Add all

priv/repo/migrations/20250702151805_create_activities.exs

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+defmodule Nulla.Repo.Migrations.CreateActivities do
+  use Ecto.Migration
+
+  def change do
+    create table(:activities, primary_key: false) do
+      add :id, :bigint, primary_key: true
+      add :ap_id, :string
+      add :type, :string
+      add :actor, :string
+      add :object, :string
+      add :to, {:array, :string}
+      add :cc, {:array, :string}
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create index(:activities, [:ap_id])
+    create index(:activities, [:type])
+    create index(:activities, [:actor])
+  end
+end