I just finished making a site, it has multiple ways emails are stored, I made a n8n workflow that gets the stored emails, checks if it has not been added onto a spreadsheet before, deduplicates it, then adds it to a spreadsheet. This workflow runs anytime a new email is submitted. This is my first time using n8n, is this dangerous? in the sense that having a n8n workflow that can be triggered directly by users, can it cause massive usage spikes in memory, etc very easily when its dependent on what a user can do? even if i ratelimit it, because I dont know the overhead n8n has, it takes a minute for the workload to finish also.
If you are asking whether you should expose n8n to the public or if you gave your friend access, yes i would definitely classify that as dangerous. In your case, user submits email and something happens. As @frongt@lemmy.zip said, a user could submit any number of things via email that could/would cause issues.