Plan and execute safe cross-system migrations — schema, data, API, infrastructure, and service — with compatibility windows, dual-running, backfills, reconciliation, cutover, deprecation, and cleanup. Covers expand/contract, reversible and irreversible recovery paths, migration observability, correc
Plan and execute safe cross-system migrations — schema, data, API, infrastructure, and service — with compatibility windows, dual-running, backfills, reconciliation, cutover, deprecation, and cleanup. Covers expand/contract, reversible and irreversible recovery paths, migration observability, correctness evidence, ownership, and customer impact. Do not use for single-technology quick fixes, tool-s