The following does not work:

object MySchema extends Schema {
   class Record extends KeyedEntity[Int] {
      val id = 0
      val data :Array[Byte]
   }
   val records = table[Record]

   def updateData (id :Int, data :Array[Byte]) = {
     records.update(r => where(r.id === id) set(r.data := data))
   }
}

because there's no byteArray2ScalarByteArray implicit in DslFactory. I presume one should exist.