Many-to-many between performers and performances.

priv/repo/migrations/20210403184119_create_performer_performance.exs

@@ -0,0 +1,13 @@
+defmodule Runosaari.Repo.Migrations.CreatePerformerPerformance do
+  use Ecto.Migration
+
+  def change do
+    create table(:performer_performance, primary_key: false) do
+      add :performer_id, references(:performers, on_delete: :nothing), primary_key: true
+      add :performance_id, references(:performances, on_delete: :nothing), primary_key: true
+    end
+
+    create index(:performer_performance, [:performer_id])
+    create index(:performer_performance, [:performance_id])
+  end
+end