A feedback board you own.
Make a board, hand out its address, and every thread and reply lands in your own table. A person who writes to you never signs in: the page carries a Turnstile challenge, and nothing appears until you approve it (or immediately, if you choose that).
Three tables
board, thread, comment. That is the whole data model: no framework, no Postgres, no second identity store.
Moderation first
Anonymous posts wait in a queue by default; an owner can publish at once, hide a post, or close a thread.
One account's rows
Every row carries
account_id and every query is scoped through it — a board of another account does not exist for you.
What a visitor does
Opens https://zpe.vc/feedback/b/<public-id>, writes a thread, answers the
challenge. No account, no password, no cookie.