change migrations so they can be roll backed

Up to 20210416051708, which is the latest diff between akkoma and pleroma

priv/repo/migrations/20210416051708_remove_mastofe_settings_from_users.exs

@@ -5,9 +5,15 @@
 defmodule Pleroma.Repo.Migrations.RemoveMastofeSettingsFromUsers do
   use Ecto.Migration
 
-  def change do
+  def up do
     alter table(:users) do
       remove_if_exists(:mastofe_settings, :map)
     end
   end
+
+  def down do
+    alter table(:users) do
+      add_if_not_exists(:mastofe_settings, :map, default: nil)
+    end
+  end
 end

priv/repo/migrations/20211125110126_force_pinned_objects_to_exist.exs

@@ -5,11 +5,19 @@
 defmodule Pleroma.Repo.Migrations.ForcePinnedObjectsToExist do
   use Ecto.Migration
 
-  def change do
+  def up do
     execute("UPDATE users SET pinned_objects = '{}' WHERE pinned_objects IS NULL")
 
     alter table("users") do
       modify(:pinned_objects, :map, null: false, default: %{})
     end
   end
+
+  def down do
+    alter table("users") do
+      modify(:pinned_objects, :map, null: true, default: nil)
+    end
+    
+    execute("UPDATE users SET pinned_objects = NULL WHERE pinned_objects = '{}'")
+  end
 end

priv/repo/migrations/20220116183110_add_birthday_to_users.exs

@@ -5,7 +5,7 @@
 defmodule Pleroma.Repo.Migrations.AddBirthdayToUsers do
   use Ecto.Migration
 
-  def change do
+  def up do
     alter table(:users) do
       add_if_not_exists(:birthday, :date)
       add_if_not_exists(:show_birthday, :boolean, default: false, null: false)
@@ -13,4 +13,13 @@ def change do
 
     create_if_not_exists(index(:users, [:show_birthday]))
   end
+
+  def down do
+    drop_if_exists(index(:users, [:show_birthday]))
+    
+    alter table(:users) do
+      remove_if_exists(:birthday, :date)
+      remove_if_exists(:show_birthday, :boolean)
+    end
+  end
 end

priv/repo/migrations/20220302013920_add_language_to_users.exs

@@ -1,9 +1,15 @@
 defmodule Pleroma.Repo.Migrations.AddLanguageToUsers do
   use Ecto.Migration
 
-  def change do
+  def up do
     alter table(:users) do
       add_if_not_exists(:language, :string)
     end
   end
+
+  def down do
+    alter table(:users) do
+      remove_if_exists(:language, :string)
+    end
+  end
 end

priv/repo/migrations/20220616163503_add_expires_at_to_user_relationships.exs

@@ -5,9 +5,15 @@
 defmodule Pleroma.Repo.Migrations.AddExpiresAtToUserRelationships do
   use Ecto.Migration
 
-  def change do
+  def up do
     alter table(:user_relationships) do
       add_if_not_exists(:expires_at, :utc_datetime)
     end
   end
+
+  def down do
+    alter table(:user_relationships) do
+      remove_if_exists(:expires_at, :utc_datetime)
+    end
+  end
 end