Google Docs script to find the last active-ish row in a table

Code.gs

function onOpen() {
  // get the proparties we need to work with
  var doc = DocumentApp.getActiveDocument();
  var body = doc.getBody();
  var tables = body.getTables();
  
  // find the last table [since there's more than one somehow]
  var table = tables[tables.length - 1];
  var rows = table.getNumRows();
  
  // this will approach rows - 1 as more of the table is filled in. totally arbitrary right now.
  // TODO: or, find a way to get the first empty row.
  var lastRow = table.getRow(rows - rows/4);
  // for some reason with newPosition, you have to trainwreck the call from DocumentApp otherwise the compiler complains
  // *shrug*
  var position = DocumentApp.getActiveDocument().newPosition(lastRow, body.getNumChildren());
  doc.setCursor(position);
}