I have and .xlsx spreadsheet I converted to .csv that has a list of internal ids for contacts that want to opt out. I created a custom field and put it in the primary/main body of the contact form. I'm not sure how to proceed. A mass update seems like overkill and I'm not sure about passing parameters since the internal ids of all contacts will be passed by default. A suitelet might run out of governance since there are about a thousand records. Suggestion for script type?