Introduced invoices and deliveries. Integration (especially of deliveries) isn't finished yet.

db/migrate/20090102155714_create_invoices.rb

@@ -0,0 +1,19 @@
+class CreateInvoices < ActiveRecord::Migration
+  def self.up
+    create_table :invoices do |t|
+      t.integer :supplier_id
+      t.integer :delivery_id
+      t.string :number
+      t.date :date
+      t.date :paid_on
+      t.text :note
+      t.decimal :amount, :null => false, :precision => 8, :scale => 2, :default => 0.0
+
+      t.timestamps
+    end
+  end
+
+  def self.down
+    drop_table :invoices
+  end
+end

db/migrate/20090102171850_create_deliveries.rb

@@ -0,0 +1,13 @@
+class CreateDeliveries < ActiveRecord::Migration
+  def self.up
+    create_table :deliveries do |t|
+      t.integer :supplier_id
+      t.date :delivered_on
+      t.datetime :created_at
+    end
+  end
+
+  def self.down
+    drop_table :deliveries
+  end
+end