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server/prisma/schema.prisma

@@ -30,6 +30,7 @@ model User {
   approvedSalesOrders SalesOrder[] @relation("SalesOrderApprovedBy")
   salesQuoteRevisionsCreated SalesQuoteRevision[] @relation("SalesQuoteRevisionCreatedBy")
   salesOrderRevisionsCreated SalesOrderRevision[] @relation("SalesOrderRevisionCreatedBy")
+  purchaseOrderRevisionsCreated PurchaseOrderRevision[]
   inventoryTransfersCreated InventoryTransfer[] @relation("InventoryTransferCreatedBy")
   auditEvents AuditEvent[]
 }
@@ -681,6 +682,7 @@ model PurchaseOrder {
   vendor         Vendor   @relation(fields: [vendorId], references: [id], onDelete: Restrict)
   lines          PurchaseOrderLine[]
   receipts       PurchaseReceipt[]
+  revisions      PurchaseOrderRevision[]
 }
 
 model PurchaseOrderLine {
@@ -743,6 +745,22 @@ model PurchaseReceiptLine {
   @@index([purchaseOrderLineId])
 }
 
+model PurchaseOrderRevision {
+  id             String   @id @default(cuid())
+  purchaseOrderId String
+  revisionNumber Int
+  reason         String
+  snapshot       String
+  createdById    String?
+  createdAt      DateTime @default(now())
+  updatedAt      DateTime @updatedAt
+  purchaseOrder  PurchaseOrder @relation(fields: [purchaseOrderId], references: [id], onDelete: Cascade)
+  createdBy      User? @relation(fields: [createdById], references: [id], onDelete: SetNull)
+
+  @@unique([purchaseOrderId, revisionNumber])
+  @@index([purchaseOrderId, createdAt])
+}
+
 model AuditEvent {
   id           String   @id @default(cuid())
   actorId      String?