fix: Add a patch to set is_system_generated flag

frappe/patches.txt

@@ -196,3 +196,4 @@ frappe.patches.v14_0.copy_mail_data #08.03.21
 frappe.patches.v14_0.update_github_endpoints #08-11-2021
 frappe.patches.v14_0.remove_db_aggregation
 frappe.patches.v14_0.update_color_names_in_kanban_board_column
+frappe.patches.v14_0.update_is_system_generated_flag

frappe/patches/v14_0/update_is_system_generated_flag.py

@@ -0,0 +1,17 @@
+import frappe
+
+def execute():
+	# assuming all customization generated by Admin is system generated customization
+	custom_field = frappe.qb.DocType("Custom Field")
+	(
+		frappe.qb.update(custom_field)
+		.set(custom_field.is_system_generated, True)
+		.where(custom_field.owner == 'Administrator').run()
+	)
+
+	property_setter = frappe.qb.DocType("Property Setter")
+	(
+		frappe.qb.update(property_setter)
+		.set(property_setter.is_system_generated, True)
+		.where(property_setter.owner == 'Administrator').run()
+	)