# FLR003-LAB1 — Schema Drift

Use only the supplied deterministic synthetic fixtures. For each case, build **Schema Drift Failure Record v1**.

Keep writer schema, reader schema, and environment projection separate. A migration artifact or schema-only snapshot is evidence, not proof that every environment is compatible. Do not classify every difference as breaking; reproduce impact on the observed reader/writer path. Preserve `UNKNOWN` when evidence is incomplete.

The transfer case changes from row-shaped data to event payload plus database projection. Rebuild the affected boundary from event, mapper, and projection evidence instead of copying the row-based answer.