Notification: Change type of type to an enum.

priv/repo/migrations/20200606105430_change_type_to_enum_for_notifications.exs

@@ -0,0 +1,36 @@
+defmodule Pleroma.Repo.Migrations.ChangeTypeToEnumForNotifications do
+  use Ecto.Migration
+
+  def up do
+    """
+    create type notification_type as enum (
+      'follow',
+      'follow_request',
+      'mention',
+      'move',
+      'pleroma:emoji_reaction',
+      'pleroma:chat_mention',
+      'reblog',
+      'favourite'
+    )
+    """
+    |> execute()
+
+    """
+    alter table notifications 
+    alter column type type notification_type using (type::notification_type)
+    """
+    |> execute()
+  end
+
+  def down do
+    alter table(:notifications) do
+      modify(:type, :string)
+    end
+
+    """
+    drop type notification_type
+    """
+    |> execute()
+  end
+end