adding

apps/bizapps/admin.py

@@ -0,0 +1,40 @@
+from django.contrib import admin
+
+from .models import Appointment, Customer, LedgerEntry, Product, StockMovement
+
+
+@admin.register(Customer)
+class CustomerAdmin(admin.ModelAdmin):
+    list_display = ("name", "phone", "user", "updated_at")
+    search_fields = ("name", "phone", "email", "user__phone")
+
+
+@admin.register(LedgerEntry)
+class LedgerEntryAdmin(admin.ModelAdmin):
+    list_display = ("title", "entry_type", "amount", "entry_date", "user")
+    list_filter = ("entry_type", "category")
+    search_fields = ("title", "user__phone")
+
+
+@admin.register(Product)
+class ProductAdmin(admin.ModelAdmin):
+    list_display = ("name", "sku", "category", "quantity", "unit_price", "user")
+    list_filter = ("category",)
+    search_fields = ("name", "sku", "user__phone")
+
+
+@admin.register(StockMovement)
+class StockMovementAdmin(admin.ModelAdmin):
+    list_display = ("product", "delta", "quantity_after", "created_at")
+    search_fields = ("product__name", "product__user__phone")
+    readonly_fields = ("product", "delta", "quantity_after", "note", "created_at")
+
+    def has_add_permission(self, request):
+        return False
+
+
+@admin.register(Appointment)
+class AppointmentAdmin(admin.ModelAdmin):
+    list_display = ("customer_name", "title", "start_at", "status", "user")
+    list_filter = ("status",)
+    search_fields = ("customer_name", "customer_phone", "user__phone")