At Most Once, and Sometimes Not at All
What an in-process event dispatcher actually guarantees when there is no outbox, no dead letter, no correlation id and no drain on shutdown - and the one static field the whole thing depends on.
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Paying Down the Migration Debt
Lazy migration makes deploys instant but taxes every read of old data. VersionKit's backfill service rewrites stale payloads in scheduled batches until the store converges on the current version - in a host, or from a serverless function. Part 6 of the Entity Versioning with VersionKit series.