diff --git a/prisma/migrations/20260804103916_assignment_fk_restrict/migration.sql b/prisma/migrations/20260804103916_assignment_fk_restrict/migration.sql
new file mode 100644
index 0000000..2ef27a3
--- /dev/null
+++ b/prisma/migrations/20260804103916_assignment_fk_restrict/migration.sql
@@ -0,0 +1,11 @@
+-- DropForeignKey
+ALTER TABLE "assignments" DROP CONSTRAINT "assignments_asset_item_id_fkey";
+
+-- DropForeignKey
+ALTER TABLE "assignments" DROP CONSTRAINT "assignments_license_id_fkey";
+
+-- AddForeignKey
+ALTER TABLE "assignments" ADD CONSTRAINT "assignments_asset_item_id_fkey" FOREIGN KEY ("asset_item_id") REFERENCES "asset_items"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "assignments" ADD CONSTRAINT "assignments_license_id_fkey" FOREIGN KEY ("license_id") REFERENCES "licenses"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index d5b63b5..94aa239 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -398,9 +398,9 @@ model Assignment {
   employeeId  String     @map("employee_id") @db.Uuid
   employee    Employee   @relation(fields: [employeeId], references: [id])
   assetItemId String?    @map("asset_item_id") @db.Uuid
-  assetItem   AssetItem? @relation(fields: [assetItemId], references: [id])
+  assetItem   AssetItem? @relation(fields: [assetItemId], references: [id], onDelete: Restrict)
   licenseId   String?    @map("license_id") @db.Uuid
-  license     License?   @relation(fields: [licenseId], references: [id])
+  license     License?   @relation(fields: [licenseId], references: [id], onDelete: Restrict)
   assignedAt  DateTime   @default(now()) @map("assigned_at") @db.Timestamptz(6)
   returnedAt  DateTime?  @map("returned_at") @db.Timestamptz(6)
   signedAt    DateTime?  @map("signed_at") @db.Timestamptz(6)