"Remove posts from other posters" on a Discord source with an "Only posts by"
list previews what goes, per poster, then deletes it behind a typed token:
- posts whose record names a poster not on the list (by id, username or
display name); posts that record no poster are left alone and counted;
- images found only on those posts; one also on a kept post stays, and a
synthetic drop's link never keeps one;
- their attachments, and every drop that absorbed one of them, so the grouping
sweep regroups what remains.
Preview and apply share one predicate, and a parity test holds them to it.
The post record now also saves the poster's display name.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
