Implement secure configuration management
• Create security incident response plan
• Perform penetration testing

7. Performance Requirements

• Establish performance benchmarks
• Create performance test suites
• Document scalability requirements
• Implement performance monitoring
• Create capacity planning documentation
• Establish SLA requirements
• Create performance optimization plan
• Document resource utilization metrics

8. Documentation Standards

• Use consistent documentation format
• Create documentation review process
• Implement version control for documentation
• Create API documentation standards
• Establish documentation update procedures
• Create user guides and training materials
• Document troubleshooting procedures
• Maintain decision log

Risk Mitigation Strategies

1. Technical Risks

• Create technical risk register
• Implement mitigation strategies for each risk
• Create fallback procedures
• Document known limitations
• Create technical debt register
• Establish bug triage process
• Create incident response procedures
• Document system dependencies

2. Business Risks

• Document business impact analysis
• Create business continuity procedures
• Establish communication plans
• Create stakeholder management plan
• Document compliance requirements
• Create data governance procedures
• Establish change management process
• Create training plans

3. Operational Risks

• Create operational procedures
• Document support processes
• Establish escalation procedures
• Create monitoring procedures
• Document backup procedures
• Create disaster recovery plans
• Establish SLA monitoring
• Create capacity management plans