rewrite frontend and logic in core app

core/admin.py

@@ -1,7 +1,13 @@
 from django.contrib import admin
 
 from core.models import Subject, Transaction
-from financeplanner.admin import admin_site
+
+
+class CustomAdminSite(admin.AdminSite):
+    pass
+
+
+admin_site = CustomAdminSite()
 
 
 @admin.register(Subject, site=admin_site)