feat: salesitem can change/soft delete

shipment/admin.py

@@ -1,5 +1,11 @@
 from django.contrib import admin
-from .models import ExternalFinishedProduct, Shipment, SalesItem, ShipmentDelivery
+from .models import (
+    ExternalFinishedProduct,
+    SalesItem,
+    SalesItemChangeRecord,
+    Shipment,
+    ShipmentDelivery,
+)
 
 
 class SalesItemInline(admin.TabularInline):
@@ -64,10 +70,10 @@ class ShipmentAdmin(admin.ModelAdmin):
 
 @admin.register(SalesItem)
 class SalesItemAdmin(admin.ModelAdmin):
-    list_display = ['id', 'name', 'quantity', 'unit', 'position', 'shipment_status', 'printing_job_id', 'customer_id', 'created_by', 'created_at']
-    list_filter = ['unit', 'created_at', ('shipment', admin.EmptyFieldListFilter)]
+    list_display = ['id', 'name', 'quantity', 'unit', 'position', 'shipment_status', 'printing_job_id', 'customer_id', 'created_by', 'delete_at', 'delete_by', 'created_at']
+    list_filter = ['unit', 'created_at', 'delete_at', ('shipment', admin.EmptyFieldListFilter)]
     search_fields = ['name', 'shipment__customer__name', 'position', 'remark']
-    readonly_fields = ['created_at', 'updated_at', 'created_by']
+    readonly_fields = ['created_at', 'updated_at', 'created_by', 'delete_at', 'delete_by']
     raw_id_fields = ['shipment']
     
     def shipment_status(self, obj):
@@ -96,6 +102,32 @@ class ExternalFinishedProductAdmin(admin.ModelAdmin):
         super().save_model(request, obj, form, change)
 
 
+@admin.register(SalesItemChangeRecord)
+class SalesItemChangeRecordAdmin(admin.ModelAdmin):
+    list_display = [
+        "id",
+        "sales_item",
+        "operator",
+        "operated_at",
+        "created_at",
+    ]
+    list_filter = ["operated_at", "created_at"]
+    search_fields = [
+        "sales_item__name",
+        "operator__username",
+        "operator__employee__name",
+    ]
+    readonly_fields = [
+        "sales_item",
+        "operator",
+        "operated_at",
+        "before_values",
+        "after_values",
+        "created_at",
+        "updated_at",
+    ]
+
+
 @admin.register(ShipmentDelivery)
 class ShipmentDeliveryAdmin(admin.ModelAdmin):
     list_display = [