add step_context

priv/repo/migrations/20220726002021_create_step_contexts.exs

@@ -0,0 +1,16 @@
+defmodule Memex.Repo.Migrations.CreateStepContexts do
+  use Ecto.Migration
+
+  def change do
+    create table(:step_contexts, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+      add :step_id, references(:steps, on_delete: :nothing, type: :binary_id)
+      add :context_id, references(:contexts, on_delete: :nothing, type: :binary_id)
+
+      timestamps()
+    end
+
+    create index(:step_contexts, [:step_id])
+    create index(:step_contexts, [:context_id])
+  end
+end