Add reminder about unread bookmarks

db/migrate/20240222205406_add_read_status_to_bookmarks.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  change do
+    alter_table :posts do
+      add_column :is_read, :bool, default: false
+    end
+  end
+end