Nullable FK from License to PurchaseOrder for supply-side traceability
(which PO a license came in through), mirroring AssetItem.purchaseOrderId's
just-merged pattern exactly. Separate commit from the earlier
License.vendorId retrofit per the project's 1-commit-per-business-change
convention.
License.vendor (free-text string) is now vendorId, a required FK to
Vendor, per docs/asset-license-management.md's "## Vendor (chốt
2026-08-02)" spec. Mirrors the Request.employeeId string->FK precedent:
Zod validates UUID format only, Prisma's own FK constraint (P2003) is
caught at insert time and translated into a clean 400 instead of a raw
500. No License data existed yet, so this is a pure column-type
migration, no backfill needed.
Also converts createLicense() to the {ok,value}|{ok,error} result
pattern used elsewhere (createRequest, createAssetItem) instead of
returning a bare LicenseRecord promise - closes the gap flagged in
CLAUDE.md now that License has its first FK-violation error case to
handle.
- createRequestSchema now requires employee_id to be a UUID-format
string (was a free-text non-empty check), matching the new FK to
Employee in schema.prisma.
- createRequest() now returns a CreateRequestResult discriminated
union and catches Prisma P2003 (FK violation), returning a friendly
ok:false error instead of a raw 500 when employee_id does not
reference an existing Employee. POST /api/requests branches on
created.ok and returns 400 in that case.
- tests/requests.test.ts: every test that used to POST a fake string
employee_id (emp-1, emp-2) now creates a real Employee first via
createTestEmployee() and uses its id, since employee_id is now a
real FK. Added coverage for a syntactically invalid UUID and for a
well-formed but non-existent UUID (expects the friendly 400 from
the P2003 catch, not a raw 500) - the exact case this retrofit was
meant to protect against.
Mirrors src/lib/requests.ts's shape: Zod schema, ValidationResult
discriminated union, CRUD via Prisma, toRecord() camelCase->snake_case
mapping. managerId is only format-checked as a UUID here; a
nonexistent managerId is caught via Prisma's P2003 FK-violation error
in createEmployee() and translated into a friendly {ok:false,error}
instead of leaking a raw Prisma error.