Merge branch 'refactor/db-not-null-constraints-for-notifications' into 'develop'

Add NOT NULL constraints for notifications table

See merge request pleroma/pleroma!1900

priv/repo/migrations/20191026191249_set_not_null_for_notifications.exs

@@ -0,0 +1,17 @@
+defmodule Pleroma.Repo.Migrations.SetNotNullForNotifications do
+  use Ecto.Migration
+
+  # modify/3 function will require index recreation, so using execute/1 instead
+
+  def up do
+    execute("ALTER TABLE notifications
+    ALTER COLUMN user_id SET NOT NULL,
+    ALTER COLUMN seen SET NOT NULL")
+  end
+
+  def down do
+    execute("ALTER TABLE notifications
+    ALTER COLUMN user_id DROP NOT NULL,
+    ALTER COLUMN seen DROP NOT NULL")
+  end
+end