add steps

priv/repo/migrations/20220726001809_create_steps.exs

@@ -0,0 +1,17 @@
+defmodule Memex.Repo.Migrations.CreateSteps do
+  use Ecto.Migration
+
+  def change do
+    create table(:steps, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+      add :title, :string
+      add :description, :text
+      add :position, :integer
+      add :pipeline_id, references(:pipelines, on_delete: :nothing, type: :binary_id)
+
+      timestamps()
+    end
+
+    create index(:steps, [:pipeline_id])
+  end
+end