feat: add persistence for task

priv/repo/migrations/20250404184442_add_task_relation.exs

@@ -0,0 +1,11 @@
+defmodule Putzplan.Repo.Migrations.AddTaskRelation do
+  use Ecto.Migration
+
+  def change do
+    create table(:tasks, primary_key: false) do
+      add :id, :uuid, null: false, primary_key: true
+      add :description, :string, null: false
+      add :repetition_days, :integer, null: false
+    end
+  end
+end