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server/prisma/migrations/20260315221500_purchase_order_revisions/migration.sql

@@ -0,0 +1,19 @@
+-- CreateTable
+CREATE TABLE "PurchaseOrderRevision" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "purchaseOrderId" TEXT NOT NULL,
+    "revisionNumber" INTEGER NOT NULL,
+    "reason" TEXT NOT NULL,
+    "snapshot" TEXT NOT NULL,
+    "createdById" TEXT,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    CONSTRAINT "PurchaseOrderRevision_purchaseOrderId_fkey" FOREIGN KEY ("purchaseOrderId") REFERENCES "PurchaseOrder" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "PurchaseOrderRevision_createdById_fkey" FOREIGN KEY ("createdById") REFERENCES "User" ("id") ON DELETE SET NULL ON UPDATE CASCADE
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "PurchaseOrderRevision_purchaseOrderId_revisionNumber_key" ON "PurchaseOrderRevision"("purchaseOrderId", "revisionNumber");
+
+-- CreateIndex
+CREATE INDEX "PurchaseOrderRevision_purchaseOrderId_createdAt_idx" ON "PurchaseOrderRevision"("purchaseOrderId", "createdAt");

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?