how to do database transactions with strapi

      await strapi.connections.default.transaction(async (transacting) => {

        mediaFile = await strapi.services['media-file'].getOrCreate(
          { md5 },
          mediaFileData,
          { transacting }
        );

        const clip = await strapi.services.clip.findOne({ id }, null, {
          transacting,
        });

        await strapi.services.clip.update(
          { id },
          {
            mediaFiles: _.uniq([...clip.mediaFiles, mediaFile.id]),
          },
          { transacting }
        );
      });