Start with a dependency map
Identify which sources feed datasets, which reports consume them and who uses them for decisions. This exposes critical chains and hidden manual work.
Business risk, not technical debt alone, should set migration priority.
Migrate vertical slices
Move one domain from source to new report, then compare it with the legacy system for an agreed period.
- Parallel calculation
- Automated reconciliation
- Acceptance owner
- Rollback plan
Build the foundation for AI
A modern platform should provide history, quality, cataloguing and governed access. These capabilities make data reusable for analytics and AI.
Modernisation ends with user and accountability migration, not table movement.