feat: make member emails unique

priv/repo/migrations/20250926180341_add_unique_email_to_members.exs

@@ -0,0 +1,17 @@
+defmodule Mv.Repo.Migrations.AddUniqueEmailToMembers do
+  @moduledoc """
+  Updates resources based on their most recent snapshots.
+
+  This file was autogenerated with `mix ash_postgres.generate_migrations`
+  """
+
+  use Ecto.Migration
+
+  def up do
+    create unique_index(:members, [:email], name: "members_unique_email_index")
+  end
+
+  def down do
+    drop_if_exists unique_index(:members, [:email], name: "members_unique_email_index")
+  end
+end