Migration: Add sequence number.

priv/repo/migrations/20210428164502_add_sequence_number.exs

@@ -0,0 +1,13 @@
+defmodule Runosaari.Repo.Migrations.AddSequenceNumber do
+  use Ecto.Migration
+
+  def change do
+    alter table("performances") do
+      add :sequence_number, :integer
+    end
+
+    alter table("performers") do
+      add :sequence_number, :integer
+    end
+  end
+end