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#postgresql4
I tested restoration, application behavior, and worker isolation with production data before migrating NCP accounts. The rehearsal exposed extension schema, connection target, and leftover Redis key issues, while the actual cutover verified matching data and about 13 minutes of user impact.
I compared three ways to migrate PostgreSQL and Redis between NCP accounts. Data size and operating conditions favored a short pause in writes and dump-and-restore, with the resumption of writes defining the cutover boundary.
42.8% errors in 9 minutes, caused by one updateMany
A 7-node production clone, rebuilt with one make command
