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Switching KC Star from always-rebuild to selective recalculation means dropping V7's triggers and installing V8's without losing data. Unlike V7's chaotic refactor, this migration ships a real verification function - and one landmine where dimension ids mean different things.
Splitting a name field, converting a string to a bool, deriving a flag from a total - some migrations are code, not metadata. This part covers VersionKit's three escape hatches and the sharp edges each one carries. Part 5 of the Entity Versioning with VersionKit series.
Every stored payload carries a __version stamp; every read walks it up one step at a time. This part dissects VersionKit's lazy migration pipeline - the MigrationRunner API, the JsonElement traps System.Text.Json sets for dictionary code, and reading history on purpose. Part 4 of the Entity Versioning with VersionKit series.
