feat(revshare): Add db columns for partners and self_billed invoices (#…

…3062)

## Roadmap

👉 https://getlago.canny.io/feature-requests/p/calculate-revenue-share

 ## Context

Current problem: companies with **partners** selling for them cannot
have a **revenue share** system in Lago.

We want to propose **self-billing** into Lago, a billing arrangement
where the **customer** creates and issues the invoice on **behalf** of
the **supplier** for goods or services received.

 ## Description

Add `account_type` enum to customers.

Add `self_billed` flag to invoices

app/models/customer.rb

@@ -230,6 +230,7 @@ def ensure_slug
 # Table name: customers
 #
 #  id                               :uuid             not null, primary key
+#  account_type                     :enum             default("customer"), not null
 #  address_line1                    :string
 #  address_line2                    :string
 #  city                             :string
@@ -278,6 +279,7 @@ def ensure_slug
 #
 # Indexes
 #
+#  index_customers_on_account_type                     (account_type)
 #  index_customers_on_applied_dunning_campaign_id      (applied_dunning_campaign_id)
 #  index_customers_on_deleted_at                       (deleted_at)
 #  index_customers_on_external_id_and_organization_id  (external_id,organization_id) UNIQUE WHERE (deleted_at IS NULL)

app/models/invoice.rb

@@ -474,6 +474,7 @@ def status_changed_to_finalized?
 #  progressive_billing_credit_amount_cents :bigint           default(0), not null
 #  ready_for_payment_processing            :boolean          default(TRUE), not null
 #  ready_to_be_refreshed                   :boolean          default(FALSE), not null
+#  self_billed                             :boolean          default(FALSE), not null
 #  skip_charges                            :boolean          default(FALSE), not null
 #  status                                  :integer          default("finalized"), not null
 #  sub_total_excluding_taxes_amount_cents  :bigint           default(0), not null
@@ -502,6 +503,7 @@ def status_changed_to_finalized?
 #  index_invoices_on_organization_id                (organization_id)
 #  index_invoices_on_payment_overdue                (payment_overdue)
 #  index_invoices_on_ready_to_be_refreshed          (ready_to_be_refreshed) WHERE (ready_to_be_refreshed = true)
+#  index_invoices_on_self_billed                    (self_billed)
 #  index_invoices_on_sequential_id                  (sequential_id)
 #  index_invoices_on_status                         (status)
 #

db/migrate/20250114163522_add_account_type_to_customers.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class AddAccountTypeToCustomers < ActiveRecord::Migration[7.1]
+  disable_ddl_transaction!
+
+  def change
+    create_enum :customer_account_type, %w[customer partner]
+    add_column :customers, :account_type, :enum, enum_type: "customer_account_type", default: "customer", null: false
+
+    add_index :customers, :account_type, algorithm: :concurrently
+  end
+end

db/migrate/20250114172823_add_self_billed_to_invoices.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class AddSelfBilledToInvoices < ActiveRecord::Migration[7.1]
+  disable_ddl_transaction!
+
+  def change
+    add_column :invoices, :self_billed, :boolean, default: false, null: false
+    add_index :invoices, :self_billed, algorithm: :concurrently
+  end
+end