Ensure ap_id column in users table cannot be null

priv/repo/migrations/20200811143147_ap_id_not_null.exs

@@ -0,0 +1,13 @@
+defmodule Pleroma.Repo.Migrations.ApIdNotNull do
+  use Ecto.Migration
+
+  def up do
+    alter table(:users) do
+      modify(:ap_id, :string, null: false)
+    end
+  end
+
+  def down do
+    :ok
+  end
+end