Data Migration Reconciliation and Cutover
Row counts matched on both sides at cutover. Month-end totals disagreed by eleven thousand. The count had been the only check anyone wrote down.
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Parallel Run
In a fictional telecom, a parallel run compared month-end figures from both systems and exposed a rounding rule the legacy report had applied for nine years.
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Migration Fallback
In a fictional telecom, a standalone backup lacked six days of changes. Returning required a tested procedure to recover state, transfer write authority, and reconnect clients.
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Case: Data Platform Migration for AI Consumers
A fictional distributor replaces its warehouse while a search index and a prediction model depend on the old outputs. Contracts, dual running, reconciliation, and a coded cutover rule decide when each consumer moves.
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Cutover
Plan a cutover with a rehearsal, a timed runbook naming owners and evidence, go/no-go criteria agreed in advance, a stop rule, and a decision owner.