feat(db): reshape user and inventory schema

prisma/migrations/20260603100143_init/migration.sql

@@ -1,66 +1,111 @@
 -- CreateEnum
 CREATE TYPE "UserRole" AS ENUM ('ADMIN', 'MANAGER', 'STAFF', 'VIEWER');
 
+-- CreateEnum
+CREATE TYPE "UserStatus" AS ENUM ('INVITED', 'ACTIVE', 'SUSPENDED', 'DISABLED');
+
 -- CreateEnum
 CREATE TYPE "PersonDepartment" AS ENUM ('IT', 'ENGINEERING', 'LOGISTICS', 'TRAFFIC', 'DRIVER', 'ADMINISTRATION', 'SALES', 'OTHER');
 
 -- CreateEnum
-CREATE TYPE "ItemStatus" AS ENUM ('AVAILABLE', 'ASSIGNED', 'RESERVED', 'IN_REPAIR', 'BROKEN', 'STOLEN', 'DISPOSED');
+CREATE TYPE "ItemTrackingType" AS ENUM ('QUANTITY', 'SERIALIZED');
 
 -- CreateEnum
-CREATE TYPE "MovementType" AS ENUM ('IN', 'OUT', 'ASSIGNMENT', 'RETURN', 'ADJUSTMENT', 'DELETED');
+CREATE TYPE "ItemStatus" AS ENUM ('ACTIVE', 'DISCONTINUED', 'ARCHIVED');
+
+-- CreateEnum
+CREATE TYPE "AssetStatus" AS ENUM ('AVAILABLE', 'ASSIGNED', 'IN_REPAIR', 'BROKEN', 'LOST', 'STOLEN', 'DISPOSED', 'RETIRED');
+
+-- CreateEnum
+CREATE TYPE "AssignmentStatus" AS ENUM ('OPEN', 'PARTIALLY_RETURNED', 'RETURNED', 'CANCELLED');
+
+-- CreateEnum
+CREATE TYPE "InventoryMovementType" AS ENUM ('RECEIPT', 'ISSUE', 'ASSIGNMENT', 'RETURN', 'ADJUSTMENT', 'STATUS_CHANGE', 'DISPOSAL', 'INITIAL_LOAD');
+
+-- CreateEnum
+CREATE TYPE "InventoryMovementReason" AS ENUM ('PURCHASE', 'MANUAL_ENTRY', 'EMPLOYEE_ASSIGNMENT', 'EMPLOYEE_RETURN', 'INVENTORY_CORRECTION', 'DAMAGE', 'REPAIR', 'REPAIR_RETURN', 'LOSS', 'THEFT', 'DISPOSAL', 'INITIAL_LOAD', 'OTHER');
+
+-- CreateEnum
+CREATE TYPE "StockAlertStatus" AS ENUM ('OPEN', 'ACKNOWLEDGED', 'RESOLVED');
+
+-- CreateEnum
+CREATE TYPE "StockAlertTrigger" AS ENUM ('BELOW_MINIMUM', 'OUT_OF_STOCK');
 
 -- CreateTable
 CREATE TABLE "User" (
-    "id" TEXT NOT NULL,
+    "id" UUID NOT NULL,
     "name" TEXT NOT NULL,
     "email" TEXT NOT NULL,
-    "password" TEXT NOT NULL,
+    "emailNormalized" TEXT NOT NULL,
+    "passwordHash" TEXT,
     "role" "UserRole" NOT NULL DEFAULT 'STAFF',
-    "isActive" BOOLEAN NOT NULL DEFAULT true,
+    "status" "UserStatus" NOT NULL DEFAULT 'INVITED',
+    "deletedAt" TIMESTAMP(3),
+    "invitedAt" TIMESTAMP(3),
+    "activatedAt" TIMESTAMP(3),
+    "passwordChangedAt" TIMESTAMP(3),
+    "lastLoginAt" TIMESTAMP(3),
     "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
     "updatedAt" TIMESTAMP(3) NOT NULL,
 
     CONSTRAINT "User_pkey" PRIMARY KEY ("id")
 );
 
+-- CreateTable
+CREATE TABLE "UserInvitation" (
+    "id" UUID NOT NULL,
+    "userId" UUID NOT NULL,
+    "tokenHash" TEXT NOT NULL,
+    "invitedById" UUID NOT NULL,
+    "email" TEXT NOT NULL,
+    "expiresAt" TIMESTAMP(3) NOT NULL,
+    "acceptedAt" TIMESTAMP(3),
+    "revokedAt" TIMESTAMP(3),
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "UserInvitation_pkey" PRIMARY KEY ("id")
+);
+
 -- CreateTable
 CREATE TABLE "Person" (
-    "id" TEXT NOT NULL,
+    "id" UUID NOT NULL,
     "firstName" TEXT NOT NULL,
     "lastName" TEXT NOT NULL,
     "department" "PersonDepartment",
     "email" TEXT,
     "phone" TEXT,
-    "userId" TEXT,
+    "userId" UUID,
-    "isActive" BOOLEAN NOT NULL DEFAULT true,
     "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
     "updatedAt" TIMESTAMP(3) NOT NULL,
+    "deletedAt" TIMESTAMP(3),
 
     CONSTRAINT "Person_pkey" PRIMARY KEY ("id")
 );
 
 -- CreateTable
 CREATE TABLE "Category" (
-    "id" TEXT NOT NULL,
+    "id" UUID NOT NULL,
     "name" TEXT NOT NULL,
     "description" TEXT,
-    "isActive" BOOLEAN NOT NULL DEFAULT true,
     "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
     "updatedAt" TIMESTAMP(3) NOT NULL,
+    "deletedAt" TIMESTAMP(3),
 
     CONSTRAINT "Category_pkey" PRIMARY KEY ("id")
 );
 
 -- CreateTable
 CREATE TABLE "Item" (
-    "id" TEXT NOT NULL,
+    "id" UUID NOT NULL,
+    "sku" TEXT NOT NULL,
     "name" TEXT NOT NULL,
     "description" TEXT,
-    "categoryId" TEXT NOT NULL,
+    "trackingType" "ItemTrackingType" NOT NULL,
+    "status" "ItemStatus" NOT NULL DEFAULT 'ACTIVE',
+    "categoryId" UUID NOT NULL,
     "stock" INTEGER NOT NULL DEFAULT 0,
     "minStock" INTEGER,
-    "maxStock" INTEGER,
+    "targetStock" INTEGER,
     "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
     "updatedAt" TIMESTAMP(3) NOT NULL,
     "deletedAt" TIMESTAMP(3),
@@ -70,29 +115,38 @@ CREATE TABLE "Item" (
 
 -- CreateTable
 CREATE TABLE "Asset" (
-    "id" TEXT NOT NULL,
+    "id" UUID NOT NULL,
-    "itemId" TEXT,
+    "assetTag" TEXT,
     "serialNumber" TEXT NOT NULL,
+    "itemId" UUID NOT NULL,
+    "status" "AssetStatus" NOT NULL DEFAULT 'AVAILABLE',
+    "manufacturer" TEXT,
+    "model" TEXT,
     "deliveryNote" TEXT,
-    "status" "ItemStatus" NOT NULL DEFAULT 'AVAILABLE',
+    "invoiceNumber" TEXT,
+    "purchaseDate" TIMESTAMP(3),
+    "purchasePrice" DECIMAL(12,2),
+    "warrantyEndsAt" TIMESTAMP(3),
     "notes" TEXT,
+    "retiredAt" TIMESTAMP(3),
     "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
     "updatedAt" TIMESTAMP(3) NOT NULL,
+    "deletedAt" TIMESTAMP(3),
 
     CONSTRAINT "Asset_pkey" PRIMARY KEY ("id")
 );
 
 -- CreateTable
 CREATE TABLE "Assignment" (
-    "id" TEXT NOT NULL,
+    "id" UUID NOT NULL,
-    "quantity" INTEGER,
+    "personId" UUID NOT NULL,
+    "status" "AssignmentStatus" NOT NULL DEFAULT 'OPEN',
+    "assignedAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "dueAt" TIMESTAMP(3),
+    "closedAt" TIMESTAMP(3),
     "notes" TEXT,
-    "itemId" TEXT,
+    "createdById" UUID NOT NULL,
-    "assetId" TEXT,
+    "closedById" UUID,
-    "personId" TEXT,
-    "assignmentDate" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    "returnDate" TIMESTAMP(3),
-    "createdBy" TEXT NOT NULL,
     "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
     "updatedAt" TIMESTAMP(3) NOT NULL,
 
@@ -100,29 +154,135 @@ CREATE TABLE "Assignment" (
 );
 
 -- CreateTable
-CREATE TABLE "Movement" (
+CREATE TABLE "AssignmentStockLine" (
-    "id" TEXT NOT NULL,
+    "id" UUID NOT NULL,
-    "type" "MovementType" NOT NULL DEFAULT 'IN',
+    "assignmentId" UUID NOT NULL,
+    "itemId" UUID NOT NULL,
     "quantity" INTEGER NOT NULL,
-    "details" TEXT,
+    "returnedQuantity" INTEGER NOT NULL DEFAULT 0,
+    "notes" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "AssignmentStockLine_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "AssignmentStockReturn" (
+    "id" UUID NOT NULL,
+    "assignmentLineId" UUID NOT NULL,
+    "quantity" INTEGER NOT NULL,
+    "returnedAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "receivedById" UUID NOT NULL,
     "notes" TEXT,
-    "itemId" TEXT,
-    "assetId" TEXT,
-    "previousStock" INTEGER,
-    "newStock" INTEGER,
-    "personId" TEXT,
-    "assignmentId" TEXT,
-    "userId" TEXT NOT NULL,
     "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
 
-    CONSTRAINT "Movement_pkey" PRIMARY KEY ("id")
+    CONSTRAINT "AssignmentStockReturn_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "AssignmentAssetLine" (
+    "id" UUID NOT NULL,
+    "assignmentId" UUID NOT NULL,
+    "assetId" UUID NOT NULL,
+    "assignedAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "returnedAt" TIMESTAMP(3),
+    "returnedById" UUID,
+    "returnStatus" "AssetStatus",
+    "notes" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "AssignmentAssetLine_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "InventoryMovement" (
+    "id" UUID NOT NULL,
+    "type" "InventoryMovementType" NOT NULL,
+    "reason" "InventoryMovementReason" NOT NULL,
+    "assignmentId" UUID,
+    "reference" TEXT,
+    "details" TEXT,
+    "notes" TEXT,
+    "performedById" UUID NOT NULL,
+    "occurredAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "InventoryMovement_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "StockMovementLine" (
+    "id" UUID NOT NULL,
+    "movementId" UUID NOT NULL,
+    "itemId" UUID NOT NULL,
+    "stockDelta" INTEGER NOT NULL,
+    "previousStock" INTEGER NOT NULL,
+    "newStock" INTEGER NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "StockMovementLine_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "AssetMovementLine" (
+    "id" UUID NOT NULL,
+    "movementId" UUID NOT NULL,
+    "assetId" UUID NOT NULL,
+    "previousStatus" "AssetStatus",
+    "newStatus" "AssetStatus" NOT NULL,
+    "notes" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "AssetMovementLine_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "StockAlert" (
+    "id" UUID NOT NULL,
+    "itemId" UUID NOT NULL,
+    "trigger" "StockAlertTrigger" NOT NULL,
+    "status" "StockAlertStatus" NOT NULL DEFAULT 'OPEN',
+    "availableStock" INTEGER NOT NULL,
+    "minimumStock" INTEGER NOT NULL,
+    "suggestedPurchase" INTEGER,
+    "triggeredAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "acknowledgedAt" TIMESTAMP(3),
+    "acknowledgedById" UUID,
+    "resolvedAt" TIMESTAMP(3),
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "StockAlert_pkey" PRIMARY KEY ("id")
 );
 
 -- CreateIndex
-CREATE UNIQUE INDEX "User_email_key" ON "User"("email");
+CREATE UNIQUE INDEX "User_emailNormalized_key" ON "User"("emailNormalized");
 
 -- CreateIndex
-CREATE UNIQUE INDEX "Person_email_key" ON "Person"("email");
+CREATE INDEX "User_status_idx" ON "User"("status");
+
+-- CreateIndex
+CREATE INDEX "User_deletedAt_idx" ON "User"("deletedAt");
+
+-- CreateIndex
+CREATE INDEX "User_createdAt_idx" ON "User"("createdAt");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "UserInvitation_tokenHash_key" ON "UserInvitation"("tokenHash");
+
+-- CreateIndex
+CREATE INDEX "UserInvitation_userId_idx" ON "UserInvitation"("userId");
+
+-- CreateIndex
+CREATE INDEX "UserInvitation_expiresAt_idx" ON "UserInvitation"("expiresAt");
+
+-- CreateIndex
+CREATE INDEX "UserInvitation_acceptedAt_idx" ON "UserInvitation"("acceptedAt");
+
+-- CreateIndex
+CREATE INDEX "UserInvitation_revokedAt_idx" ON "UserInvitation"("revokedAt");
 
 -- CreateIndex
 CREATE UNIQUE INDEX "Person_userId_key" ON "Person"("userId");
@@ -131,61 +291,127 @@ CREATE UNIQUE INDEX "Person_userId_key" ON "Person"("userId");
 CREATE INDEX "Person_lastName_firstName_idx" ON "Person"("lastName", "firstName");
 
 -- CreateIndex
-CREATE INDEX "Person_department_idx" ON "Person"("department");
+CREATE INDEX "Person_department_deletedAt_idx" ON "Person"("department", "deletedAt");
+
+-- CreateIndex
+CREATE INDEX "Person_deletedAt_idx" ON "Person"("deletedAt");
 
 -- CreateIndex
 CREATE UNIQUE INDEX "Category_name_key" ON "Category"("name");
 
 -- CreateIndex
-CREATE INDEX "Category_name_idx" ON "Category"("name");
+CREATE INDEX "Category_deletedAt_idx" ON "Category"("deletedAt");
 
 -- CreateIndex
-CREATE UNIQUE INDEX "Item_name_key" ON "Item"("name");
+CREATE UNIQUE INDEX "Item_sku_key" ON "Item"("sku");
 
 -- CreateIndex
-CREATE INDEX "Item_categoryId_idx" ON "Item"("categoryId");
+CREATE INDEX "Item_categoryId_status_idx" ON "Item"("categoryId", "status");
+
+-- CreateIndex
+CREATE INDEX "Item_trackingType_status_idx" ON "Item"("trackingType", "status");
+
+-- CreateIndex
+CREATE INDEX "Item_name_idx" ON "Item"("name");
+
+-- CreateIndex
+CREATE INDEX "Item_deletedAt_idx" ON "Item"("deletedAt");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "Asset_assetTag_key" ON "Asset"("assetTag");
 
 -- CreateIndex
 CREATE UNIQUE INDEX "Asset_serialNumber_key" ON "Asset"("serialNumber");
 
 -- CreateIndex
-CREATE INDEX "Asset_serialNumber_idx" ON "Asset"("serialNumber");
+CREATE INDEX "Asset_itemId_status_idx" ON "Asset"("itemId", "status");
-
--- CreateIndex
-CREATE INDEX "Asset_itemId_idx" ON "Asset"("itemId");
 
 -- CreateIndex
 CREATE INDEX "Asset_status_idx" ON "Asset"("status");
 
 -- CreateIndex
-CREATE UNIQUE INDEX "Assignment_assetId_key" ON "Assignment"("assetId");
+CREATE INDEX "Asset_createdAt_idx" ON "Asset"("createdAt");
 
 -- CreateIndex
-CREATE INDEX "Assignment_itemId_idx" ON "Assignment"("itemId");
+CREATE INDEX "Asset_deletedAt_idx" ON "Asset"("deletedAt");
 
 -- CreateIndex
-CREATE INDEX "Assignment_assetId_idx" ON "Assignment"("assetId");
+CREATE INDEX "Assignment_personId_status_idx" ON "Assignment"("personId", "status");
 
 -- CreateIndex
-CREATE INDEX "Assignment_personId_idx" ON "Assignment"("personId");
+CREATE INDEX "Assignment_personId_assignedAt_idx" ON "Assignment"("personId", "assignedAt");
 
 -- CreateIndex
-CREATE INDEX "Assignment_createdBy_idx" ON "Assignment"("createdBy");
+CREATE INDEX "Assignment_status_assignedAt_idx" ON "Assignment"("status", "assignedAt");
 
 -- CreateIndex
-CREATE INDEX "Movement_itemId_idx" ON "Movement"("itemId");
+CREATE INDEX "Assignment_dueAt_idx" ON "Assignment"("dueAt");
 
 -- CreateIndex
-CREATE INDEX "Movement_assetId_idx" ON "Movement"("assetId");
+CREATE INDEX "Assignment_createdById_createdAt_idx" ON "Assignment"("createdById", "createdAt");
 
 -- CreateIndex
-CREATE INDEX "Movement_personId_idx" ON "Movement"("personId");
+CREATE INDEX "AssignmentStockLine_assignmentId_idx" ON "AssignmentStockLine"("assignmentId");
 
 -- CreateIndex
-CREATE INDEX "Movement_type_idx" ON "Movement"("type");
+CREATE INDEX "AssignmentStockLine_itemId_createdAt_idx" ON "AssignmentStockLine"("itemId", "createdAt");
 
 -- CreateIndex
-CREATE INDEX "Movement_userId_idx" ON "Movement"("userId");
+CREATE INDEX "AssignmentStockReturn_assignmentLineId_returnedAt_idx" ON "AssignmentStockReturn"("assignmentLineId", "returnedAt");
+
+-- CreateIndex
+CREATE INDEX "AssignmentStockReturn_receivedById_returnedAt_idx" ON "AssignmentStockReturn"("receivedById", "returnedAt");
+
+-- CreateIndex
+CREATE INDEX "AssignmentAssetLine_assignmentId_idx" ON "AssignmentAssetLine"("assignmentId");
+
+-- CreateIndex
+CREATE INDEX "AssignmentAssetLine_assetId_assignedAt_idx" ON "AssignmentAssetLine"("assetId", "assignedAt");
+
+-- CreateIndex
+CREATE INDEX "AssignmentAssetLine_returnedAt_idx" ON "AssignmentAssetLine"("returnedAt");
+
+-- CreateIndex
+CREATE INDEX "InventoryMovement_type_occurredAt_idx" ON "InventoryMovement"("type", "occurredAt");
+
+-- CreateIndex
+CREATE INDEX "InventoryMovement_reason_occurredAt_idx" ON "InventoryMovement"("reason", "occurredAt");
+
+-- CreateIndex
+CREATE INDEX "InventoryMovement_assignmentId_idx" ON "InventoryMovement"("assignmentId");
+
+-- CreateIndex
+CREATE INDEX "InventoryMovement_performedById_occurredAt_idx" ON "InventoryMovement"("performedById", "occurredAt");
+
+-- CreateIndex
+CREATE INDEX "InventoryMovement_occurredAt_idx" ON "InventoryMovement"("occurredAt");
+
+-- CreateIndex
+CREATE INDEX "StockMovementLine_movementId_idx" ON "StockMovementLine"("movementId");
+
+-- CreateIndex
+CREATE INDEX "StockMovementLine_itemId_createdAt_idx" ON "StockMovementLine"("itemId", "createdAt");
+
+-- CreateIndex
+CREATE INDEX "AssetMovementLine_assetId_createdAt_idx" ON "AssetMovementLine"("assetId", "createdAt");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "AssetMovementLine_movementId_assetId_key" ON "AssetMovementLine"("movementId", "assetId");
+
+-- CreateIndex
+CREATE INDEX "StockAlert_itemId_status_idx" ON "StockAlert"("itemId", "status");
+
+-- CreateIndex
+CREATE INDEX "StockAlert_status_triggeredAt_idx" ON "StockAlert"("status", "triggeredAt");
+
+-- CreateIndex
+CREATE INDEX "StockAlert_trigger_triggeredAt_idx" ON "StockAlert"("trigger", "triggeredAt");
+
+-- AddForeignKey
+ALTER TABLE "UserInvitation" ADD CONSTRAINT "UserInvitation_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "UserInvitation" ADD CONSTRAINT "UserInvitation_invitedById_fkey" FOREIGN KEY ("invitedById") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
 ALTER TABLE "Person" ADD CONSTRAINT "Person_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE SET NULL ON UPDATE CASCADE;
@@ -194,31 +420,335 @@ ALTER TABLE "Person" ADD CONSTRAINT "Person_userId_fkey" FOREIGN KEY ("userId")
 ALTER TABLE "Item" ADD CONSTRAINT "Item_categoryId_fkey" FOREIGN KEY ("categoryId") REFERENCES "Category"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Asset" ADD CONSTRAINT "Asset_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "Item"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+ALTER TABLE "Asset" ADD CONSTRAINT "Asset_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "Item"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Assignment" ADD CONSTRAINT "Assignment_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "Item"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+ALTER TABLE "Assignment" ADD CONSTRAINT "Assignment_personId_fkey" FOREIGN KEY ("personId") REFERENCES "Person"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Assignment" ADD CONSTRAINT "Assignment_assetId_fkey" FOREIGN KEY ("assetId") REFERENCES "Asset"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+ALTER TABLE "Assignment" ADD CONSTRAINT "Assignment_createdById_fkey" FOREIGN KEY ("createdById") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Assignment" ADD CONSTRAINT "Assignment_personId_fkey" FOREIGN KEY ("personId") REFERENCES "Person"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE "Assignment" ADD CONSTRAINT "Assignment_closedById_fkey" FOREIGN KEY ("closedById") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Assignment" ADD CONSTRAINT "Assignment_createdBy_fkey" FOREIGN KEY ("createdBy") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+ALTER TABLE "AssignmentStockLine" ADD CONSTRAINT "AssignmentStockLine_assignmentId_fkey" FOREIGN KEY ("assignmentId") REFERENCES "Assignment"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Movement" ADD CONSTRAINT "Movement_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "Item"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+ALTER TABLE "AssignmentStockLine" ADD CONSTRAINT "AssignmentStockLine_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "Item"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Movement" ADD CONSTRAINT "Movement_assetId_fkey" FOREIGN KEY ("assetId") REFERENCES "Asset"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+ALTER TABLE "AssignmentStockReturn" ADD CONSTRAINT "AssignmentStockReturn_assignmentLineId_fkey" FOREIGN KEY ("assignmentLineId") REFERENCES "AssignmentStockLine"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Movement" ADD CONSTRAINT "Movement_personId_fkey" FOREIGN KEY ("personId") REFERENCES "Person"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+ALTER TABLE "AssignmentStockReturn" ADD CONSTRAINT "AssignmentStockReturn_receivedById_fkey" FOREIGN KEY ("receivedById") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Movement" ADD CONSTRAINT "Movement_assignmentId_fkey" FOREIGN KEY ("assignmentId") REFERENCES "Assignment"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+ALTER TABLE "AssignmentAssetLine" ADD CONSTRAINT "AssignmentAssetLine_assignmentId_fkey" FOREIGN KEY ("assignmentId") REFERENCES "Assignment"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
 -- AddForeignKey
-ALTER TABLE "Movement" ADD CONSTRAINT "Movement_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+ALTER TABLE "AssignmentAssetLine" ADD CONSTRAINT "AssignmentAssetLine_assetId_fkey" FOREIGN KEY ("assetId") REFERENCES "Asset"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "AssignmentAssetLine" ADD CONSTRAINT "AssignmentAssetLine_returnedById_fkey" FOREIGN KEY ("returnedById") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "InventoryMovement" ADD CONSTRAINT "InventoryMovement_assignmentId_fkey" FOREIGN KEY ("assignmentId") REFERENCES "Assignment"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "InventoryMovement" ADD CONSTRAINT "InventoryMovement_performedById_fkey" FOREIGN KEY ("performedById") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "StockMovementLine" ADD CONSTRAINT "StockMovementLine_movementId_fkey" FOREIGN KEY ("movementId") REFERENCES "InventoryMovement"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "StockMovementLine" ADD CONSTRAINT "StockMovementLine_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "Item"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "AssetMovementLine" ADD CONSTRAINT "AssetMovementLine_movementId_fkey" FOREIGN KEY ("movementId") REFERENCES "InventoryMovement"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "AssetMovementLine" ADD CONSTRAINT "AssetMovementLine_assetId_fkey" FOREIGN KEY ("assetId") REFERENCES "Asset"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "StockAlert" ADD CONSTRAINT "StockAlert_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "Item"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "StockAlert" ADD CONSTRAINT "StockAlert_acknowledgedById_fkey" FOREIGN KEY ("acknowledgedById") REFERENCES "User"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+
+
+-- =====================================================
+-- USER INVITATION / ACTIVATION
+-- =====================================================
+
+ALTER TABLE "User"
+ADD CONSTRAINT "User_invited_without_password"
+CHECK (
+  "status" <> 'INVITED'
+  OR "passwordHash" IS NULL
+);
+
+ALTER TABLE "User"
+ADD CONSTRAINT "User_active_requires_password"
+CHECK (
+  "status" <> 'ACTIVE'
+  OR "passwordHash" IS NOT NULL
+);
+
+ALTER TABLE "User"
+ADD CONSTRAINT "User_active_requires_activation_date"
+CHECK (
+  "status" <> 'ACTIVE'
+  OR "activatedAt" IS NOT NULL
+);
+
+ALTER TABLE "User"
+ADD CONSTRAINT "User_activation_date_after_invitation"
+CHECK (
+  "activatedAt" IS NULL
+  OR "invitedAt" IS NULL
+  OR "activatedAt" >= "invitedAt"
+);
+
+ALTER TABLE "User"
+ADD CONSTRAINT "User_password_changed_after_invitation"
+CHECK (
+  "passwordChangedAt" IS NULL
+  OR "invitedAt" IS NULL
+  OR "passwordChangedAt" >= "invitedAt"
+);
+
+ALTER TABLE "UserInvitation"
+ADD CONSTRAINT "UserInvitation_expiry_after_creation"
+CHECK ("expiresAt" > "createdAt");
+
+ALTER TABLE "UserInvitation"
+ADD CONSTRAINT "UserInvitation_accepted_or_revoked"
+CHECK (
+  "acceptedAt" IS NULL
+  OR "revokedAt" IS NULL
+);
+
+ALTER TABLE "UserInvitation"
+ADD CONSTRAINT "UserInvitation_accepted_after_creation"
+CHECK (
+  "acceptedAt" IS NULL
+  OR "acceptedAt" >= "createdAt"
+);
+
+ALTER TABLE "UserInvitation"
+ADD CONSTRAINT "UserInvitation_revoked_after_creation"
+CHECK (
+  "revokedAt" IS NULL
+  OR "revokedAt" >= "createdAt"
+);
+
+CREATE UNIQUE INDEX "UserInvitation_active_user_key"
+ON "UserInvitation" ("userId")
+WHERE "acceptedAt" IS NULL
+  AND "revokedAt" IS NULL;
+
+
+-- =====================================================
+-- ITEM STOCK
+-- =====================================================
+
+ALTER TABLE "Item"
+ADD CONSTRAINT "Item_stock_non_negative"
+CHECK ("stock" >= 0);
+
+ALTER TABLE "Item"
+ADD CONSTRAINT "Item_min_stock_non_negative"
+CHECK (
+  "minStock" IS NULL
+  OR "minStock" >= 0
+);
+
+ALTER TABLE "Item"
+ADD CONSTRAINT "Item_target_stock_non_negative"
+CHECK (
+  "targetStock" IS NULL
+  OR "targetStock" >= 0
+);
+
+ALTER TABLE "Item"
+ADD CONSTRAINT "Item_target_not_below_minimum"
+CHECK (
+  "minStock" IS NULL
+  OR "targetStock" IS NULL
+  OR "targetStock" >= "minStock"
+);
+
+ALTER TABLE "Item"
+ADD CONSTRAINT "Item_serialized_stock_zero"
+CHECK (
+  "trackingType" <> 'SERIALIZED'
+  OR "stock" = 0
+);
+
+
+-- =====================================================
+-- ASSET DATA
+-- =====================================================
+
+ALTER TABLE "Asset"
+ADD CONSTRAINT "Asset_purchase_price_non_negative"
+CHECK (
+  "purchasePrice" IS NULL
+  OR "purchasePrice" >= 0
+);
+
+ALTER TABLE "Asset"
+ADD CONSTRAINT "Asset_warranty_date_valid"
+CHECK (
+  "warrantyEndsAt" IS NULL
+  OR "purchaseDate" IS NULL
+  OR "warrantyEndsAt" >= "purchaseDate"
+);
+
+ALTER TABLE "Asset"
+ADD CONSTRAINT "Asset_retired_date_valid"
+CHECK (
+  "retiredAt" IS NULL
+  OR "retiredAt" >= "createdAt"
+);
+
+
+-- =====================================================
+-- ASSIGNMENTS
+-- =====================================================
+
+ALTER TABLE "Assignment"
+ADD CONSTRAINT "Assignment_due_date_valid"
+CHECK (
+  "dueAt" IS NULL
+  OR "dueAt" >= "assignedAt"
+);
+
+ALTER TABLE "Assignment"
+ADD CONSTRAINT "Assignment_closed_date_valid"
+CHECK (
+  "closedAt" IS NULL
+  OR "closedAt" >= "assignedAt"
+);
+
+
+-- =====================================================
+-- QUANTITY ASSIGNMENTS
+-- =====================================================
+
+ALTER TABLE "AssignmentStockLine"
+ADD CONSTRAINT "AssignmentStockLine_quantity_positive"
+CHECK ("quantity" > 0);
+
+ALTER TABLE "AssignmentStockLine"
+ADD CONSTRAINT "AssignmentStockLine_returned_non_negative"
+CHECK ("returnedQuantity" >= 0);
+
+ALTER TABLE "AssignmentStockLine"
+ADD CONSTRAINT "AssignmentStockLine_returned_not_greater"
+CHECK ("returnedQuantity" <= "quantity");
+
+ALTER TABLE "AssignmentStockReturn"
+ADD CONSTRAINT "AssignmentStockReturn_quantity_positive"
+CHECK ("quantity" > 0);
+
+
+-- =====================================================
+-- SERIALIZED ASSET ASSIGNMENTS
+-- =====================================================
+
+ALTER TABLE "AssignmentAssetLine"
+ADD CONSTRAINT "AssignmentAssetLine_return_date_valid"
+CHECK (
+  "returnedAt" IS NULL
+  OR "returnedAt" >= "assignedAt"
+);
+
+ALTER TABLE "AssignmentAssetLine"
+ADD CONSTRAINT "AssignmentAssetLine_return_data_consistent"
+CHECK (
+  (
+    "returnedAt" IS NULL
+    AND "returnedById" IS NULL
+    AND "returnStatus" IS NULL
+  )
+  OR
+  (
+    "returnedAt" IS NOT NULL
+    AND "returnedById" IS NOT NULL
+    AND "returnStatus" IS NOT NULL
+  )
+);
+
+CREATE UNIQUE INDEX "AssignmentAssetLine_active_asset_key"
+ON "AssignmentAssetLine" ("assetId")
+WHERE "returnedAt" IS NULL;
+
+
+-- =====================================================
+-- STOCK MOVEMENTS
+-- =====================================================
+
+ALTER TABLE "StockMovementLine"
+ADD CONSTRAINT "StockMovementLine_stock_consistency"
+CHECK (
+  "newStock" = "previousStock" + "stockDelta"
+);
+
+ALTER TABLE "StockMovementLine"
+ADD CONSTRAINT "StockMovementLine_previous_stock_non_negative"
+CHECK ("previousStock" >= 0);
+
+ALTER TABLE "StockMovementLine"
+ADD CONSTRAINT "StockMovementLine_new_stock_non_negative"
+CHECK ("newStock" >= 0);
+
+ALTER TABLE "StockMovementLine"
+ADD CONSTRAINT "StockMovementLine_delta_not_zero"
+CHECK ("stockDelta" <> 0);
+
+
+-- =====================================================
+-- STOCK ALERTS
+-- =====================================================
+
+ALTER TABLE "StockAlert"
+ADD CONSTRAINT "StockAlert_available_stock_non_negative"
+CHECK ("availableStock" >= 0);
+
+ALTER TABLE "StockAlert"
+ADD CONSTRAINT "StockAlert_minimum_stock_non_negative"
+CHECK ("minimumStock" >= 0);
+
+ALTER TABLE "StockAlert"
+ADD CONSTRAINT "StockAlert_suggested_purchase_non_negative"
+CHECK (
+  "suggestedPurchase" IS NULL
+  OR "suggestedPurchase" >= 0
+);
+
+ALTER TABLE "StockAlert"
+ADD CONSTRAINT "StockAlert_acknowledgement_consistent"
+CHECK (
+  (
+    "acknowledgedAt" IS NULL
+    AND "acknowledgedById" IS NULL
+  )
+  OR
+  (
+    "acknowledgedAt" IS NOT NULL
+    AND "acknowledgedById" IS NOT NULL
+  )
+);
+
+ALTER TABLE "StockAlert"
+ADD CONSTRAINT "StockAlert_resolution_date_valid"
+CHECK (
+  "resolvedAt" IS NULL
+  OR "resolvedAt" >= "triggeredAt"
+);
+
+CREATE UNIQUE INDEX "StockAlert_active_item_trigger_key"
+ON "StockAlert" ("itemId", "trigger")
+WHERE "status" IN ('OPEN', 'ACKNOWLEDGED');

prisma/schema.prisma

@@ -14,6 +14,10 @@ datasource db {
   provider = "postgresql"
 }
 
+// ======================================================
+// USERS
+// ======================================================
+
 enum UserRole {
   ADMIN
   MANAGER
@@ -21,20 +25,91 @@ enum UserRole {
   VIEWER
 }
 
+enum UserStatus {
+  INVITED
+  ACTIVE
+  SUSPENDED
+  DISABLED
+}
+
 model User {
-  id          String       @id @default(uuid())
+  id String @id @default(uuid(7)) @db.Uuid
+
   name            String
-  email       String       @unique
+  email           String
-  password    String
+  emailNormalized String @unique
+
+  /**
+   * Nulo mientras el usuario no haya aceptado la invitación.
+   */
+  passwordHash String?
+
   role   UserRole   @default(STAFF)
-  isActive    Boolean      @default(true)
+  status UserStatus @default(INVITED)
+
+  deletedAt DateTime?
+
+  invitedAt         DateTime?
+  activatedAt       DateTime?
+  passwordChangedAt DateTime?
+  lastLoginAt       DateTime?
+
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
-  movements   Movement[]
+
-  assignments Assignment[]
   person Person?
+
+  createdAssignments Assignment[] @relation("AssignmentCreatedBy")
+  closedAssignments  Assignment[] @relation("AssignmentClosedBy")
+
+  receivedStockReturns AssignmentStockReturn[]
+  receivedAssetReturns AssignmentAssetLine[]   @relation("AssetReturnedBy")
+
+  movements InventoryMovement[]
+
+  acknowledgedStockAlerts StockAlert[] @relation("StockAlertAcknowledgedBy")
+
+  sentInvitations UserInvitation[] @relation("UserInvitationInvitedBy")
+  invitations     UserInvitation[]
+
+  @@index([status])
+  @@index([deletedAt])
+  @@index([createdAt])
 }
 
+model UserInvitation {
+  id String @id @default(uuid(7)) @db.Uuid
+
+  userId String @db.Uuid
+  user   User   @relation(fields: [userId], references: [id], onDelete: Cascade, onUpdate: Cascade)
+
+  /**
+   * Hash del token de invitación.
+   * Nunca guardar el token plano.
+   */
+  tokenHash String @unique
+
+  invitedById String @db.Uuid
+  invitedBy   User   @relation("UserInvitationInvitedBy", fields: [invitedById], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  email String
+
+  expiresAt  DateTime
+  acceptedAt DateTime?
+  revokedAt  DateTime?
+
+  createdAt DateTime @default(now())
+
+  @@index([userId])
+  @@index([expiresAt])
+  @@index([acceptedAt])
+  @@index([revokedAt])
+}
+
+// ======================================================
+// PEOPLE
+// ======================================================
+
 enum PersonDepartment {
   IT
   ENGINEERING
@@ -47,139 +122,458 @@ enum PersonDepartment {
 }
 
 model Person {
-  id          String            @id @default(uuid())
+  id         String            @id @default(uuid(7)) @db.Uuid
   firstName  String
   lastName   String
   department PersonDepartment?
-  email       String?           @unique
+
+  email String?
   phone String?
-  userId      String?           @unique
+
+  userId String? @unique @db.Uuid
   user   User?   @relation(fields: [userId], references: [id], onDelete: SetNull, onUpdate: Cascade)
-  isActive    Boolean           @default(true)
-  createdAt   DateTime          @default(now())
-  updatedAt   DateTime          @updatedAt
-  assignments Assignment[]
-  movements   Movement[]
 
-  @@index([lastName, firstName])
-  @@index([department])
-}
-
-model Category {
-  id          String   @id @default(uuid())
-  name        String   @unique
-  description String?
-  isActive    Boolean  @default(true)
-  items       Item[]
-  createdAt   DateTime @default(now())
-  updatedAt   DateTime @updatedAt
-
-  @@index([name])
-}
-
-enum ItemStatus {
-  AVAILABLE
-  ASSIGNED
-  RESERVED
-  IN_REPAIR
-  BROKEN
-  STOLEN
-  DISPOSED
-}
-
-model Item {
-  id          String       @id @default(uuid())
-  name        String       @unique
-  description String?
-  categoryId  String
-  category    Category     @relation(fields: [categoryId], references: [id])
-  stock       Int          @default(0)
-  minStock    Int?
-  maxStock    Int?
   createdAt DateTime  @default(now())
   updatedAt DateTime  @updatedAt
   deletedAt DateTime?
-  movements   Movement[]
+
   assignments Assignment[]
+
+  @@index([lastName, firstName])
+  @@index([department, deletedAt])
+  @@index([deletedAt])
+}
+
+// ======================================================
+// CATALOG
+// ======================================================
+
+enum ItemTrackingType {
+  QUANTITY
+  SERIALIZED
+}
+
+enum ItemStatus {
+  ACTIVE
+  DISCONTINUED
+  ARCHIVED
+}
+
+model Category {
+  id          String  @id @default(uuid(7)) @db.Uuid
+  name        String  @unique
+  description String?
+
+  createdAt DateTime  @default(now())
+  updatedAt DateTime  @updatedAt
+  deletedAt DateTime?
+
+  items Item[]
+
+  @@index([deletedAt])
+}
+
+model Item {
+  id          String  @id @default(uuid(7)) @db.Uuid
+  sku         String  @unique
+  name        String
+  description String?
+
+  trackingType ItemTrackingType
+  status       ItemStatus       @default(ACTIVE)
+
+  categoryId String   @db.Uuid
+  category   Category @relation(fields: [categoryId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  /**
+   * Solo se utiliza para artículos QUANTITY.
+   * Para artículos SERIALIZED, las existencias se obtienen
+   * contando los activos AVAILABLE.
+   */
+  stock Int @default(0)
+
+  /**
+   * Umbral de alerta.
+   * QUANTITY:
+   * Se compara contra Item.stock.
+   * SERIALIZED:
+   * Se compara contra número de Asset AVAILABLE.
+   */
+  minStock Int?
+
+  /**
+   * Nivel deseado tras reposición.
+   * Compra sugerida:
+   * targetStock - stock disponible.
+   */
+  targetStock Int?
+
+  createdAt DateTime  @default(now())
+  updatedAt DateTime  @updatedAt
+  deletedAt DateTime?
+
   assets Asset[]
 
-  @@index([categoryId])
+  assignmentStockLines AssignmentStockLine[]
+  stockMovementLines   StockMovementLine[]
+
+  stockAlerts StockAlert[]
+
+  @@index([categoryId, status])
+  @@index([trackingType, status])
+  @@index([name])
+  @@index([deletedAt])
+}
+
+// ======================================================
+// SERIALIZED ASSETS
+// ======================================================
+
+enum AssetStatus {
+  AVAILABLE
+  ASSIGNED
+  IN_REPAIR
+  BROKEN
+  LOST
+  STOLEN
+  DISPOSED
+  RETIRED
 }
 
 model Asset {
-  id           String      @id @default(uuid())
+  id String @id @default(uuid(7)) @db.Uuid
-  itemId       String?
+
-  item         Item?       @relation(fields: [itemId], references: [id])
+  /**
+   * Identificador interno visible.
+   * Ejemplos:
+   * IT-000001
+   * LAP-000042
+   * MON-000117
+   */
+  assetTag String? @unique
+
+  /**
+   * Número de serie del fabricante.
+   * Puede ser nulo.
+   */
   serialNumber String @unique
+
+  itemId String @db.Uuid
+  item   Item   @relation(fields: [itemId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  status AssetStatus @default(AVAILABLE)
+
+  manufacturer String?
+  model        String?
+
   deliveryNote  String?
-  status       ItemStatus  @default(AVAILABLE)
+  invoiceNumber String?
+
+  purchaseDate  DateTime?
+  purchasePrice Decimal?  @db.Decimal(12, 2)
+
+  warrantyEndsAt DateTime?
+
   notes String?
+
+  retiredAt DateTime?
+
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
-  movements    Movement[]
-  assignment   Assignment?
 
-  @@index([serialNumber])
+  deletedAt DateTime?
-  @@index([itemId])
+
+  assignmentLines AssignmentAssetLine[]
+  movementLines   AssetMovementLine[]
+
+  @@index([itemId, status])
   @@index([status])
+  @@index([createdAt])
+  @@index([deletedAt])
+}
+
+// ======================================================
+// ASSIGNMENTS
+// ======================================================
+
+enum AssignmentStatus {
+  OPEN
+  PARTIALLY_RETURNED
+  RETURNED
+  CANCELLED
 }
 
 model Assignment {
-  id             String     @id @default(uuid())
+  id String @id @default(uuid(7)) @db.Uuid
-  quantity       Int?
+
+  personId String @db.Uuid
+  person   Person @relation(fields: [personId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  status AssignmentStatus @default(OPEN)
+
+  assignedAt DateTime  @default(now())
+  dueAt      DateTime?
+  closedAt   DateTime?
+
   notes String?
-  itemId         String?
+
-  item           Item?      @relation(fields: [itemId], references: [id], onDelete: SetNull, onUpdate: Cascade)
+  createdById String @db.Uuid
-  assetId        String?    @unique
+  createdBy   User   @relation("AssignmentCreatedBy", fields: [createdById], references: [id], onDelete: Restrict, onUpdate: Cascade)
-  asset          Asset?     @relation(fields: [assetId], references: [id], onDelete: SetNull, onUpdate: Cascade)
+
-  personId       String?
+  closedById String? @db.Uuid
-  person         Person?    @relation(fields: [personId], references: [id], onDelete: Cascade, onUpdate: Cascade)
+  closedBy   User?   @relation("AssignmentClosedBy", fields: [closedById], references: [id], onDelete: Restrict, onUpdate: Cascade)
-  assignmentDate DateTime   @default(now())
+
-  returnDate     DateTime?
-  createdBy      String
-  createdUser    User       @relation(fields: [createdBy], references: [id])
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
-  movement       Movement[]
 
-  @@index([itemId])
+  stockLines AssignmentStockLine[]
-  @@index([assetId])
+  assetLines AssignmentAssetLine[]
-  @@index([personId])
+  movements  InventoryMovement[]
-  @@index([createdBy])
+
+  @@index([personId, status])
+  @@index([personId, assignedAt])
+  @@index([status, assignedAt])
+  @@index([dueAt])
+  @@index([createdById, createdAt])
 }
 
-enum MovementType {
+// ======================================================
-  IN
+// QUANTITY ASSIGNMENTS
-  OUT
+// ======================================================
+
+model AssignmentStockLine {
+  id String @id @default(uuid(7)) @db.Uuid
+
+  assignmentId String     @db.Uuid
+  assignment   Assignment @relation(fields: [assignmentId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  itemId String @db.Uuid
+  item   Item   @relation(fields: [itemId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  quantity         Int
+  returnedQuantity Int @default(0)
+
+  notes String?
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  returns AssignmentStockReturn[]
+
+  @@index([assignmentId])
+  @@index([itemId, createdAt])
+}
+
+model AssignmentStockReturn {
+  id String @id @default(uuid(7)) @db.Uuid
+
+  assignmentLineId String              @db.Uuid
+  assignmentLine   AssignmentStockLine @relation(fields: [assignmentLineId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  quantity Int
+
+  returnedAt DateTime @default(now())
+
+  receivedById String @db.Uuid
+  receivedBy   User   @relation(fields: [receivedById], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  notes String?
+
+  createdAt DateTime @default(now())
+
+  @@index([assignmentLineId, returnedAt])
+  @@index([receivedById, returnedAt])
+}
+
+// ======================================================
+// SERIALIZED ASSET ASSIGNMENTS
+// ======================================================
+
+model AssignmentAssetLine {
+  id String @id @default(uuid(7)) @db.Uuid
+
+  assignmentId String     @db.Uuid
+  assignment   Assignment @relation(fields: [assignmentId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  assetId String @db.Uuid
+  asset   Asset  @relation(fields: [assetId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  assignedAt DateTime  @default(now())
+  returnedAt DateTime?
+
+  returnedById String? @db.Uuid
+  returnedBy   User?   @relation("AssetReturnedBy", fields: [returnedById], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  returnStatus AssetStatus?
+
+  notes String?
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  /**
+   * La unicidad de asignación activa se protege
+   * mediante índice único parcial en PostgreSQL.
+   */
+  @@index([assignmentId])
+  @@index([assetId, assignedAt])
+  @@index([returnedAt])
+}
+
+// ======================================================
+// INVENTORY MOVEMENTS
+// ======================================================
+
+enum InventoryMovementType {
+  RECEIPT
+  ISSUE
   ASSIGNMENT
   RETURN
   ADJUSTMENT
-  DELETED
+  STATUS_CHANGE
+  DISPOSAL
+  INITIAL_LOAD
 }
 
-model Movement {
+enum InventoryMovementReason {
-  id            String       @id @default(uuid())
+  PURCHASE
-  type          MovementType @default(IN)
+  MANUAL_ENTRY
-  quantity      Int
+  EMPLOYEE_ASSIGNMENT
+  EMPLOYEE_RETURN
+  INVENTORY_CORRECTION
+  DAMAGE
+  REPAIR
+  REPAIR_RETURN
+  LOSS
+  THEFT
+  DISPOSAL
+  INITIAL_LOAD
+  OTHER
+}
+
+model InventoryMovement {
+  id String @id @default(uuid(7)) @db.Uuid
+
+  type   InventoryMovementType
+  reason InventoryMovementReason
+
+  assignmentId String?     @db.Uuid
+  assignment   Assignment? @relation(fields: [assignmentId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  reference String?
+
   details String?
   notes   String?
-  itemId        String?
+
-  item          Item?        @relation(fields: [itemId], references: [id], onDelete: SetNull, onUpdate: Cascade)
+  performedById String @db.Uuid
-  assetId       String?
+  performedBy   User   @relation(fields: [performedById], references: [id], onDelete: Restrict, onUpdate: Cascade)
-  asset         Asset?       @relation(fields: [assetId], references: [id], onDelete: SetNull, onUpdate: Cascade)
+
-  previousStock Int?
+  occurredAt DateTime @default(now())
-  newStock      Int?
-  personId      String?
-  person        Person?      @relation(fields: [personId], references: [id], onDelete: SetNull, onUpdate: Cascade)
-  assignmentId  String?
-  assignment    Assignment?  @relation(fields: [assignmentId], references: [id], onDelete: SetNull, onUpdate: Cascade)
-  userId        String
-  user          User         @relation(fields: [userId], references: [id])
   createdAt  DateTime @default(now())
 
-  @@index([itemId])
+  stockLines StockMovementLine[]
-  @@index([assetId])
+  assetLines AssetMovementLine[]
-  @@index([personId])
+
-  @@index([type])
+  @@index([type, occurredAt])
-  @@index([userId])
+  @@index([reason, occurredAt])
+  @@index([assignmentId])
+  @@index([performedById, occurredAt])
+  @@index([occurredAt])
+}
+
+// ======================================================
+// QUANTITY MOVEMENTS
+// ======================================================
+
+model StockMovementLine {
+  id String @id @default(uuid(7)) @db.Uuid
+
+  movementId String            @db.Uuid
+  movement   InventoryMovement @relation(fields: [movementId], references: [id], onDelete: Cascade, onUpdate: Cascade)
+
+  itemId String @db.Uuid
+  item   Item   @relation(fields: [itemId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  /**
+   * Positivo: entrada/devolución/ajuste positivo.
+   * Negativo: salida/asignación/ajuste negativo.
+   */
+  stockDelta Int
+
+  previousStock Int
+  newStock      Int
+
+  createdAt DateTime @default(now())
+
+  @@index([movementId])
+  @@index([itemId, createdAt])
+}
+
+// ======================================================
+// SERIALIZED ASSET MOVEMENTS
+// ======================================================
+
+model AssetMovementLine {
+  id String @id @default(uuid(7)) @db.Uuid
+
+  movementId String            @db.Uuid
+  movement   InventoryMovement @relation(fields: [movementId], references: [id], onDelete: Cascade, onUpdate: Cascade)
+
+  assetId String @db.Uuid
+  asset   Asset  @relation(fields: [assetId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  previousStatus AssetStatus?
+  newStatus      AssetStatus
+
+  notes String?
+
+  createdAt DateTime @default(now())
+
+  @@unique([movementId, assetId])
+  @@index([assetId, createdAt])
+}
+
+// ======================================================
+// STOCK ALERTS
+// ======================================================
+
+enum StockAlertStatus {
+  OPEN
+  ACKNOWLEDGED
+  RESOLVED
+}
+
+enum StockAlertTrigger {
+  BELOW_MINIMUM
+  OUT_OF_STOCK
+}
+
+model StockAlert {
+  id String @id @default(uuid(7)) @db.Uuid
+
+  itemId String @db.Uuid
+  item   Item   @relation(fields: [itemId], references: [id], onDelete: Restrict, onUpdate: Cascade)
+
+  trigger StockAlertTrigger
+  status  StockAlertStatus  @default(OPEN)
+
+  availableStock    Int
+  minimumStock      Int
+  suggestedPurchase Int?
+
+  triggeredAt DateTime @default(now())
+
+  acknowledgedAt DateTime?
+
+  acknowledgedById String? @db.Uuid
+  acknowledgedBy   User?   @relation("StockAlertAcknowledgedBy", fields: [acknowledgedById], references: [id], onDelete: SetNull, onUpdate: Cascade)
+
+  resolvedAt DateTime?
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  @@index([itemId, status])
+  @@index([status, triggeredAt])
+  @@index([trigger, triggeredAt])
 }