class CreateAccountBalances < ActiveRecord::Migration[7.2] def change create_table :account_balances, id: :uuid do |t| t.references :account, null: false, type: :uuid, foreign_key: { on_delete: :cascade } t.date :date, null: false t.decimal :balance, precision: 19, scale: 4, null: false t.string :currency, default: "USD", null: false t.timestamps end add_index :account_balances, [ :account_id, :date ], unique: true end end