This is a case-study blueprint; no deployment results or customer endorsement are claimed.
Business challenge
A data platform transition must preserve historical reporting grain and slowly changing records.
Migration approach
Move approved partitions and historical versions using fixed mappings and comparison windows. Identify suspicious gaps, inconsistent dimensions, or unclear historical status meanings.
Deterministic work
Move approved partitions and historical versions using fixed mappings and comparison windows. Record rule versions, target constraints, and unresolved exceptions; verify outputs against an agreed baseline.
Agentic assistance
Identify suspicious gaps, inconsistent dimensions, or unclear historical status meanings. Review generated proposals before adopting them as implementation or access rules.
Acceptance evidence
Compare effective-date joins, period totals, late records, and retained history with domain owners.
Delivery time
The 40 months (estimated) assumes the stated migration inventory, accessible source definitions, available reviewers, and an agreed target environment. Plan discovery, design, build, parity testing, business review, and release readiness as separate checkpoints. Re-estimate when access, custom features, data issues, or acceptance scope changes.