Hi Ludek,
So we decided to wait if there will be one of them proved by a time
and requested by more users.
Four years on, and Sequelize is working on its 7th release now and currently enjoys 1.3M downloads per week according to npm.
Meanwhile, Doctrine shows 3.5M over an entire month, according to packagist.
Perhaps now is a good time to revisit this request. I rarely develop in PHP now, so Skipper has little value for me with its current feature set.