Update

priv/repo/migrations/20250706120640_create_announces.exs

@@ -0,0 +1,17 @@
+defmodule Nulla.Repo.Migrations.CreateAnnounces do
+  use Ecto.Migration
+
+  def change do
+    create table(:announces, primary_key: false) do
+      add :id, :bigint, primary_key: true
+      add :actor_id, references(:actors, on_delete: :delete_all), null: false
+      add :note_id, references(:notes, on_delete: :delete_all), null: false
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create index(:announces, [:actor_id])
+    create index(:announces, [:note_id])
+    create unique_index(:announces, [:actor_id, :note_id])
+  end
+end