Add extra bills tracking

db/migrate/20230224232804_create_extra_bills.rb

@@ -0,0 +1,11 @@
+class CreateExtraBills < ActiveRecord::Migration[7.0]
+  def change
+    create_table :extra_bills do |t|
+      t.string :description
+      t.decimal :amount
+      t.boolean :deduct_autopaid
+
+      t.timestamps
+    end
+  end
+end