fix: patch for migrating default sort order

frappe/patches.txt

@@ -236,3 +236,4 @@ frappe.patches.v15_0.sanitize_workspace_titles
 frappe.patches.v15_0.migrate_role_profile_to_table_multi_select
 frappe.patches.v15_0.migrate_session_data
 frappe.custom.doctype.property_setter.patches.remove_invalid_fetch_from_expressions
+frappe.patches.v16_0.switch_default_sort_order

frappe/patches/v16_0/switch_default_sort_order.py

@@ -0,0 +1,25 @@
+import click
+
+import frappe
+from frappe.patches.v14_0.drop_unused_indexes import drop_index_if_exists
+
+
+def execute():
+	if frappe.db.db_type == "postgres":
+		return
+
+	db_tables = frappe.db.get_tables(cached=False)
+
+	doctypes = frappe.get_all(
+		"DocType",
+		{"is_virtual": 0, "istable": 0},
+		pluck="name",
+	)
+
+	for doctype in doctypes:
+		table = f"tab{doctype}"
+		if table not in db_tables:
+			continue
+		frappe.db.add_index(doctype, ["creation"], index_name="creation")
+		click.echo(f"✓ created creation index from {table}")
+		drop_index_if_exists(table, "modified")