Soft-delete enterprise fees

These objects can hold critical information related to adjustments and tax categories. If they are hard-deleted we lose vital data that's needed by associated records.

app/models/enterprise_fee.rb

@@ -1,6 +1,8 @@
 class EnterpriseFee < ActiveRecord::Base
   include Spree::Core::CalculatedAdjustments
 
+  acts_as_paranoid
+
   belongs_to :enterprise
   belongs_to :tax_category, class_name: 'Spree::TaxCategory', foreign_key: 'tax_category_id'
 

db/migrate/20210115143738_add_deleted_at_to_enterprise_fee.rb

@@ -0,0 +1,5 @@
+class AddDeletedAtToEnterpriseFee < ActiveRecord::Migration
+  def change
+    add_column :enterprise_fees, :deleted_at, :datetime
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20201219120055) do
+ActiveRecord::Schema.define(version: 20210115143738) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -108,6 +108,7 @@ ActiveRecord::Schema.define(version: 20201219120055) do
     t.datetime "updated_at",                                        null: false
     t.integer  "tax_category_id"
     t.boolean  "inherits_tax_category",             default: false, null: false
+    t.datetime "deleted_at"
   end
 
   add_index "enterprise_fees", ["enterprise_id"], name: "index_enterprise_fees_on_enterprise_id", using: :btree