for a student project/movement page set up with Kirby I would like to have a sub page where people could support the proposal of the student project. I could use online petition pages like change.org or campact but I would prefer an own solution.
Sending validation emails with tokens (otherwise anyone can create fake supporters, by the dozen), and managing both unconfirmed entries and confirmation of entries.
Using a database, because if you store the entries and their status to a Kirby page, if you have concurrent read-then-update-then-save-to-disk operations you are going to lose or overwrite some entries.
If you expect to only have a few entries per hour at most, maybe you can skip the database part and write to a page, but that’s not ideal.
Anyway, Kirby doesn’t particularly help you with any of those two needs. It does provide a few low-level tools for talking to a database or sending emails, but they’re minimal and you will have to write a lot of custom PHP code anyway.
My advice would be to look for open source petition software, I’m pretty sure there are a few options out there, and you control the data and avoid asking people to surrender their privacy to questionable actors such as change.org.
Or, if you intend to develop your own (because the open-source options are bad or a bad fit for your needs maybe), you will need average developer skills and might want to work with a framework such as Laravel or Symfony (on the PHP side, there are other options for Python, Ruby or Node).