feat(payment_terms): Backfill customers and billing_entities

Author: D1353L

db/migrate/20260819134021_backfill_payment_terms.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+class BackfillPaymentTerms < ActiveRecord::Migration[8.0]
+  disable_ddl_transaction!
+
+  # Plain AR class detached from app/models/customer.rb so the migration
+  # does not depend on the model's current enums and validations.
+  class MigrationCustomer < ActiveRecord::Base
+    self.table_name = "customers"
+  end
+
+  def up
+    safety_assured do
+      backfill_customers
+      backfill_billing_entities
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration, "backfilled payment terms cannot be distinguished from user values"
+  end
+
+  private
+
+  def backfill_customers
+    MigrationCustomer
+      .where(payment_term: nil).where.not(net_payment_term: nil)
+      .in_batches(of: 10_000) do |batch|
+        batch.update_all("payment_term = jsonb_build_object('term_type', 'net', 'days', net_payment_term)") # rubocop:disable Rails/SkipsModelValidations
+      end
+  end
+
+  def backfill_billing_entities
+    execute <<~SQL
+      UPDATE billing_entities
+      SET payment_term = jsonb_build_object('term_type', 'net', 'days', net_payment_term)
+      WHERE payment_term IS NULL AND net_payment_term IS NOT NULL
+    SQL
+  end
+end

db/structure.sql

@@ -14215,6 +14215,7 @@ ALTER TABLE ONLY public.membership_roles
 SET search_path TO "$user", public;
 
 INSERT INTO "schema_migrations" (version) VALUES
+('20260819134021'),
 ('20260819111435'),
 ('20260819111434'),
 ('20260819000710'),