phase002 complete

db/migrate/20260914132022_create_maintenance_schedules.rb

@@ -0,0 +1,17 @@
+class CreateMaintenanceSchedules < ActiveRecord::Migration[8.1]
+  def change
+    create_table :maintenance_schedules do |t|
+      t.references :vehicle, null: false, foreign_key: true
+      t.string :maintenance_type, null: false
+      t.integer :mileage_interval, null: false
+      t.integer :time_interval, null: false
+
+      t.timestamps
+    end
+
+    add_index :maintenance_schedules,
+      "vehicle_id, lower(maintenance_type)",
+      unique: true,
+      name: "index_maintenance_schedules_on_vehicle_and_lower_type"
+  end
+end