Databases & Data Systems

Database representations, schema changes, transactions, change propagation, recovery and data-system correctness.

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Online schema migration shows a stale backfill race, version-conditioned writes, ordered mutation replay, partial dual-write failure, validated authority cutover and rollback after a lossy lowercase transform.

How online schema migration orders backfill, live writes and authority changes

Reject stale backfills, reconcile partial dual writes, guard authority cutover with capture evidence, and test rollback after irreversible transformations.