Was implicitly SET NULL (Prisma default for nullable FK columns),
inconsistent with employeeId's RESTRICT. Once a delete endpoint for
AssetItem/License exists, SET NULL would silently null out historical
Assignment rows on delete, erasing what was assigned and re-violating
the assetItemId/licenseId XOR retroactively. No delete endpoint exists
yet, so no real data was ever affected by the old behavior.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
