public function getLastForPhoneNumber($userId, $phoneNumber)
{
$sql = 'SELECT MAX(int_date) as mx FROM ' . '*PREFIX*ocsms_conversation_read_states WHERE user_id = ? AND phone_number = ?';
$query = \OCP\DB::prepare($sql);
$result = $query->execute(array($userId, $phoneNumber));
if ($row = $result->fetchRow()) {
return $row["mx"];
}
return 0;
}