This piece of code takes forever to load `RegisterCode.find { RegisterCodes.chatId eq chatId }.empty()`. This is the RegisterCode class: 
`object RegisterCodes : IntIdTable() {
    val chatId = varchar("chat_id", 255).uniqueIndex()
    val registerCode = varchar("registercode", 5)
    val tries = integer("tries")
}

class RegisterCode(id: EntityID<Int>) : IntEntity(id) {
    companion object : IntEntityClass<RegisterCode>(RegisterCodes)
    
    var chatId by RegisterCodes.chatId
    var registerCode by RegisterCodes.registerCode
    var tries by RegisterCodes.tries
}`