diff --git a/src/database/schemas/inventory/purchaseorder.schema.js b/src/database/schemas/inventory/purchaseorder.schema.js
index e4d8d5d..a7ee7cc 100644
--- a/src/database/schemas/inventory/purchaseorder.schema.js
+++ b/src/database/schemas/inventory/purchaseorder.schema.js
@@ -1,22 +1,100 @@
 import mongoose from 'mongoose';
 import { generateId } from '../../utils.js';
 const { Schema } = mongoose;
+import { aggregateRollups, aggregateRollupsHistory } from '../../database.js';
 
 const purchaseOrderSchema = new Schema(
   {
     _reference: { type: String, default: () => generateId()() },
-    totalAmount: { type: Number, required: true },
-    totalAmountWithTax: { type: Number, required: true },
-    totalTaxAmount: { type: Number, required: true },
+    totalAmount: { type: Number, required: true, default: 0 },
+    totalAmountWithTax: { type: Number, required: true, default: 0 },
+    shippingAmount: { type: Number, required: true, default: 0 },
+    shippingAmountWithTax: { type: Number, required: true, default: 0 },
+    grandTotalAmount: { type: Number, required: true, default: 0 },
+    totalTaxAmount: { type: Number, required: true, default: 0 },
     timestamp: { type: Date, default: Date.now },
     vendor: { type: Schema.Types.ObjectId, ref: 'vendor', required: true },
     state: {
       type: { type: String, required: true, default: 'draft' },
     },
+    postedAt: { type: Date, required: false },
+    acknowledgedAt: { type: Date, required: false },
+    cancelledAt: { type: Date, required: false },
+    completedAt: { type: Date, required: false },
   },
   { timestamps: true }
 );
 
+const rollupConfigs = [
+  {
+    name: 'draft',
+    filter: { 'state.type': 'draft' },
+    rollups: [{ name: 'draft', property: 'state.type', operation: 'count' }],
+  },
+  {
+    name: 'sent',
+    filter: { 'state.type': 'sent' },
+    rollups: [{ name: 'sent', property: 'state.type', operation: 'count' }],
+  },
+  {
+    name: 'acknowledged',
+    filter: { 'state.type': 'acknowledged' },
+    rollups: [{ name: 'acknowledged', property: 'state.type', operation: 'count' }],
+  },
+  {
+    name: 'partiallyShipped',
+    filter: { 'state.type': 'partiallyShipped' },
+    rollups: [{ name: 'partiallyShipped', property: 'state.type', operation: 'count' }],
+  },
+  {
+    name: 'shipped',
+    filter: { 'state.type': 'shipped' },
+    rollups: [{ name: 'shipped', property: 'state.type', operation: 'count' }],
+  },
+  {
+    name: 'partiallyReceived',
+    filter: { 'state.type': 'partiallyReceived' },
+    rollups: [{ name: 'partiallyReceived', property: 'state.type', operation: 'count' }],
+  },
+  {
+    name: 'received',
+    filter: { 'state.type': 'received' },
+    rollups: [{ name: 'received', property: 'state.type', operation: 'count' }],
+  },
+  {
+    name: 'cancelled',
+    filter: { 'state.type': 'cancelled' },
+    rollups: [{ name: 'cancelled', property: 'state.type', operation: 'count' }],
+  },
+  {
+    name: 'completed',
+    filter: { 'state.type': 'completed' },
+    rollups: [{ name: 'completed', property: 'state.type', operation: 'count' }],
+  },
+];
+
+purchaseOrderSchema.statics.stats = async function () {
+  const results = await aggregateRollups({
+    model: this,
+    rollupConfigs: rollupConfigs,
+  });
+
+  // Transform the results to match the expected format
+  return results;
+};
+
+purchaseOrderSchema.statics.history = async function (from, to) {
+  const results = await aggregateRollupsHistory({
+    model: this,
+    startDate: from,
+    endDate: to,
+    rollupConfigs: rollupConfigs,
+  });
+
+  // Return time-series data array
+  return results;
+};
+
 // Add virtual id getter
 purchaseOrderSchema.virtual('id').get(function () {
   return this._id;