Initial commit

server/models/InventoryHistory.js

@@ -0,0 +1,19 @@
+const mongoose = require('mongoose');
+
+const inventoryHistorySchema = new mongoose.Schema({
+  product: { type: mongoose.Schema.Types.ObjectId, ref: 'Product', required: true },
+  sku: { type: String, required: true },
+  changeType: { 
+    type: String, 
+    enum: ['Order Placed', 'Order Cancelled', 'Manual Adjustment', 'Restock', 'Returned Product'], 
+    required: true 
+  },
+  quantityChanged: { type: Number, required: true }, // positive for addition, negative for deduction
+  previousStock: { type: Number, required: true },
+  newStock: { type: Number, required: true },
+  reason: { type: String, default: '' },
+  performedBy: { type: mongoose.Schema.Types.ObjectId, ref: 'User', default: null }
+}, { timestamps: true });
+
+module.exports = mongoose.model('InventoryHistory', inventoryHistorySchema);
+