Sequel.migration do

  up do
    # create tests table
    create_table(:tests) do
      primary_key :id
      foreign_key :hardware_id, :hardware
      String :name, null: false
      String :description
      DateTime :created_at, default: Sequel::CURRENT_TIMESTAMP
      DateTime :updated_at, default: Sequel::CURRENT_TIMESTAMP
    end

    # create many-to-many table between tests and benchmarks
    create_table(:benchmarks_tests) do
      primary_key :id
      foreign_key :benchmark_id, :benchmarks
      foreign_key :test_id, :tests
      DateTime :created_at, default: Sequel::CURRENT_TIMESTAMP
      DateTime :updated_at, default: Sequel::CURRENT_TIMESTAMP
    end

    # modify results table to integrate with the new tests table
    alter_table(:results) do
      drop_foreign_key :hardware_id
      add_foreign_key :test_id, :tests
    end
  end

  down do
    alter_table(:results) do
      drop_foreign_key :test_id
      add_foreign_key :hardware_id, :hardware
    end
    drop_table(:benchmarks_tests)
    drop_table(:tests)
  end

end