NEW: plans (#33)

Fixes #9

priv/repo/migrations/20200809220758_create_plans.exs

@@ -0,0 +1,16 @@
+defmodule Planner.Repo.Migrations.CreatePlans do
+  use Ecto.Migration
+
+  def change do
+    create table(:plans, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+      add :description, :string
+      add :finished_at, :naive_datetime
+      add :start, :naive_datetime
+      add :end, :naive_datetime
+      add :name, :string
+
+      timestamps()
+    end
+  end
+end

priv/repo/migrations/20200809221238_create_plan_details.exs

@@ -0,0 +1,18 @@
+defmodule Planner.Repo.Migrations.CreatePlanDetails do
+  use Ecto.Migration
+
+  def change do
+    create table(:plan_details, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+      add :sort, :integer
+      add :task_id, references(:tasks, on_delete: :nothing, type: :binary_id)
+      add :plan_id, references(:plans, on_delete: :nothing, type: :binary_id)
+
+      timestamps()
+    end
+
+    create index(:plan_details, [:task_id])
+    create index(:plan_details, [:plan_id])
+    create unique_index(:plan_details, [:task_id, :plan_id])
+  end
+end