traxxx/migrations/20211030162955_entity_scenes.js

exports.up = async (knex) => knex.raw(`
	CREATE FUNCTION entities_scenes(entity entities) RETURNS SETOF releases AS $$
		WITH RECURSIVE children AS (
			SELECT entities.id
				FROM entities
				WHERE entities.id = entity.id

				UNION ALL

				SELECT entities.id
				FROM entities
				INNER JOIN children ON children.id = entities.parent_id
		)

		SELECT releases FROM releases
		INNER JOIN children ON children.id = releases.entity_id;
	$$ LANGUAGE SQL STABLE;

	COMMENT ON FUNCTION entities_scenes IS E'@sortable';
`);

exports.down = async (knex) => knex.raw(`
	DROP FUNCTION IF EXISTS entities_scenes;
`);