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class InvalidationLog extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
    {
        $context = $object->getContext();
        $stackTrace....
= $context['stack_trace'];          $stackTraceId = $this->stacktraceResourceModel->getStackTraceId($stackTrace);
         unset($context['stack_trace']);
.....
        $object->setContext(json_encode($context));
        $object->setStacktraceId($stackTraceId);

        return parent::_beforeSave($object);
    }
}