Add POI feature and imporve the overall backend implementation

shared/clients/sales_client.py

@@ -144,7 +144,45 @@ class SalesServiceClient(BaseServiceClient):
     ) -> Optional[Dict[str, Any]]:
         """Update a product"""
         return await self.put(f"sales/products/{product_id}", data=updates, tenant_id=tenant_id)
-    
+
+    async def create_sales_record(
+        self,
+        tenant_id: str,
+        sales_data: Dict[str, Any]
+    ) -> Optional[Dict[str, Any]]:
+        """Create a new sales record
+
+        Args:
+            tenant_id: Tenant ID
+            sales_data: Sales record data including:
+                - inventory_product_id: Optional UUID for inventory tracking
+                - product_name: Product name
+                - product_category: Product category
+                - quantity_sold: Quantity sold
+                - unit_price: Unit price
+                - total_amount: Total amount
+                - sale_date: Sale date (YYYY-MM-DD)
+                - sales_channel: Sales channel (retail, wholesale, online, pos, etc.)
+                - source: Data source (manual, pos_sync, import, etc.)
+                - payment_method: Payment method
+                - notes: Optional notes
+
+        Returns:
+            Created sales record or None if failed
+        """
+        try:
+            result = await self.post("sales/sales", data=sales_data, tenant_id=tenant_id)
+            if result:
+                logger.info("Created sales record via client",
+                          tenant_id=tenant_id,
+                          product=sales_data.get("product_name"))
+            return result
+        except Exception as e:
+            logger.error("Failed to create sales record",
+                       error=str(e),
+                       tenant_id=tenant_id)
+            return None
+
     # ================================================================
     # DATA IMPORT
     # ================================================================

shared/messaging/events.py

@@ -102,3 +102,40 @@ class DataImportedEvent(BaseEvent):
             event_type="data.imported",
             correlation_id=correlation_id
         )
+
+# Procurement Events
+class PurchaseOrderApprovedEvent(BaseEvent):
+    def __init__(self, service_name: str, data: Dict[str, Any], correlation_id: Optional[str] = None):
+        super().__init__(
+            service_name=service_name,
+            data=data,
+            event_type="po.approved",
+            correlation_id=correlation_id
+        )
+
+class PurchaseOrderRejectedEvent(BaseEvent):
+    def __init__(self, service_name: str, data: Dict[str, Any], correlation_id: Optional[str] = None):
+        super().__init__(
+            service_name=service_name,
+            data=data,
+            event_type="po.rejected",
+            correlation_id=correlation_id
+        )
+
+class PurchaseOrderSentToSupplierEvent(BaseEvent):
+    def __init__(self, service_name: str, data: Dict[str, Any], correlation_id: Optional[str] = None):
+        super().__init__(
+            service_name=service_name,
+            data=data,
+            event_type="po.sent_to_supplier",
+            correlation_id=correlation_id
+        )
+
+class DeliveryReceivedEvent(BaseEvent):
+    def __init__(self, service_name: str, data: Dict[str, Any], correlation_id: Optional[str] = None):
+        super().__init__(
+            service_name=service_name,
+            data=data,
+            event_type="delivery.received",
+            correlation_id=correlation_id
+        )