Pillar

Migrations and Tradeoffs

How to move systems safely while cost, correctness, and timing all fight each other.

Migration plans reveal whether architecture thinking is operationally honest.

Why this pillar matters

The real cost of a design often appears only when the team has to change it without downtime.

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23 min read

The migration pattern that looks straightforward until correctness becomes temporal.

Dual writes are migration tools, not correctness guarantees, and teams need a clear plan for comparison, rollback, and reconciliation.

Related pillars

Failure and Resilience

Designing around degraded dependencies, retries, and compounded failure.

How capacity, cost, failure tolerance, and risk tolerance shape practical architecture choices.