I would like to write a daemon (probably in Node.js) that is able to add rows to arbitrary users Office 365 Excel Workbooks over a long period of time. I have been studying the Microsoft Graph documentation and have a pretty good idea of how to add an application and let users give that application access to their files.
My problem is that from what I read in the Graph documentation (https://learn.microsoft.com/en-us/graph/auth-v2-user?tabs=http) access always expires after max 90 days.