@hypolite From my point of view the data model is mostly complete. For the first part we will only need one more boolean field to close the report. This can be extended in later versions with the possibility to reject and to accept the report, including the storing of the moderator's uid.

And on the frontend all that we need is a report button on a user and on a post, then the user can enter some remarks. Also there needs to be a button if the report should be forwarded to the server of the reported account.